[Objectives]This study was conducted to investigate the effects of Astragalus membranaceus in different groups on energy metabolism and CNTF protein expression in skeletal muscle of exercise-induced fatigue rats.[Meth...[Objectives]This study was conducted to investigate the effects of Astragalus membranaceus in different groups on energy metabolism and CNTF protein expression in skeletal muscle of exercise-induced fatigue rats.[Methods]Thirty-five clean male SD rats were randomly divided into a normal group,and low-,meddle-and high-dose groups of A.membranaceus aqueous solution,with 7 rats in each group.The low-dose,medium-dose and high-dose groups were given by gavage at 0.65,1.3 and 2.6 g/kg,respectively,while the normal group and the model group were given normal food and water.The weight of rats was observed.The contents of serum urea,lactate,muscle glycogen,liver glycogen and CNTF expression were detected.[Results]After modeling,compared with the normal group,the serum lactate and urea contents of rats in the model group significantly increased(P<0.01),while the muscle glycogen content(P<0.01)and liver glycogen content(P<0.05)of the skeletal muscle significantly decreased.Compared with the model group,the low-,meddle-and high-dose groups of A.membranaceus significantly reduced the levels of lactate and urea in serum(P<0.01),while the levels of muscle glycogen and liver glycogen in the skeletal muscle significantly increased(P<0.01,P<0.05).[Conclusions]This study provides a good research foundation for the treatment of exercise-induced fatigue using traditional Chinese herb A.membranaceus in modern clinical practice.展开更多
To explore the mechanisms underlying exercise-induced local muscle fatigue in patients with idiopathic Parkinson's disease (PD),we used surface electromyography to record myoelectric signals from the tibialis anter...To explore the mechanisms underlying exercise-induced local muscle fatigue in patients with idiopathic Parkinson's disease (PD),we used surface electromyography to record myoelectric signals from the tibialis anterior muscle during isometric contraction-induced fatigue until exhaustion.The results revealed no significant differences between patients with idiopathic PD and healthy controls in maximum voluntary contraction of the tibialis anterior muscle.The basic characteristics of surface electromyography were also similar between the two groups.The duration of isometric contraction at 50% maximum voluntary contraction was shortened in PD patients.In addition,PD patients exhibited a stronger increase in mean square amplitude,but a weaker decrease in median frequency and mean power frequency compared with healthy controls during isometric contraction.The skeletal muscles of PD patients revealed specificity of surface electromyography findings,indicating increased fatigability compared with healthy controls.展开更多
Objective This study aimed to investigate the effect and underlying mechanism of Fructus lycii in improving exercise fatigue.Methods A network pharmacological approach was used to explore potential mechanisms of actio...Objective This study aimed to investigate the effect and underlying mechanism of Fructus lycii in improving exercise fatigue.Methods A network pharmacological approach was used to explore potential mechanisms of action of Fructus lycii.Skeletal muscle C2C12 cells and immunofluorescence were employed to verify the effect and mechanism of the representative components in Fructus lycii predicted by network pharmacological analysis.Results Six potential active components,namely quercetin,β-sitosterol,stigmasterol,7-Omethylluteolin-6-C-beta-glucoside_qt,atropine,and glycitein,were identified to have potency in improving exercise fatigue via multiple pathways,such as the PI3K-Akt,neuroactive ligand-receptor interaction,IL-17,TNF,and MAPK signaling pathways.The immunofluorescence results indicated that quercetin,a significant active component in Fructus lycii,increased the mean staining area of 2-NBDG,TMRM,and MitoTracker,and decreased the area of CellRox compared to the control.Furthermore,the protein expression levels of p-38 MAPK,p-MAPK,p-JNK,p-PI3K,and p-AKT markedly increased after quercetin treatment.Conclusion Fructus lycii might alleviate exercise fatigue through multiple components and pathways.Among these,quercetin appears to improve exercise fatigue by enhancing energy metabolism and reducing oxidative stress.The PI3K-AKT and MAPK signaling pathways also appear to play a role in this process.展开更多
Accurate detection of exercise fatigue based on physiological signals is vital for reason-able physical activity.As a non-invasive technology,phonocardiogram(PCG)signals possess arobust capability to reflect cardiovas...Accurate detection of exercise fatigue based on physiological signals is vital for reason-able physical activity.As a non-invasive technology,phonocardiogram(PCG)signals possess arobust capability to reflect cardiovascular information,and their data acquisition devices are quiteconvenient.In this study,a novel hybrid approach of fractional Fourier transform(FRFT)com-bined with linear and discrete wavelet transform(DWT)features extracted from PCG is proposedfor PCG multi-class classification.The proposed system enhances the fatigue detection performanceby combining optimized FRFT features with an effective aggregation of linear features and DWTfeatures.The FRFT technique is employed to convert the 1-D PCG signal into 2-D image which issent to a pre-trained convolutional neural network structure,called VGG-16.The features from theVGG-16 were concatenated with the linear and DWT features to form fused features.The fusedfeatures are sent to support vector machine(SVM)to distinguish six distinct fatigue levels.Experi-mental results demonstrate that the proposed fused features outperform other feature combinationssignificantly.展开更多
[Objectives]To investigate the effect of exercise therapy in gastric cancer patients during perioperative period.[Methods]100 patients with gastric cancer who underwent elective operation in the Department of Gastroin...[Objectives]To investigate the effect of exercise therapy in gastric cancer patients during perioperative period.[Methods]100 patients with gastric cancer who underwent elective operation in the Department of Gastrointestinal Surgery of Taihe Hospital Affiliated to Hubei University of Medicine were divided into observation group and control group by convenience sampling.The control group received routine nursing measures,and the experimental group received exercise therapy intervention measures on the basis of the control group.The patients were evaluated by the General Information Questionnaire,Self-Rating Anxiety Scale,Self-Rating Depression Scale and Cancer-related Fatigue Scale at the time of admission,the second week and the sixth week after operation.[Results]The time effect,intervention effect and interaction effect of anxiety score,depression score and cancer-related fatigue score were significant(all P<0.05)and the index of enhanced recovery after surgery was significant(P<0.05)in the two groups at the second and sixth week after operation.[Conclusions]Exercise therapy is beneficial to promoting the enhanced recovery after surgery in advance,reduce cancer-related fatigue,negative emotion and accelerate rehabilitation in patients with gastrointestinal tumors.展开更多
