期刊文献+

二次检索

题名
关键词
文摘
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到579篇文章
< 1 2 29 >
每页显示 20 50 100
Association of Squatting Activities of Pregnant Women during the Antenatal Period and Labor Outcomes
1
作者 Sharada Manoj Aruna Siriwardena Pulukkuttige Ama Madhushani Perera Janakie Karunasingha 《Open Journal of Obstetrics and Gynecology》 2024年第2期278-294,共17页
Aim: To investigate impact of antenatal squatting activities on labour outcomes. Methods: All eligible primigravida women, with singleton cephalic fetuses, who presented to ward 18 of Colombo South Teaching Hospital, ... Aim: To investigate impact of antenatal squatting activities on labour outcomes. Methods: All eligible primigravida women, with singleton cephalic fetuses, who presented to ward 18 of Colombo South Teaching Hospital, Sri Lanka, during the period 1st of February to 28th of May 2017 were invited into the study. Those who were already in active stage of labor (at least more than two moderate contractions per 10 minutes) on admission were excluded. Demographic data such as age, ethnicity, religion, educational level, occupation, latrine type in use, and booking Body mass index (BMI) were collected via an interviewer administered questionnaire. Data related to labor (modified Bishop score at onset of active labor, labor augmentation, pain relief, labor duration, mode of delivery, episiotomy or tears) and neonatal outcome (birth weight, APGAR score at 1, 5, 10 minutes) were collected from delivery notes. A pre tested interviewer administered questionnaire was used to obtain data regarding routine squatting activities during the previous 6 months. Pain visual analogue scale was used on day after delivery to assess the degree of labour pain. Duration of each squatting activity per day and number of days engaged with the activity per week;were used to calculate total squatting hours per week. In the absence of an accepted threshold for adequate squatting, we employed the sample mean as an operational data-driven threshold to define “more” against “less” squatting activities. Women who did not have squatting activities were considered as the controls. We used chi-square and Fisher’s exact tests to compare characteristics and outcomes between those engaging in more and less levels of squatting activity. We fitted a series of logistic regression models with each dichotomized outcome as the dependent variable, more/less squatting activity as the main independent variable of interest, and age, gestation period, BMI and patient’s occupation as covariates. The resulting adjusted odds ratios (AOR) and their 95% confidence intervals (CI) and statistical significance (p < 0.05) were used to draw conclusions of adjusted associations. Results: We recruited 430 women into this study. Overall, 68% of the women were of 20 - 30 years old, 47% had normal body mass index and 65% were housewives. The most frequent squatting activities were for urination/defecation and clothes washing (146 and 62 minutes/week, respectively). Mean total time was 246 minutes per week, of which more than 147 women (34%) achieved above this level of squatting activities. Those with more squatting activities had a greater modified Bishop Score ≥ 6/10 (92% vs 82%;p < 0.01);labor duration of <6 hours (82% vs 56%;p < 0.01), less likely for labour augmentation (39% vs 51%;p < 0.01) and pain relief (53% vs 65%;p = 0.013). Similar results were obtained after adjustments for maternal age, BMI, gestational age and occupation. However, there were no significant differences in the mode of delivery (normal vaginal vs instrumental vs caesarean), episiotomy rate, birth weight and neonatal Apgar scores. Conclusion: Squatting activities of more than 246 minutes per week may improve labor outcome. Women should be encouraged to increase squatting exercises or incorporate more habitual squatting activities antenatally. 展开更多
关键词 Antenatal squatting Labor Outcomes
下载PDF
Squat,Stoop,or Semi-squat:A Comparative Experiment on Lifting Technique
2
作者 王正伦 吴磊 +3 位作者 孙敬智 何丽华 王生 杨磊 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 SCIE CAS 2012年第4期630-636,共7页
There are actually no sufficient data for lifting technique assessment.A laboratory study was undertaken to determine the effect of 3 regular lifting techniques on erector muscle activation,cardiovascular strain and s... There are actually no sufficient data for lifting technique assessment.A laboratory study was undertaken to determine the effect of 3 regular lifting techniques on erector muscle activation,cardiovascular strain and subjective response.Thirty student volunteers participated in the study,and were required to lift a weight with different techniques.Stoop-,squat-,semi-squat-lifting resulted in 3,2 and 1 time of the highest percentage of the maximum voluntary electrical activation(MVE%) respectively.In the same order,the lowest median frequency(MF) existed 1,1 and 2 times.Muscle fatigue was 4 times in squat,36 in semi-squat and 43 in stoop lifting.Heart rate was the highest in squat and lowest in stoop respectively,with a middle level in semi-squat lifting.It may be recommended to adopt mainly the semi-squat technique for daily lifting works.For heavy lifting,it should use the squat technique.Stoop lifting may also be used alternatively but for light things. 展开更多