Exercise fatigue is a physiological phenomenon where the body cannot maintain a specific level after being stimulated by excessive exercise.Its five main theories include“energy depletion”,“accumulation of metaboli...Exercise fatigue is a physiological phenomenon where the body cannot maintain a specific level after being stimulated by excessive exercise.Its five main theories include“energy depletion”,“accumulation of metabolites”,“homeostasis disorder of the internal environment”,“free radicals”,and“central nervous system protection inhibition”.The imbalance of intestinal flora caused by vigorous exercise can further lead to fatigue.Therefore,maintaining healthy intestinal flora is crucial for athlete health and performance.Recent studies have demonstrated that probiotics can regulate intestinal flora and alleviate exercise fatigue;however,there are no systematic reviews on the anti-fatigue effects of probiotics.Based on the mechanisms of exercise-induced fatigue,this article summarizes the effects and mechanisms by which probiotics combat exercise fatigue,aiming to provide research ideas for the development of probiotics that prevent exercise fatigue.展开更多
Objective:This study aimed to determine the effect of the relaxation breathing exercise(RBE)on fatigue and cortisol levels among Indonesian women with gynecological cancer undergoing chemotherapy.Methods:This pilot st...Objective:This study aimed to determine the effect of the relaxation breathing exercise(RBE)on fatigue and cortisol levels among Indonesian women with gynecological cancer undergoing chemotherapy.Methods:This pilot study consecutively recruited 44 gynecological cancer patients to receive RBE(22)or usual care(22).Cortisol level was measured before and after completion of the intervention(day 8).Fatigue was measured using the Piper Fatigue Scale(PFS).Anxiety and depression were assessed using the Hospital Anxiety and Depression Scale(HADS)at the baseline days of the study for days 1,4,and 8.The obtained data were analyzed using Fisher’s exact test,the independent t-test,and the Mann-Whitney U test.Results:There were significant increases in cortisol levels within the groups,either the intervention or control groups,respectively(P-value=0.0003 and 0.001).Despite there being no statistical significance between the intervention and control groups,there were noticeable differences in the cortisol levels,indicating the extreme increase in cortisol levels in the control group(Median[IQR1-IQR3]:2.30[0.99-9.09];Min-Max:0.43-23.38)compared with the intervention group(Median[IQR1-IQR3]=2.97[1.26-5.18];Min-Max=0.39-6.91).Conclusions:RBE helps prevent a significant increase in cortisol levels that can alleviate fatigue for women with gynecological cancer.Further research was recommended to compare several intervention modalities for fatigue and cancer-related symptom management based on cortisol level changes.展开更多
Objective:To evaluate the intervention effects of seated Baduanjin exercise on patients undergoing maintenance hemodialysis(MHD).Methods:A total of 108 MHD patients admitted between July 2022 and July 2023 were select...Objective:To evaluate the intervention effects of seated Baduanjin exercise on patients undergoing maintenance hemodialysis(MHD).Methods:A total of 108 MHD patients admitted between July 2022 and July 2023 were selected.They were randomly assigned into two groups:the experimental group,with 55 patients,who received seated Baduanjin exercise combined with leg exercises during dialysis;and the control group,with 53 patients,who only performed leg exercises during dialysis.The psychological state,fatigue symptoms,quality of life,and sleep quality scores were compared between the two groups,and exercise endurance was recorded.Results:After the intervention,the psychological state scores in the experimental group were lower than those in the control group,the fatigue symptom scores were lower,the quality of life scores were higher,the sleep quality scores were lower,and the exercise endurance was higher(P<0.05).Conclusion:Seated Baduanjin exercise can improve the negative psychological state and fatigue symptoms of MHD patients,enhance their quality of life and sleep quality,and effectively increase their exercise endurance.展开更多
This study examined the effects of exercise on behavior and peripheral blood leukocyte apoptosis in a rat model of chronic fatigue syndrome (CFS). Thirty-six healthy male Sprague-Dawley rats were equally randomized ...This study examined the effects of exercise on behavior and peripheral blood leukocyte apoptosis in a rat model of chronic fatigue syndrome (CFS). Thirty-six healthy male Sprague-Dawley rats were equally randomized into 3 groups: the control group, CFS model group and the exercise group in terms of body weight. A total of 25 rats entered the final statistical analysis due to 11 deaths during the study. CFS model was established by subjecting the rats in CFS model group and exercise group to electric shock, chronic restraint stress and cold water swim. Besides, rats in the exercise group took rtmning wheel exercise. After a week of conditioning feeding, model construction and running wheel exercise were performed simultaneously, and lasted for 23 consecutive days. The behavior experiments, including running wheel exercise, open-field test, tail suspension test and Morris water maze test, were conducted, either before or after the model establishment. Rats were sacrificed and peripheral blood was obtained for the assessment of lymphocyte apoptosis index by flow cytometry (FCM). It was found that as compared with those in the control group, the weight of the rats was decreased obviously (P〈0.01), the mobility time in the open-field and the tail suspension tests was shortened significantly (P〈0.01), the time to locate the platform was enhanced (P〈0.01) and the cell apoptosis index was increased substantially (P〈0.01) in the CSF model group. Meanwhile, in comparison to the model group, the behavior in the open-field and the tail suspension tests was improved significantly (P〈0.05), and the apoptosis index decreased remarkably (P〈0.01) in the exercise group. It is concluded that sport intervention can prevent lymphocyte apoptosis and improve animal behavior rather than the memory.展开更多
Objective To gain insight on how exercise affects the outcomes of prostate cancer patients treated with androgen deprivation therapy,specifically cancer-related fatigue(CRF) and quality of life(QoL). Methods Systemati...Objective To gain insight on how exercise affects the outcomes of prostate cancer patients treated with androgen deprivation therapy,specifically cancer-related fatigue(CRF) and quality of life(QoL). Methods Systematic searches for randomized clinical trials(RCTs) evaluating the effects of exercise on CRF and QoL of prostate cancer patients receiving androgen deprivation therapy were carried out to identify the eligible studies from EMBASE,Pub Med and Cochrane library. Related data were extracted from eligible studies and then subjected to Reviewer Manage 5.3 for analysis. Standardized mean differences(SMD) and its 95% confidence interval(CI) were calculated. Results In all,10 RCTs involving 841 prostate cancer patients(448 of whom exercised and 393 did not) were included in this study. With respect to CRF,there was good consistency among different studies,and it was remarkably reduced in the exercise group(SMD=-0.32,95% CI:-0.45 to-0.18,P<0.00001,n=784). In regards to QoL,there was also good consistency among different studies,and it was also improved significantly in the exercise group(SMD=0.21,95% CI:0.08 to 0.34,P=0.002,n=841). Conclusion Exercise both reduced CRF and improved QoL in prostate cancer patients receiving androgen deprivation therapy.展开更多
Objective:To evaluate evidence from published systematic reviews about the effectiveness of exercise interventions on fatigue management in breast cancer patients.Methods:PubMed,Web of Science,the Cochrane Library,the...Objective:To evaluate evidence from published systematic reviews about the effectiveness of exercise interventions on fatigue management in breast cancer patients.Methods:PubMed,Web of Science,the Cochrane Library,the Cumulative Index of Nursing and Allied Health(CINAHL),Embase databases,the China National Knowledge Infrastructure(CNKI),the Wanfang database,the China Biomedical Literature Database(CBM),and the VIP database were searched to identify relevant systematic reviews.The reviews which assessed exercise interventions on cancer-related fatigue(CRF)in breast cancer patients were included.Quality of evidence was evaluated by the Grade of Recommendation,Assessment,Development,and Evaluation(GRADE)tool.The Assessment of Multiple Systematic Reviews(AMSTAR)appraisal tool was used to evaluate the methodological quality of included systematic reviews.Results:Twenty-four systematic reviews met all the inclusion criteria.The overall mean score for AMSATR is 7.38 and ranged from 4 to 10 points.In addition,21 reviews arrived at positive conclusions,which exercises could reduce CRF,and 3 obtained that exercise does not affect fatigue.As for GRADE,8 of the reviews were graded as'moderate',2 of the studies were'very low',and the others were'low'.Conclusions:Aerobic and resistance exercise can be regarded as beneficial to CRF in breast cancer patients,and limited evidence exists that yoga had an effect on reducing fatigue.The quality of the current systematic review is still far from satisfactory.展开更多
Purpose: This study examined the possible causal mechanisms of fatigue during intense exercise in the heat in a group of nine sedentary women. Methods: Two strenuous cycling sessions were performed, at 100% of maximal...Purpose: This study examined the possible causal mechanisms of fatigue during intense exercise in the heat in a group of nine sedentary women. Methods: Two strenuous cycling sessions were performed, at 100% of maximal aerobic power, either in neutral (N-Ex, air temperature: 22°C ± 0.4°C, air humidity: 53% ± 8%) or in heat conditions (H-Ex, air temperature: 35°C ± 0.3°C, air humidity: 59 ± 6). Tympanic temperature (Tty), heart rate (HR), body mass loss (BML), lactate concentration [La] and brain electrical activity (EEG: α and β waves and α/β ratio) were recorded. Results: Tty, HR and [La] increases (p ﹣1) than that during N-Ex (0.08 ± 0.02°C·min﹣1), and time to exhaustion (Time Limit at 100%) was significantly (p β waves decreased (p α/β ratio increased (p < 0.05) significantly immediately before exhaustion. Conclusion: During exercise in the heat, the high rate of core temperature rising might be a critical factor triggering faster brain changes.展开更多
This study aimed to examine the influence of exercise habits and physical fitness level on subjective fatigue symptoms (SFS) in adolescent students. Four hundred and one healthy young male adults (age: 16.5 +/- 1.2 yr...This study aimed to examine the influence of exercise habits and physical fitness level on subjective fatigue symptoms (SFS) in adolescent students. Four hundred and one healthy young male adults (age: 16.5 +/- 1.2 yr) participated in the physical fitness test of the Ministry of Education, Culture, Sports, Science and Technology in Japan and responded to the questionnaire on exercise habits and SFS. SFS questionnaire was conducted 6 times with a week interval during the physical fitness test. SFS was compared among groups with different physical fitness levels and exercise habit. Significant differences were found in difficulty with concentrated thinking, languor and low vigor, with the high physical fitness group having lower values of the three fatigue factors than the low physical fitness group regardless of affiliation with sports club and gyms, exercise frequency and time. SFS is largely affected by physical fitness level but very little by exercise habits.展开更多
Purpose:This study aimed to determine the effectiveness of Relaxation Breathing Exercise(RBE)on fatigue in patients with gynaecological cancer undergoing chemotherapy.Methods:We used a quasi-experiment with pre-and po...Purpose:This study aimed to determine the effectiveness of Relaxation Breathing Exercise(RBE)on fatigue in patients with gynaecological cancer undergoing chemotherapy.Methods:We used a quasi-experiment with pre-and post-test design.Forty-two patients were consecutively sampled,21 of whom were assigned to the group receiving RBE four times a day and 21 to the group receiving RBE twice a day.Fatigue scores were measured every day for 7 days for both groups using the Piper Fatigue Scale.Data obtained were analysed using repeated-ANOVA and independent ttest with a significant level of a<0.01.Results:We found a significant decrease(P<0.01)in the mean fatigue scores of both groups(four times RBE in a day group=3.29±0.59 and twice RBE in a day group=4.19±0.61)after the completion of the intervention.However,the four times RBE a day group showed larger decrease on fatigue scores than the twice RBE a day group did(Mean Difference=0.91;99%CI=0.41 to 1.41;P=0.001).Conclusion:Conducting RBE four times a day effectively alleviated fatigue better than RBE twice a day on gynaecological cancer patients undergoing chemotherapy.展开更多
Chronic fatigue syndrome and myalgic encephalomyelitis (CFS/ME) are, amongst others, characterized by exercise intolerance, pain, post exertional malaise and orthostatic intolerance. It has been shown in venous diseas...Chronic fatigue syndrome and myalgic encephalomyelitis (CFS/ME) are, amongst others, characterized by exercise intolerance, pain, post exertional malaise and orthostatic intolerance. It has been shown in venous disease and sport participation that compression stockings may improve exercise performance and reduce post exercise muscle soreness. Moreover, its use is advocated in orthostatic hypotension. Therefore, it was hypothesized that compression stockings may reduce symptomatology in CFS/ME patients. Methods: 100 patients used compression stockings class II for minimally 3 weeks and thereafter filled in a questionnaire, based on the Rand 36 physical activity questions (n = 9), whether compression stockings changed perceived symptoms or not. Moreover, 7 questions referring to prolonged standing and sitting, to recovery post exercise, muscle pain during or immediately post exercise, and to dizziness/light-headedness during or immediately post exercise, while standing and during prolonged sitting were added. Questions were scored as 1: able to perform activity much less while wearing the stockings, 2: perform activity somewhat less, 3: no perceived change in activity, 4: perform activity slightly better, 5: able to perform activity much better while wearing the stockings. Results: In patients able to answer the question, all mean scores per activity were significantly higher than 3, being no perceived change in activity while wearing the stockings. Subgroup analysis showed that patients with orthostatic intolerance reported higher effects than patients without orthostatic intolerance. Conclusion: This pilot study suggests that compression stockings may be useful to reduce symptomatology of physical activities in CFS/ME patients, especially in patients with orthostatic intolerance. Larger prospective studies with hard endpoints are warranted.展开更多
Physical exercise is a good means of enhancing and maintaining health. However, many people struggle to make exercise be a habit, in part because of the associated fatigue. The present study investigated the effects o...Physical exercise is a good means of enhancing and maintaining health. However, many people struggle to make exercise be a habit, in part because of the associated fatigue. The present study investigated the effects of tomato juice on fatigue induced by exercise in humans and mice. A study of 10 healthy men and women indicated that drinking tomato juice suppressed post-exercise increases in rated perceived exertion, a subjective fatigue indicator. In mice, a single administration of tomato juice significantly attenuated exercise-induced fatigue, as measured by locomotor activity and blood transforming growth factor β and corticosterone levels. The active substances in tomatoes, which were among the aqueous components as of tomato juice supernatant, showed the same anti-fatigue effects as whole tomato juice. Moreover, these effects were mimicked by water supplemented with the aqueous components (i.e., sugars, organic acids, and amino acids) and were likely exerted by two or more of these components. Our results suggest that consuming tomato juice prior to or during an exercise session can reduce post-exercise fatigue, which could encourage more individuals to incorporate a regular exercise regimen into their daily routine.展开更多