关键词 LIFTING stoop squat semi-squat muscle fatigue ELECTROMYOGRAPHY JASA analysis heart rate comparative experiment
下载PDF
Different squatting positions after total knee arthroplasty: A retrospective study
3
作者 Tie-Jian Li Jing-Yang Sun +3 位作者 Yin-Qiao Du Jun-Min Shen Bo-Han Zhang Yong-Gang Zhou 《World Journal of Clinical Cases》 SCIE 2022年第23期8107-8114,共8页
BACKGROUND Total knee arthroplasty(TKA)has been shown to improve quality of life and reduce pain.High-flexion activities such as squatting,kneeling,and floor transfers are mainly listed as demanding tasks.Among them,s... BACKGROUND Total knee arthroplasty(TKA)has been shown to improve quality of life and reduce pain.High-flexion activities such as squatting,kneeling,and floor transfers are mainly listed as demanding tasks.Among them,squatting is an important position.AIM To provide a new squat position classification and evaluate the different squatting positions of a series of patients after primary TKA.METHODS From May 2018 to October 2019,we retrospectively reviewed 154 video recordings of the squatting-related motions of patients after TKA.Among the included patients,119 were women and 35 were men.Their mean age at the index surgery was 61.4 years(range,30 to 77).RESULTS The median follow-up was 12 mo(range,6 to 156 mo).We classified those squatting-related motions into three major variations according to squatting depth:Half squat,parallel squat,and deep squat.The angles of hip flexion,knee flexion,and ankle dorsiflexion were measured in the screenshots captured from the videos at the moment of squatting nadir.A total of 26 patients were classified as half squats,75 as parallel squats,and 53 as deep squats.The angles of hip flexion,knee flexion,and ankle dorsiflexion all differed significantly among the three squatting positions(P<0.001).In the parallel squat group,the mean knee flexion angle(°)was 116.5(SD,8.1;range,97 to 137).In the deep squat group,the mean knee flexion angle(°)was 132.5(SD,9.3;range,116 to 158).CONCLUSION Among the three squatting positions,deep squat showed the highest hip,knee,and ankle flexion angles,followed by the parallel squat.With the improvement of squatting ability,the patient's postoperative satisfaction rate was also significantly enhanced.However,the different squatting abilities of the patients cannot be effectively distinguished from the scoring results(P>0.05).Our squatting position classification offers a pragmatic approach to evaluating patients’squatting ability after TKA. 展开更多
关键词 High flexion OUTCOME squat squatting position Total knee arthroplasty
下载PDF
Power Output and Electromyography Activity of the Back Squat Exercise with Cluster Sets 被引量:3
4
作者 Jordan M. Joy Jonathan M. Oliver +2 位作者 Sean A. McCleary Ryan P. Lowery Jacob M. Wilson 《Journal of Sports Science》 2013年第1期37-45,共9页
Recently, it has been demonstrated that hypertrophic training with CLU (cluster) sets produces greater strength and power following a 12-week periodized program. The results suggest possible differences in neuromusc... Recently, it has been demonstrated that hypertrophic training with CLU (cluster) sets produces greater strength and power following a 12-week periodized program. The results suggest possible differences in neuromuscular adaptations. Therefore, we sought to compare the acute effect of TRD (traditional) and CLU set configurations during the parallel back squat on mean power output and integrated EMG (electromyography) activity of the VL (vastus lateralis) and BF (biceps femoris). Ten males (23 ~ 2.4 years; height 182.9 ~ 6.1 cm; weight 86.2 ~ 4.2 kg; 5 ~ 2 years training) performed the parallel back squat using TRD and CLU with 75% 1RM (one-repetition maximum) in a randomized crossover design. Data was analyzed by a repeated measures--ANOVA (analysis of variance). A significant effect of set (P = 0.006) was observed in mean power output. Mean power output decreased over each successive set when collapsed for condition. Clusters resulted in greater mean power output during latter repetitions of each set (repetition 4, 6-10; P 〈 0.05). A significant effect of set (P = 0.049) was observed in VL EMG. VL EMG increased over each successive set when collapsed for condition. TRD training produced significantly greater VL EMG during latter repetitions of each set (repetition 6-8; P 〈 0.05). An interaction was observed in BF EMG. No significant differences were observed in post-hoc. Thus, cluster sets can be used to achieve greater power output, but greater neuromuscular activity should not be expected relative to traditional training. 展开更多
关键词 CLUSTER interset rest ELECTROMYOGRAPHY power squat intraset rest.