Objective:To evaluate the anti-fatigue effects of different extracts from Cistanche tubulosa(Schenk)Wight(C.tubulosa,Rou Cong Rong),focusing on central and exercise-induced fatigue in mice.This study investigated the ...Objective:To evaluate the anti-fatigue effects of different extracts from Cistanche tubulosa(Schenk)Wight(C.tubulosa,Rou Cong Rong),focusing on central and exercise-induced fatigue in mice.This study investigated the pharmacological effects of the total oligosaccharides,polysaccharides,and phenylethanoid glycosides(CPhGs)extracted from C.tubulosa.Methods: Models of sleep deprivation and forced swimming fatigue were established to simulate central and exercise-induced fatigue.The mice were treated with different extracts of C.tubulosa,and their effects were assessed using behavioral tests to measure exercise capacity,learning,and memory function.Biochemical analyses were performed to evaluate the changes in serum and brain neurotransmitter levels,liver and muscle glycogen storage,and various fatigue-related biomarkers.Results: This study found that treatment with C.tubulosa extract improved exercise capacity,learning,and memory in mice.Total oligosaccharides from C.tubulosa enhanced adrenocorticotropic hormone,cholinesterase,and thyroid-stimulating hormone levels,reduced cortisol levels in central fatigue models,and ameliorated biochemical markers of exercise-induced fatigue,including lowering lactic acid,blood urea nitrogen,and malondialdehyde levels.Among the tested extracts,the total oligosaccharides showed the most comprehensive anti-fatigue effects.Conclusion: The anti-fatigue effects of C.tubulosa,particularly those of its total oligosaccharides,are pronounced in both central and exercise-induced fatigue.These effects are mediated by the regulation of neurotransmitter levels,enhancement of glycogen storage,and improvement of antioxidant enzyme activity,suggesting potential therapeutic benefits in fatigue-related conditions.展开更多
Objective:To investigate the effect of moxibustion at Shenque(CV 8)on fatigue in rats with chronic exercise-induced exhaustion.Methods:Thirty male Sprague-Dawley(SD)rats were randomly divided into a blank group,a mode...Objective:To investigate the effect of moxibustion at Shenque(CV 8)on fatigue in rats with chronic exercise-induced exhaustion.Methods:Thirty male Sprague-Dawley(SD)rats were randomly divided into a blank group,a model group and a moxibustion group,10 rats in each group.Except rats in the blank group,the remaining rats were subjected to create long-term exhaustion models by repeated swimming.After successful modeling,rats in the moxibustion group received mild moxibustion at Shenque(CV 8)for 15 min,once every other day with a total of 10 times.Rats in the model group and the blank group did not receive moxibustion.At the end of the treatment,the exhausted times,and the body weight of rats before and after the experiment were compared among groups.The levels of blood malondialdehyde(MDA)and urea nitrogen(BUN),as well as the activities of aspartate transarninase(AST),alanine aminotransferase(ALT)and lactate dehydrogenase(LDH)were also measured by the automatic biochemical analyzer,24 h after the exhausting excise.Results:The 10 th swimming time was significantly longer in the moxibustion group than that in the model group(P〈0.01).The increase rate of the body weight was lower in the rats of the moxibustion group than that in the model group before the 7 th and the 10 th exhausting excise(P〈0.05,P〈0.01).The levels of serum MDA and BUN,as well as the activities of AST,ALT and LDH in the model group were higher than those in the blank group(all P〈0.01).The levels of serum MDA and BUN,as well as the activities of AST,ALT and LDH in the moxibustion group were lower than those in the model group(P〈0.01).Conclusion:Moxibustion at Shenque(CV 8)can decrease the serum levels of MDA and BUN,as well as activities of AST,ALT and LDH in the long-term fatigue rats,thus to improve the symptoms of fatigue.展开更多
Purpose: This study aimed to explore neuromuscular fatigue and recovery profiles im individuals with intellectual disability(ID) after exhausting submaximal contraction.Methods: Ten men with ID were compared to 10 men...Purpose: This study aimed to explore neuromuscular fatigue and recovery profiles im individuals with intellectual disability(ID) after exhausting submaximal contraction.Methods: Ten men with ID were compared to 10 men without ID. The evaluation of neuromuscular function consisted in brief(3 s) isometric maximal voluntary contraction(IMVC) of the knee extension superimposed with electrical nerve stimulation before, immediately after, and during33 min after an exhausting submaximal isometric task at 15% of the IMVC. Force, voluntary activation level(VAL), potentiated twitch(Ptw), and electromyography(EMG) signals were measured during IMVC and then analyzed.Results: Individuals with ID developed lower baseline IMVC, VAL, Ptw; and RMS/M_(max) ratio(root-mean-square value normalized to the maximal peak-to-peak amplitude of the M-wave) than controls(p < 0.05). Nevertheless, the time to task failure was significantly longer in ID vs. controls(p < 0.05). The 2 groups presented similar IMVC decline and recovery kinetics after the fatiguing exercise. However. individuals with ID presented higher VAL and RMS/M_(max) ratio declines but lower Ptw decline compared to those without ID. Moreover, individuals with ID demonstrated a persistent central fatigue but faster recovery from peripheral fatigue.Conclusion: These differences in neuromuscular fatigue profiles and recovery kinetics should be acknowledged when prescribing training programs for individuals with ID.展开更多
Purpose: The aim of this study was to investigate the influence of different exercise intensities induced by a soccer specific protocol on kicking performance in soccer players.Methods: Twelve semi-professional male s...Purpose: The aim of this study was to investigate the influence of different exercise intensities induced by a soccer specific protocol on kicking performance in soccer players.Methods: Twelve semi-professional male soccer players participated in this study and performed maximal instep kicks before and after the implementation of an exercise protocol to determine the influence of different intensities upon kicking ball velocity and the target-hitting accuracy.Results: Analysis of variance designs with repeated measures showed that maximal ball velocity was affected only after the most intense circuit(F(6, 66) = 2.3; p = 0.041; η2= 0.18), while accuracy was not affected in the protocol(F(6, 66) = 0.19; p = 0.98; η2= 0.02). Low and moderate intensities did not affect accuracy or kicking ball velocity.Conclusion: These findings suggest that kicking ball velocity is influenced by high-exercise intensities. Low and moderate exercise intensities do not affect the performance of the kick, and intensity does not influence accuracy. Otherwise, it is possible that other mechanisms(not only physiological) may influence players during the exercise.展开更多
基金Supported by Undergraduate Innovation and Entrepreneurship Training Program of Guizhou University of Traditional Chinese Medicine(GZYDCHZ[2019]42)National Key R&D Plan(2019YFC1712500)Guizhou Provincial Science and Technology Planning Project(QKHHBZ[2020]3003).