下载PDF
Analysis of kinematic data and determination of ground reaction force of foot in slow squat 被引量:2
5
作者 Xu-Shu Zhang Yuan Guo +1 位作者 Mei-Wen An Wei-Yi Chen 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2013年第1期143-148,共6页
In the present paper, the ground reaction force (GRF) acting on foot in slow squat was determined through a force measuring system, and at the same time, the kinematic data of human squat were obtained by analyzing ... In the present paper, the ground reaction force (GRF) acting on foot in slow squat was determined through a force measuring system, and at the same time, the kinematic data of human squat were obtained by analyzing the photographed image sequences. According to the height and body weight, six healthy volunteers were selected, three men in one group and the other three women in another group, and the fundamental parameters of subjects were recorded, including body weight, height and age, etc. Based on the anatomy characteristics, some markers were placed on the right side of joints. While the subject squatted at slow speed on the force platform, the ground reaction forces on the forefoot and heel for each foot were obtained through calibrated force platform. The analysis results show that the reaction force on heel is greater than that on forefoot, and double feet have nearly constant force. Moreover, from processing and analyzing the synchronously photographed image sequences in squat, the kinematic data of human squat were acquired, including mainly the curves of angle, angular velocity and angular acceleration varied with time for knee, hip and ankle joints in a sagittal plane. The obtained results can offer instructive reference for photographing and analyzing the movements of human bodies, diagnosing some diseases, and establishing in the future appropriate mathematical models for the human motion. 展开更多
关键词 Ground reaction force. Force sensor. Kinematic data. Foot. squat
下载PDF
NDI of Rail Squats and Estimating Defect Size and Location Using Lock-In Thermography 被引量:1
6
作者 Daren Peng Rhys Jones 《Engineering(科研)》 2013年第1期29-38,共10页
Rail squats are a form of near surface rolling contact fatigue damage found in rail heads. Currently, the most popular method to detect the rail squats is utilizing ultrasonic techniques to determine their presence an... Rail squats are a form of near surface rolling contact fatigue damage found in rail heads. Currently, the most popular method to detect the rail squats is utilizing ultrasonic techniques to determine their presence and measure their depths. This technique needs to be direct contact between the probe and the rail head, with a coupling fluid in at the interface. Other weaknesses of these ultrasonic techniques include false detections as well as missed detections. Infrared thermography is a relatively new non-destructive inspection technique used for a wide range of applications but is not used for rail squat detection. Lock-in thermography is a non-destructive inspection technique that can be used for the detection of near surface defects. It utilizes an infrared camera to detect the thermal waves and then produces a thermal image, which displays the local thermal wave variation in phase or amplitude. In inhomogeneous materials, the amplitude and phase of the thermal wave carries information related to both the local thermal properties and the nature of the structure being inspected. This comparison is then used to determine the phase angle difference (Δf) between the input and the thermal response of the object. The aim of this paper is to determine whether lock-in thermography can be used to firstly locate squats in rails, and secondly measure their depths. It has demonstrated the feasibility for using such a technique in generating thermal responses that could be adequately utilized for the purpose of defect characterization. 展开更多
关键词 LOCK-IN THERMOGRAPHY Phase CONTRAST Infrared Camera squat NON-DESTRUCTIVE Inspection
下载PDF
Finite Element Method Study on the Squats Growth Simulation
7
作者 Daren Peng Rhys Jones 《Applied Mathematics》 2013年第5期29-38,共10页
A simplified finite element analysis on the squats growth simulation and the effect different contact stresses has been presented. This analysis is based on the element removal study to simulate squat growth in a rail... A simplified finite element analysis on the squats growth simulation and the effect different contact stresses has been presented. This analysis is based on the element removal study to simulate squat growth in a rail track under cyclic loading. The major principal stress (maximum principal stress failure theory) has been used as failure criteria. Evolution strategies are derived from the biological process of evolution, to find squats growth path solution to a complex rail/ wheel contact problem. 展开更多
关键词 FEM squats COMPLEX CRACK GROWTH GENETIC ALGORITHM
下载PDF
A new passive transfemoral prosthesis mechanism based on 3R36 knee and ESAR foot providing walking and squatting
8
作者 Amer Imran Borhan Beigzadeh Mohammad Reza Haghjoo 《Theoretical & Applied Mechanics Letters》 CSCD 2023年第5期399-407,共9页
Researchers have proposed various linkage mechanisms to connect knee and ankle joints for above-knee prosthe-ses,but most of them only offer natural walking.However,studies have shown that people assume a squatting po... Researchers have proposed various linkage mechanisms to connect knee and ankle joints for above-knee prosthe-ses,but most of them only offer natural walking.However,studies have shown that people assume a squatting posture during daily activities.This paper introduces a novel mechanism that connects the knee joint with the foot-ankle joint to enable both squatting and walking.The prosthetic knee used is the well-known 3R36,while the energy storing and return(ESAR)prosthetic foot is used for the ankle-foot joint.To coordinate knee and ankle joint movements,a six-bar linkage mechanism structure is proposed.Simulation results demonstrate that the proposed modular transfemoral prosthesis accurately mimics the motion patterns of a natural human leg during walking and squatting.For instance,the prosthesis allows a total knee flexion of more than 140°during squatting.The new prosthesis design also incorporates energy-storing mechanisms to reduce energy expenditure during walking for amputees. 展开更多
关键词 Transfemoral leg amputation Passive prosthesis squatTING WALKING Six-bar mechanism Energy saving
下载PDF
Effect of Knee Valgus Angle during Single Leg Squat and Horizontal Hop for Distance in Patients with Patellofemoral Pain and Controls
9
作者 Hussain S. Ghulam 《International Journal of Clinical Medicine》 2021年第6期261-271,共11页
Background: Patellofemoral pain (PFP) is considered one of the most common dysfunctions of the lower extremities. Faulty lower limb mechanics and increased of knee valgus on loaded tasks are believed to play an import... Background: Patellofemoral pain (PFP) is considered one of the most common dysfunctions of the lower extremities. Faulty lower limb mechanics and increased of knee valgus on loaded tasks are believed to play an important role in the development of PFP. Objective: To figure out if male PFP patients during single leg horizontal hop for distance and squat with greater knee valgus than controls, and if the nature of the task changes the angles of knee valgus. Methods: Twenty males with unilateral PFP formed the patient group and forty-five asymptomatic males formed the control group. Two dimensional (2-D) frontal plane projection angle (FPPA) was used during single leg squatting and horizontal hop for distance tasks. Results: For the single leg squat, the mean of 6.96<span style="white-space:nowrap;">°</span>, 9.80<span style="white-space:nowrap;">°</span>, 15.04<span style="white-space:nowrap;">°</span> was reported in the control, PFP asymptomatic knee, and PFP symptomatic knee, respectively. For the single leg horizontal hop for distance, the mean of 11.63<span style="white-space:nowrap;">°</span>, 13.72<span style="white-space:nowrap;">°</span>, 19.17<span style="white-space:nowrap;">°</span> was reported in the control, PFP asymptomatic knee, and PFP symptomatic knee, respectively. These differences were significant (<em>p </em>< 0.002) for both tasks. Conclusions: Patients with PFP represented with greater knee valgus angle than what was found in either their asymptomatic limb or in the control group. 展开更多