文摘[Objectives]This study was conducted to investigate the effects of Astragalus membranaceus in different groups on energy metabolism and CNTF protein expression in skeletal muscle of exercise-induced fatigue rats.[Methods]Thirty-five clean male SD rats were randomly divided into a normal group,and low-,meddle-and high-dose groups of A.membranaceus aqueous solution,with 7 rats in each group.The low-dose,medium-dose and high-dose groups were given by gavage at 0.65,1.3 and 2.6 g/kg,respectively,while the normal group and the model group were given normal food and water.The weight of rats was observed.The contents of serum urea,lactate,muscle glycogen,liver glycogen and CNTF expression were detected.[Results]After modeling,compared with the normal group,the serum lactate and urea contents of rats in the model group significantly increased(P<0.01),while the muscle glycogen content(P<0.01)and liver glycogen content(P<0.05)of the skeletal muscle significantly decreased.Compared with the model group,the low-,meddle-and high-dose groups of A.membranaceus significantly reduced the levels of lactate and urea in serum(P<0.01),while the levels of muscle glycogen and liver glycogen in the skeletal muscle significantly increased(P<0.01,P<0.05).[Conclusions]This study provides a good research foundation for the treatment of exercise-induced fatigue using traditional Chinese herb A.membranaceus in modern clinical practice.
文摘To explore the mechanisms underlying exercise-induced local muscle fatigue in patients with idiopathic Parkinson's disease (PD),we used surface electromyography to record myoelectric signals from the tibialis anterior muscle during isometric contraction-induced fatigue until exhaustion.The results revealed no significant differences between patients with idiopathic PD and healthy controls in maximum voluntary contraction of the tibialis anterior muscle.The basic characteristics of surface electromyography were also similar between the two groups.The duration of isometric contraction at 50% maximum voluntary contraction was shortened in PD patients.In addition,PD patients exhibited a stronger increase in mean square amplitude,but a weaker decrease in median frequency and mean power frequency compared with healthy controls during isometric contraction.The skeletal muscles of PD patients revealed specificity of surface electromyography findings,indicating increased fatigability compared with healthy controls.
基金funded by China’s National Key R&D Programmers for“Hi-Tech Winter Olympics”Special Project[2020YFF0305001]。
文摘Objective This study aimed to investigate the effect and underlying mechanism of Fructus lycii in improving exercise fatigue.Methods A network pharmacological approach was used to explore potential mechanisms of action of Fructus lycii.Skeletal muscle C2C12 cells and immunofluorescence were employed to verify the effect and mechanism of the representative components in Fructus lycii predicted by network pharmacological analysis.Results Six potential active components,namely quercetin,β-sitosterol,stigmasterol,7-Omethylluteolin-6-C-beta-glucoside_qt,atropine,and glycitein,were identified to have potency in improving exercise fatigue via multiple pathways,such as the PI3K-Akt,neuroactive ligand-receptor interaction,IL-17,TNF,and MAPK signaling pathways.The immunofluorescence results indicated that quercetin,a significant active component in Fructus lycii,increased the mean staining area of 2-NBDG,TMRM,and MitoTracker,and decreased the area of CellRox compared to the control.Furthermore,the protein expression levels of p-38 MAPK,p-MAPK,p-JNK,p-PI3K,and p-AKT markedly increased after quercetin treatment.Conclusion Fructus lycii might alleviate exercise fatigue through multiple components and pathways.Among these,quercetin appears to improve exercise fatigue by enhancing energy metabolism and reducing oxidative stress.The PI3K-AKT and MAPK signaling pathways also appear to play a role in this process.
基金the National Natural Sci-ence Foundation of China(No.62301056)the Fundamental Research Funds for Central Universities(No.2022QN005).
文摘Accurate detection of exercise fatigue based on physiological signals is vital for reason-able physical activity.As a non-invasive technology,phonocardiogram(PCG)signals possess arobust capability to reflect cardiovascular information,and their data acquisition devices are quiteconvenient.In this study,a novel hybrid approach of fractional Fourier transform(FRFT)com-bined with linear and discrete wavelet transform(DWT)features extracted from PCG is proposedfor PCG multi-class classification.The proposed system enhances the fatigue detection performanceby combining optimized FRFT features with an effective aggregation of linear features and DWTfeatures.The FRFT technique is employed to convert the 1-D PCG signal into 2-D image which issent to a pre-trained convolutional neural network structure,called VGG-16.The features from theVGG-16 were concatenated with the linear and DWT features to form fused features.The fusedfeatures are sent to support vector machine(SVM)to distinguish six distinct fatigue levels.Experi-mental results demonstrate that the proposed fused features outperform other feature combinationssignificantly.
文摘[Objectives]To investigate the effect of exercise therapy in gastric cancer patients during perioperative period.[Methods]100 patients with gastric cancer who underwent elective operation in the Department of Gastrointestinal Surgery of Taihe Hospital Affiliated to Hubei University of Medicine were divided into observation group and control group by convenience sampling.The control group received routine nursing measures,and the experimental group received exercise therapy intervention measures on the basis of the control group.The patients were evaluated by the General Information Questionnaire,Self-Rating Anxiety Scale,Self-Rating Depression Scale and Cancer-related Fatigue Scale at the time of admission,the second week and the sixth week after operation.[Results]The time effect,intervention effect and interaction effect of anxiety score,depression score and cancer-related fatigue score were significant(all P<0.05)and the index of enhanced recovery after surgery was significant(P<0.05)in the two groups at the second and sixth week after operation.[Conclusions]Exercise therapy is beneficial to promoting the enhanced recovery after surgery in advance,reduce cancer-related fatigue,negative emotion and accelerate rehabilitation in patients with gastrointestinal tumors.