关键词 Knee Valgus Hop Tests squat Patellofemoral Pain CONTROLS
下载PDF
Kinetics and Benefits of an Unique Assisted Free Bodyweight Squatting System: The DB Method®TM
10
作者 Gerard C. Gorniak 《Open Journal of Therapy and Rehabilitation》 2022年第4期211-243,共33页
Squatting movements are used frequently in the activities of daily living and squatting exercises are used to strengthen abdominal core and lower limb muscles. However, many individuals cannot perform a traditional sq... Squatting movements are used frequently in the activities of daily living and squatting exercises are used to strengthen abdominal core and lower limb muscles. However, many individuals cannot perform a traditional squat. An alternative is to hire a physical trainer or coach for supervision which can be prohibitively expensive. The DB Method<sup><sup><sup>&reg</sup></sup></sup> machine is unique and affordable. A product satisfaction descriptive survey to owners of The DB Method machine describes increased gluteal, core, pelvic floor and lower body strength, an improvement in gluteal region shape, and an increase in activity and energy level. A surprising result of the survey was that this DB Method also seemed to strengthen the pelvic floor muscles and, in some cases, to lessen urinary incontinence. In this article, the results of this survey are described as the kinetics of this machine relative to the lower limbs and the pelvic floor muscles. A comparison between traditional squats and The DB Method and the benefits of using The DB Method are discussed. 展开更多
关键词 squats KINETICS Gluteus Maximus Pelvic Floor Posterior Pelvic Tilt Functional Applications
下载PDF
Pilot Study of Phosphine RECIRCULATION FUMIGATION OF PHOSPHINE in Squat Silos
11
作者 WEN Sheng-shan 《科技信息》 2013年第1期264-266,共3页
Taking into account the squat silos with high grain line and large-volume storage characteristics, to ensure that the stored grain secu rity, we compared phosphine RECIRCULATION FUMIGATION OF PHOSPHINE with the conven... Taking into account the squat silos with high grain line and large-volume storage characteristics, to ensure that the stored grain secu rity, we compared phosphine RECIRCULATION FUMIGATION OF PHOSPHINE with the conventional circulation fumigation method and compared with test data which measured by the analysis and research. Squat Silos taken positions on the circulation phosphine fumigation insecticidal methods, not only to achieve the purpose of the pesticide control, and effectively reduce the cost of fumigation, a decrease of gas in the fight against the occu pational hazards, and have achieved good results. 展开更多
关键词 法律 法学 理论 研究
下载PDF
浅圆仓地震侧压力计算公式推导与分析
12
作者 张国祥 曾荣 《地震工程学报》 北大核心 2025年第1期33-40,共8页
仓壁侧压力是浅圆仓抗震设计的重要参数,在规范中没有给出确切的浅圆仓仓壁地震侧压力的理论计算公式。对此,基于极限平衡法,将浅圆仓看作特殊的曲线挡墙,取单位弧长的滑动楔体为研究对象,采用拟静力法与旋转地震角法简化地震力以进行... 仓壁侧压力是浅圆仓抗震设计的重要参数,在规范中没有给出确切的浅圆仓仓壁地震侧压力的理论计算公式。对此,基于极限平衡法,将浅圆仓看作特殊的曲线挡墙,取单位弧长的滑动楔体为研究对象,采用拟静力法与旋转地震角法简化地震力以进行极限平衡分析,并推导出浅圆仓锥堆与平堆工况下的地震侧压力计算公式。通过算例分析,比较满仓状态下地震侧压力的实测数据值及理论计算值,初步验证公式的正确性。对地震侧压力进行数值模拟与参数分析,结果表明模型拟合效果良好,仓壁摩擦力影响较大,在计算中不可忽视;在平堆工况下半径取值对大直径浅圆仓地震侧压力的影响较小,可将其简化为直线挡墙计算。研究成果可为完善筒仓规范中地震侧压力的计算推导提供一定的参考依据。 展开更多
关键词 浅圆仓 极限平衡法 滑动楔体 地震侧压力 拟静力法 旋转地震角法
下载PDF
DETERMINATION OF QUADRICEPS FORCES IN SQUAT AND ITS APPLICATION IN CONTACT PRESSURE ANALYSIS OF KNEE JOINT 被引量:5
13
作者 Yuan Guo Xushu Zhang +1 位作者 Meiwen An Weiyi Chen 《Acta Mechanica Solida Sinica》 SCIE EI 2012年第1期53-60,共8页