基金supported by the Sichuan Province Key Research and Development Program(2024YFHZ0077)the Science and Technology Research Program of Chongqing Municipal Education Commission(KJQN202300204)+2 种基金the Major Science and Technology Special Projects in Tibet Autonomous Region(No.XZ202201ZD0001N)the University Innovation Research Group in Chongqing(No.CXQT21007)the Key Construction Disciplines of Traditional Chinese Medicine in Chongqing(2021-4322190044).
文摘Exercise fatigue is a physiological phenomenon where the body cannot maintain a specific level after being stimulated by excessive exercise.Its five main theories include“energy depletion”,“accumulation of metabolites”,“homeostasis disorder of the internal environment”,“free radicals”,and“central nervous system protection inhibition”.The imbalance of intestinal flora caused by vigorous exercise can further lead to fatigue.Therefore,maintaining healthy intestinal flora is crucial for athlete health and performance.Recent studies have demonstrated that probiotics can regulate intestinal flora and alleviate exercise fatigue;however,there are no systematic reviews on the anti-fatigue effects of probiotics.Based on the mechanisms of exercise-induced fatigue,this article summarizes the effects and mechanisms by which probiotics combat exercise fatigue,aiming to provide research ideas for the development of probiotics that prevent exercise fatigue.
基金supported by the Research and Community Services Centre of Hasanuddin University,South Sulawesi Province,Indonesia (No.UH18070408).
文摘Objective:This study aimed to determine the effect of the relaxation breathing exercise(RBE)on fatigue and cortisol levels among Indonesian women with gynecological cancer undergoing chemotherapy.Methods:This pilot study consecutively recruited 44 gynecological cancer patients to receive RBE(22)or usual care(22).Cortisol level was measured before and after completion of the intervention(day 8).Fatigue was measured using the Piper Fatigue Scale(PFS).Anxiety and depression were assessed using the Hospital Anxiety and Depression Scale(HADS)at the baseline days of the study for days 1,4,and 8.The obtained data were analyzed using Fisher’s exact test,the independent t-test,and the Mann-Whitney U test.Results:There were significant increases in cortisol levels within the groups,either the intervention or control groups,respectively(P-value=0.0003 and 0.001).Despite there being no statistical significance between the intervention and control groups,there were noticeable differences in the cortisol levels,indicating the extreme increase in cortisol levels in the control group(Median[IQR1-IQR3]:2.30[0.99-9.09];Min-Max:0.43-23.38)compared with the intervention group(Median[IQR1-IQR3]=2.97[1.26-5.18];Min-Max=0.39-6.91).Conclusions:RBE helps prevent a significant increase in cortisol levels that can alleviate fatigue for women with gynecological cancer.Further research was recommended to compare several intervention modalities for fatigue and cancer-related symptom management based on cortisol level changes.
基金Research Project of Sichuan Nursing Vocational College(Project No.2022RZY38)。
文摘Objective:To evaluate the intervention effects of seated Baduanjin exercise on patients undergoing maintenance hemodialysis(MHD).Methods:A total of 108 MHD patients admitted between July 2022 and July 2023 were selected.They were randomly assigned into two groups:the experimental group,with 55 patients,who received seated Baduanjin exercise combined with leg exercises during dialysis;and the control group,with 53 patients,who only performed leg exercises during dialysis.The psychological state,fatigue symptoms,quality of life,and sleep quality scores were compared between the two groups,and exercise endurance was recorded.Results:After the intervention,the psychological state scores in the experimental group were lower than those in the control group,the fatigue symptom scores were lower,the quality of life scores were higher,the sleep quality scores were lower,and the exercise endurance was higher(P<0.05).Conclusion:Seated Baduanjin exercise can improve the negative psychological state and fatigue symptoms of MHD patients,enhance their quality of life and sleep quality,and effectively increase their exercise endurance.
基金supported by a grant from Innovation Program of Shanghai Municipal Education Commission (No. 09YZ305)a grant from Shanghai Education Science Research Program (No. B08039)a grant from Shanghai Leading Academic Discipline Project (No. S30802)
文摘This study examined the effects of exercise on behavior and peripheral blood leukocyte apoptosis in a rat model of chronic fatigue syndrome (CFS). Thirty-six healthy male Sprague-Dawley rats were equally randomized into 3 groups: the control group, CFS model group and the exercise group in terms of body weight. A total of 25 rats entered the final statistical analysis due to 11 deaths during the study. CFS model was established by subjecting the rats in CFS model group and exercise group to electric shock, chronic restraint stress and cold water swim. Besides, rats in the exercise group took rtmning wheel exercise. After a week of conditioning feeding, model construction and running wheel exercise were performed simultaneously, and lasted for 23 consecutive days. The behavior experiments, including running wheel exercise, open-field test, tail suspension test and Morris water maze test, were conducted, either before or after the model establishment. Rats were sacrificed and peripheral blood was obtained for the assessment of lymphocyte apoptosis index by flow cytometry (FCM). It was found that as compared with those in the control group, the weight of the rats was decreased obviously (P〈0.01), the mobility time in the open-field and the tail suspension tests was shortened significantly (P〈0.01), the time to locate the platform was enhanced (P〈0.01) and the cell apoptosis index was increased substantially (P〈0.01) in the CSF model group. Meanwhile, in comparison to the model group, the behavior in the open-field and the tail suspension tests was improved significantly (P〈0.05), and the apoptosis index decreased remarkably (P〈0.01) in the exercise group. It is concluded that sport intervention can prevent lymphocyte apoptosis and improve animal behavior rather than the memory.
文摘Objective To gain insight on how exercise affects the outcomes of prostate cancer patients treated with androgen deprivation therapy,specifically cancer-related fatigue(CRF) and quality of life(QoL). Methods Systematic searches for randomized clinical trials(RCTs) evaluating the effects of exercise on CRF and QoL of prostate cancer patients receiving androgen deprivation therapy were carried out to identify the eligible studies from EMBASE,Pub Med and Cochrane library. Related data were extracted from eligible studies and then subjected to Reviewer Manage 5.3 for analysis. Standardized mean differences(SMD) and its 95% confidence interval(CI) were calculated. Results In all,10 RCTs involving 841 prostate cancer patients(448 of whom exercised and 393 did not) were included in this study. With respect to CRF,there was good consistency among different studies,and it was remarkably reduced in the exercise group(SMD=-0.32,95% CI:-0.45 to-0.18,P<0.00001,n=784). In regards to QoL,there was also good consistency among different studies,and it was also improved significantly in the exercise group(SMD=0.21,95% CI:0.08 to 0.34,P=0.002,n=841). Conclusion Exercise both reduced CRF and improved QoL in prostate cancer patients receiving androgen deprivation therapy.
基金National Natural Science Foundation of China of China(grant 71363004,71663002,71704071)the Fundamental Research Funds for the Central Universities(lzujbky-2016-ct14,lzujbky-2018-ct05,lzujbky-2018-77)National Research Training Program of Gansu Provincial Hospital(19SYPYA-4).
文摘Objective:To evaluate evidence from published systematic reviews about the effectiveness of exercise interventions on fatigue management in breast cancer patients.Methods:PubMed,Web of Science,the Cochrane Library,the Cumulative Index of Nursing and Allied Health(CINAHL),Embase databases,the China National Knowledge Infrastructure(CNKI),the Wanfang database,the China Biomedical Literature Database(CBM),and the VIP database were searched to identify relevant systematic reviews.The reviews which assessed exercise interventions on cancer-related fatigue(CRF)in breast cancer patients were included.Quality of evidence was evaluated by the Grade of Recommendation,Assessment,Development,and Evaluation(GRADE)tool.The Assessment of Multiple Systematic Reviews(AMSTAR)appraisal tool was used to evaluate the methodological quality of included systematic reviews.Results:Twenty-four systematic reviews met all the inclusion criteria.The overall mean score for AMSATR is 7.38 and ranged from 4 to 10 points.In addition,21 reviews arrived at positive conclusions,which exercises could reduce CRF,and 3 obtained that exercise does not affect fatigue.As for GRADE,8 of the reviews were graded as'moderate',2 of the studies were'very low',and the others were'low'.Conclusions:Aerobic and resistance exercise can be regarded as beneficial to CRF in breast cancer patients,and limited evidence exists that yoga had an effect on reducing fatigue.The quality of the current systematic review is still far from satisfactory.
文摘Purpose: This study examined the possible causal mechanisms of fatigue during intense exercise in the heat in a group of nine sedentary women. Methods: Two strenuous cycling sessions were performed, at 100% of maximal aerobic power, either in neutral (N-Ex, air temperature: 22°C ± 0.4°C, air humidity: 53% ± 8%) or in heat conditions (H-Ex, air temperature: 35°C ± 0.3°C, air humidity: 59 ± 6). Tympanic temperature (Tty), heart rate (HR), body mass loss (BML), lactate concentration [La] and brain electrical activity (EEG: α and β waves and α/β ratio) were recorded. Results: Tty, HR and [La] increases (p ﹣1) than that during N-Ex (0.08 ± 0.02°C·min﹣1), and time to exhaustion (Time Limit at 100%) was significantly (p β waves decreased (p α/β ratio increased (p < 0.05) significantly immediately before exhaustion. Conclusion: During exercise in the heat, the high rate of core temperature rising might be a critical factor triggering faster brain changes.
文摘This study aimed to examine the influence of exercise habits and physical fitness level on subjective fatigue symptoms (SFS) in adolescent students. Four hundred and one healthy young male adults (age: 16.5 +/- 1.2 yr) participated in the physical fitness test of the Ministry of Education, Culture, Sports, Science and Technology in Japan and responded to the questionnaire on exercise habits and SFS. SFS questionnaire was conducted 6 times with a week interval during the physical fitness test. SFS was compared among groups with different physical fitness levels and exercise habit. Significant differences were found in difficulty with concentrated thinking, languor and low vigor, with the high physical fitness group having lower values of the three fatigue factors than the low physical fitness group regardless of affiliation with sports club and gyms, exercise frequency and time. SFS is largely affected by physical fitness level but very little by exercise habits.
基金This study was funded by the International Fellowship Program(IFP),Ford Foundation,USA
文摘Purpose:This study aimed to determine the effectiveness of Relaxation Breathing Exercise(RBE)on fatigue in patients with gynaecological cancer undergoing chemotherapy.Methods:We used a quasi-experiment with pre-and post-test design.Forty-two patients were consecutively sampled,21 of whom were assigned to the group receiving RBE four times a day and 21 to the group receiving RBE twice a day.Fatigue scores were measured every day for 7 days for both groups using the Piper Fatigue Scale.Data obtained were analysed using repeated-ANOVA and independent ttest with a significant level of a<0.01.Results:We found a significant decrease(P<0.01)in the mean fatigue scores of both groups(four times RBE in a day group=3.29±0.59 and twice RBE in a day group=4.19±0.61)after the completion of the intervention.However,the four times RBE a day group showed larger decrease on fatigue scores than the twice RBE a day group did(Mean Difference=0.91;99%CI=0.41 to 1.41;P=0.001).Conclusion:Conducting RBE four times a day effectively alleviated fatigue better than RBE twice a day on gynaecological cancer patients undergoing chemotherapy.
文摘Chronic fatigue syndrome and myalgic encephalomyelitis (CFS/ME) are, amongst others, characterized by exercise intolerance, pain, post exertional malaise and orthostatic intolerance. It has been shown in venous disease and sport participation that compression stockings may improve exercise performance and reduce post exercise muscle soreness. Moreover, its use is advocated in orthostatic hypotension. Therefore, it was hypothesized that compression stockings may reduce symptomatology in CFS/ME patients. Methods: 100 patients used compression stockings class II for minimally 3 weeks and thereafter filled in a questionnaire, based on the Rand 36 physical activity questions (n = 9), whether compression stockings changed perceived symptoms or not. Moreover, 7 questions referring to prolonged standing and sitting, to recovery post exercise, muscle pain during or immediately post exercise, and to dizziness/light-headedness during or immediately post exercise, while standing and during prolonged sitting were added. Questions were scored as 1: able to perform activity much less while wearing the stockings, 2: perform activity somewhat less, 3: no perceived change in activity, 4: perform activity slightly better, 5: able to perform activity much better while wearing the stockings. Results: In patients able to answer the question, all mean scores per activity were significantly higher than 3, being no perceived change in activity while wearing the stockings. Subgroup analysis showed that patients with orthostatic intolerance reported higher effects than patients without orthostatic intolerance. Conclusion: This pilot study suggests that compression stockings may be useful to reduce symptomatology of physical activities in CFS/ME patients, especially in patients with orthostatic intolerance. Larger prospective studies with hard endpoints are warranted.