While the quadriceps muscles of human body are quite important to the daily ac-tivities of knee joints,the determination of quadriceps forces poses significant challenges since it cannot be measured in vivo.Here,a nov... While the quadriceps muscles of human body are quite important to the daily ac-tivities of knee joints,the determination of quadriceps forces poses significant challenges since it cannot be measured in vivo.Here,a novel approach is presented to obtain the forces in squat through the combination of motion photography,force transducers measuring,multi-rigid-body theory and finite element analysis.Firstly,the geometrical and angular data of human for squat process were obtained through the analysis of photographed pictures for human squat with cam-era.At the same time,force transducers were used to measure the reaction forces from feet and to determine the center of gravity for identical squat process.Next,based on the multi-rigid-body dynamics,a mathematical model for human right leg and foot was established in order to determine the quadriceps torques under different squat angles.Then,so as to determine the quadriceps forces along with varied squat angles,a simplified three-dimensional finite element model was built,including tibia,fibula,patella,patella ligament and quadriceps tendon.Finally,the contact pressure of knee joint was analyzed for the squat with the established model of knee joint involving the obtained quadriceps forces from finite element analysis.And it showed that in the 0-90 degree squat process,the peak value of contact pressure of articular cartilages and menisci is increased with the increased squat angle.This study can be referenced for further un-derstanding of the biomechanical behaviors of knee,contact pressure effects of daily activities on knee,and is significantly instructive for sports rehabilitation. 展开更多
关键词 quadriceps force force transducers motion analysis finite element analysis squat
原文传递
Numerical simulation of squat reinforced concrete wall strengthened by FRP composite material 被引量:1
14
作者 Ali KEZMANE Said BOUKAIS Mohand Hamizi 《Frontiers of Structural and Civil Engineering》 SCIE EI CSCD 2016年第4期445-455,共11页
The advanced design rules and the latest known earthquakes, have imposed a strengthening of reinforced concrete structures. Many research works and practical achievements of the application of the external reinforceme... The advanced design rules and the latest known earthquakes, have imposed a strengthening of reinforced concrete structures. Many research works and practical achievements of the application of the external reinforcement by using FRP composite materials have been particularly developed in the recent years. This type of strengthening seems promising for the seismic reinforcement of buildings. Among of the components of structures that could affect the stability of the structure in case of an earthquake is the reinforced concrete walls, which require in many cases a strengthening, especially in case where the diagonal cracks can be developed. The intent of this paper is to present a numerical simulation of squat reinforced concrete wall strengthened by FRP composite material (carbon fiber epoxy). The intent of this study is to perform finite element model to investigate the effects of such reinforcement in the squat reinforced concrete walls. Taking advantage of a commercial finite element package ABAQUS code, three-dimensional numerical simulations were performed, addressing the parameters associated with the squat reinforced concrete walls. An elasto-plastic damage model material is used for concrete, for steel, an elastic-plastic behavior is adopted, and the FRP composite is considered unidirectional and orthotropic. The obtained results in terms of displacements, stresses, damage illustrate clearly the importance of this strengthening strategy. 展开更多
关键词 simulation strengthening reinforced concrete wall squat wall FRP composite material DAMAGE ABAQUS
原文传递
Experimental and numerical research on squat silo and large size horizontal warehouse during quasi-steady-state storage 被引量:2
15
作者 Ren Guangyue Liu Yanan +2 位作者 Peng Wei Duan Xu Zhang Ledao 《International Journal of Agricultural and Biological Engineering》 SCIE EI CAS 2016年第6期214-222,共9页
Traditional method to prevent stored grain from deterioration is to control grain temperature.A three dimensional(3-D)numerical model was established to study the temperature variation in outdoor squat silo and large ... Traditional method to prevent stored grain from deterioration is to control grain temperature.A three dimensional(3-D)numerical model was established to study the temperature variation in outdoor squat silo and large size horizontal warehouse at quasi-steady-state.In this research,porous media model and solar radiation model were adopted.Numerical and experimental results showed that grain temperature was influenced by temperature of wall,height of grain and the distance between grain and the wall.Temperature changes dramatically at the top layer of grain heap due to solar radiation and heat convection at air layer.Temperature of grain close to wall increased with the increasing of ambient temperature.The model established in this research is suitable for predicting grain temperature in outdoor squat silo and large size horizontal warehouse. 展开更多
关键词 squat silo large size horizontal warehouse porous media model solar radiation model three dimensional numerical model grain temperature quasi-steady-state storage
原文传递
Protocol-optimizing study of combining Tuina and horse-riding squat exercise for knee osteoarthritis 被引量:1
16
作者 XING Hua SHEN Jiayun +7 位作者 GONG Li LI Jianhua SHAO Sheng CHU Yuzhou HE Pengfei CHEN Hao KANG Zhiran DAI Dacheng 《Journal of Acupuncture and Tuina Science》 CSCD 2022年第2期139-151,共13页
Objective To evaluate the efficacy of Tuina(Chinese therapeutic massage)manipulation plus horse-riding squat exercise in treating knee osteoarthritis(KOA)and optimize the combining protocol.Methods Based on a 2×2... Objective To evaluate the efficacy of Tuina(Chinese therapeutic massage)manipulation plus horse-riding squat exercise in treating knee osteoarthritis(KOA)and optimize the combining protocol.Methods Based on a 2×2 factorial design,120 eligible KOA patients were randomized into a manipulation group(group A1B2),a manipulation plus horse-riding squat group(group A1B1),a sitting knee-adjustment group(group A2B2 group),and a sitting knee-adjustment plus horse-riding squat group(group A2B1),with 30 cases in each group.The intervention was conducted three times a week,lasting for four weeks.The Western Ontario and McMaster Universities osteoarthritis index(WOMAC)was taken as the major measure for efficacy evaluation(including three component scores,pain,stiffness,and daily function,and total score).Results The three component scores(pain,stiffness,and daily function)and the total score of WOMAC showed significant differences after the intervention in the four groups(P<0.05).There were significant inter-group differences in the WOMAC stiffness score amongst the four groups after the intervention(P<0.05).In group A1B1,the step length,stride,walking speed,and knee joint flexion angle changed significantly after treatment(P<0.05).After the intervention,the step length changed significantly in group A1B2(P<0.05),and the walking speed changed significantly in group A2B1(P<0.05).There were no significant differences in the step length,stride,walking speed,or knee joint flexion angle among the four groups(P>0.05).The extensor peak torque at 180°/s changed significantly in group A1B2 after treatment(P<0.05).Neither the intra-group nor the inter-group comparisons of the four groups revealed significant differences in the other isokinetic muscle strength parameters(P>0.05).The main effect of manipulation showed significant in affecting the WOMAC pain and total scores(P<0.05).The main effect of horse-riding squat exercise showed significant in affecting the WOMAC pain and stiffness scores(P<0.05).Conclusion The four treatment protocols all can improve the symptoms of KOA,for instance,relieving pain and stiffness,and enhancing daily function.Group A2B1 produces the most eminent effect in relieving joint stiffness.The main effects of both manipulation and horse-riding squat exercise are significant in reducing pain.Besides,the main effect of horse-riding squat exercise is significant in relieving joint stiffness. 展开更多
关键词 TUINA MASSAGE Manual Therapies Physical and Breathing Exercises Horse-riding squat Exercise Osteoarthritis Knee Factorial Design