文摘Physical exercise is a good means of enhancing and maintaining health. However, many people struggle to make exercise be a habit, in part because of the associated fatigue. The present study investigated the effects of tomato juice on fatigue induced by exercise in humans and mice. A study of 10 healthy men and women indicated that drinking tomato juice suppressed post-exercise increases in rated perceived exertion, a subjective fatigue indicator. In mice, a single administration of tomato juice significantly attenuated exercise-induced fatigue, as measured by locomotor activity and blood transforming growth factor β and corticosterone levels. The active substances in tomatoes, which were among the aqueous components as of tomato juice supernatant, showed the same anti-fatigue effects as whole tomato juice. Moreover, these effects were mimicked by water supplemented with the aqueous components (i.e., sugars, organic acids, and amino acids) and were likely exerted by two or more of these components. Our results suggest that consuming tomato juice prior to or during an exercise session can reduce post-exercise fatigue, which could encourage more individuals to incorporate a regular exercise regimen into their daily routine.
基金supported by the National Key Research and Development Program of China(2017YFC1702400).
文摘Objective:To evaluate the anti-fatigue effects of different extracts from Cistanche tubulosa(Schenk)Wight(C.tubulosa,Rou Cong Rong),focusing on central and exercise-induced fatigue in mice.This study investigated the pharmacological effects of the total oligosaccharides,polysaccharides,and phenylethanoid glycosides(CPhGs)extracted from C.tubulosa.Methods: Models of sleep deprivation and forced swimming fatigue were established to simulate central and exercise-induced fatigue.The mice were treated with different extracts of C.tubulosa,and their effects were assessed using behavioral tests to measure exercise capacity,learning,and memory function.Biochemical analyses were performed to evaluate the changes in serum and brain neurotransmitter levels,liver and muscle glycogen storage,and various fatigue-related biomarkers.Results: This study found that treatment with C.tubulosa extract improved exercise capacity,learning,and memory in mice.Total oligosaccharides from C.tubulosa enhanced adrenocorticotropic hormone,cholinesterase,and thyroid-stimulating hormone levels,reduced cortisol levels in central fatigue models,and ameliorated biochemical markers of exercise-induced fatigue,including lowering lactic acid,blood urea nitrogen,and malondialdehyde levels.Among the tested extracts,the total oligosaccharides showed the most comprehensive anti-fatigue effects.Conclusion: The anti-fatigue effects of C.tubulosa,particularly those of its total oligosaccharides,are pronounced in both central and exercise-induced fatigue.These effects are mediated by the regulation of neurotransmitter levels,enhancement of glycogen storage,and improvement of antioxidant enzyme activity,suggesting potential therapeutic benefits in fatigue-related conditions.
文摘Objective:To investigate the effect of moxibustion at Shenque(CV 8)on fatigue in rats with chronic exercise-induced exhaustion.Methods:Thirty male Sprague-Dawley(SD)rats were randomly divided into a blank group,a model group and a moxibustion group,10 rats in each group.Except rats in the blank group,the remaining rats were subjected to create long-term exhaustion models by repeated swimming.After successful modeling,rats in the moxibustion group received mild moxibustion at Shenque(CV 8)for 15 min,once every other day with a total of 10 times.Rats in the model group and the blank group did not receive moxibustion.At the end of the treatment,the exhausted times,and the body weight of rats before and after the experiment were compared among groups.The levels of blood malondialdehyde(MDA)and urea nitrogen(BUN),as well as the activities of aspartate transarninase(AST),alanine aminotransferase(ALT)and lactate dehydrogenase(LDH)were also measured by the automatic biochemical analyzer,24 h after the exhausting excise.Results:The 10 th swimming time was significantly longer in the moxibustion group than that in the model group(P〈0.01).The increase rate of the body weight was lower in the rats of the moxibustion group than that in the model group before the 7 th and the 10 th exhausting excise(P〈0.05,P〈0.01).The levels of serum MDA and BUN,as well as the activities of AST,ALT and LDH in the model group were higher than those in the blank group(all P〈0.01).The levels of serum MDA and BUN,as well as the activities of AST,ALT and LDH in the moxibustion group were lower than those in the model group(P〈0.01).Conclusion:Moxibustion at Shenque(CV 8)can decrease the serum levels of MDA and BUN,as well as activities of AST,ALT and LDH in the long-term fatigue rats,thus to improve the symptoms of fatigue.
文摘Purpose: This study aimed to explore neuromuscular fatigue and recovery profiles im individuals with intellectual disability(ID) after exhausting submaximal contraction.Methods: Ten men with ID were compared to 10 men without ID. The evaluation of neuromuscular function consisted in brief(3 s) isometric maximal voluntary contraction(IMVC) of the knee extension superimposed with electrical nerve stimulation before, immediately after, and during33 min after an exhausting submaximal isometric task at 15% of the IMVC. Force, voluntary activation level(VAL), potentiated twitch(Ptw), and electromyography(EMG) signals were measured during IMVC and then analyzed.Results: Individuals with ID developed lower baseline IMVC, VAL, Ptw; and RMS/M_(max) ratio(root-mean-square value normalized to the maximal peak-to-peak amplitude of the M-wave) than controls(p < 0.05). Nevertheless, the time to task failure was significantly longer in ID vs. controls(p < 0.05). The 2 groups presented similar IMVC decline and recovery kinetics after the fatiguing exercise. However. individuals with ID presented higher VAL and RMS/M_(max) ratio declines but lower Ptw decline compared to those without ID. Moreover, individuals with ID demonstrated a persistent central fatigue but faster recovery from peripheral fatigue.Conclusion: These differences in neuromuscular fatigue profiles and recovery kinetics should be acknowledged when prescribing training programs for individuals with ID.
基金supported by Portuguese Foundation for Science and Technology (FCT) Grant (SFRH/BD/71470/ 2010) under the Human Potential Operating Programsupported by the European Social Found
文摘Purpose: The aim of this study was to investigate the influence of different exercise intensities induced by a soccer specific protocol on kicking performance in soccer players.Methods: Twelve semi-professional male soccer players participated in this study and performed maximal instep kicks before and after the implementation of an exercise protocol to determine the influence of different intensities upon kicking ball velocity and the target-hitting accuracy.Results: Analysis of variance designs with repeated measures showed that maximal ball velocity was affected only after the most intense circuit(F(6, 66) = 2.3; p = 0.041; η2= 0.18), while accuracy was not affected in the protocol(F(6, 66) = 0.19; p = 0.98; η2= 0.02). Low and moderate intensities did not affect accuracy or kicking ball velocity.Conclusion: These findings suggest that kicking ball velocity is influenced by high-exercise intensities. Low and moderate exercise intensities do not affect the performance of the kick, and intensity does not influence accuracy. Otherwise, it is possible that other mechanisms(not only physiological) may influence players during the exercise.