原文传递
Squat motion of a bipedal robot using real-time kinematic prediction and whole-body control
17
作者 Wenhan Cai Qingkai Li +3 位作者 Songrui Huang Hongjin Zhu Yong Yang Mingguo Zhao 《IET Cyber-Systems and Robotics》 EI 2022年第4期298-312,共15页
Squatting is a basic movement of bipedal robots,which is essential in robotic actions like jumping or picking up objects.Due to the intrinsic complex dynamics of bipedal robots,perfect squatting motion requires high-p... Squatting is a basic movement of bipedal robots,which is essential in robotic actions like jumping or picking up objects.Due to the intrinsic complex dynamics of bipedal robots,perfect squatting motion requires high-performance motion planning and control algorithms.The standard academic solution combines model predictive control(MPC)with whole-body control(WBC),which is usually computationally expensive and difficult to implement on practical robots with limited computing resources.The real-time kinematic prediction(RKP)method is proposed,which considers upcoming reference motion trajectories and combines it with quadratic programming(QP)-based WBC.Since the WBC handles the full robot dynamics and various constraints,the RKP only needs to adopt the linear kinematics in the robot's task space and to softly constrain the desired accelerations.Then,the computational cost of derived closed-form RKP is greatly reduced.The RKP method is verified in simulation on a heavy-loaded bipedal robot.The robot makes rapid and large-amplitude squatting motions,which require close-to-limit torque outputs.Compared with the conventional QP-based WBC method,the proposed method exhibits high adaptability to rough planning,which implies much less user interference in the robot's motion planning.Furthermore,like the MPC,the proposed method can prepare for upcoming motions in advance but requires much less computation time. 展开更多
关键词 bipedal robot real-time kinematic prediction squatTING whole-body control
原文传递
蹲厕行为对胶囊内镜检查胃转运时间和全小肠检查率的影响
18
作者 李霞 何松 +1 位作者 王小梅 吴志轩 《陆军军医大学学报》 CAS CSCD 北大核心 2024年第11期1265-1269,共5页
目的研究蹲厕行为对胶囊内镜检查胃转运时间(gastric transit time,GTT)和全小肠检查率(complete examination rate of small bowel,CER)的影响。方法随机纳入2019年1-12月于重庆医科大学附属第二医院行胶囊内镜检查的患者122例,采用随... 目的研究蹲厕行为对胶囊内镜检查胃转运时间(gastric transit time,GTT)和全小肠检查率(complete examination rate of small bowel,CER)的影响。方法随机纳入2019年1-12月于重庆医科大学附属第二医院行胶囊内镜检查的患者122例,采用随机数字表法将其分为试验组63例和对照组59例,试验组即吞服胶囊后随时可以蹲厕,对照组如需如厕采取坐便。比较2组患者GTT、小肠转运时间、CER和诊断率的区别。结果试验组和对照组患者在性别、年龄、住院情况等方面差异无统计学意义。试验组患者CER显著高于对照组(92.06%vs 79.66%),差异有统计学意义(P=0.048)。试验组患者中位GTT显著少于对照组(26.7 vs 45.6 min),差异有统计学意义(P=0.027)。两组患者在小肠转运时间和诊断率上差异无统计学意义。结论行胶囊内镜检查患者采用蹲厕行为能减少胶囊在胃内转运时间,增加全小肠检查率。 展开更多
关键词 胶囊内镜 蹲厕 胃转运时间 全小肠检查率
下载PDF
上下双层浅圆仓中心卸料的动态效应分析
19
作者 金立兵 王旭 +2 位作者 朱豆豆 吴强 王振清 《粮油食品科技》 CAS CSCD 北大核心 2024年第5期193-201,共9页
上下双层浅圆仓作为一种新型粮食储藏结构,既可以保证储粮品质,又具有节约用地、节能减碳、机械化程度高等优势。采用离散元与有限元结合的方法,构建了上下双层浅圆仓中心卸料过程粮食颗粒与仓壁之间动态响应的数值分析模型,利用实验与... 上下双层浅圆仓作为一种新型粮食储藏结构,既可以保证储粮品质,又具有节约用地、节能减碳、机械化程度高等优势。采用离散元与有限元结合的方法,构建了上下双层浅圆仓中心卸料过程粮食颗粒与仓壁之间动态响应的数值分析模型,利用实验与缩尺模型相结合的方法验证了缩尺方法的有效性;分别将缩尺模型数值分析与理论计算结果进行对比,验证了数值方法的可行性;进而对上下双层浅圆仓中心卸料过程粮食-仓体的相互作用进行了分析。结果表明:中心卸料过程中上下层均出现了侧压力突增和震荡的现象,且在越接近每层仓壁中间位置处,超压系数越大;粮食-仓体共同作用后上下层仓壁的应力均在距离仓壁底部1/4处达到最大。本文可为上下双层浅圆仓的结构设计提供技术支持,有利于其推广应用,具有重要的工程应用价值。 展开更多
关键词 双层浅圆仓 中心卸料 离散元 数值分析 动力响应
下载PDF
心肌做功联合运动负荷评估非梗阻性肥厚型心肌病左室收缩储备功能
20
作者 叶腾 李慧 +1 位作者 贾志军 廖书生 《温州医科大学学报》 CAS 2024年第10期798-805,共8页
目的:应用无创左心室压力-应变环(LVPSL)定量评估非梗阻性肥厚型心肌病(NHCM)患者蹲起负荷试验前后左室心肌做功变化,为临床左室收缩储备功能的评估、制定个体化运动处方提供参考。方法:选取2022年1月至2023年12月温州医科大学附属第一... 目的:应用无创左心室压力-应变环(LVPSL)定量评估非梗阻性肥厚型心肌病(NHCM)患者蹲起负荷试验前后左室心肌做功变化,为临床左室收缩储备功能的评估、制定个体化运动处方提供参考。方法:选取2022年1月至2023年12月温州医科大学附属第一医院经超声心动图明确诊断的37例NHCM患者。测量并比较蹲起负荷试验前后左心室整体长轴应变(LVGLS)及心肌做功参数,分析心肌做功参数与LVGLS的相关性。结果:负荷组较静息组收缩压升高,差异有统计学意义(P<0.05),左室射血分数增高值差异无统计学意义(P>0.05)。负荷组较静息组整体LVGLS绝对值、整体有效功(GCW)、整体无效功(GWW)增加,差异均有统计学意义(P<0.05),整体做功指数(GWI)、整体做功效率(GWE)减低,差异均无统计学意义(P>0.05)。静息状态下,GWI、GCW、GWE与LVGLS呈正相关,GWW与LVGLS呈负相关;负荷状态下,GWI、GCW、GWE与LVGLS呈正相关。心肌做功参数观察者内、观察者间重复性较好。结论:运动负荷后,LVGLS仅轻微升高,GCW显著升高,LVPSL联合运动负荷超声心动图可作为NHCM患者评估心功能储备更敏感的指标。 展开更多
关键词 心肌做功 非梗阻性肥厚型心肌病 蹲起负荷试验
下载PDF
上一页 1 2 29 下一页 到第
使用帮助 返回顶部