Associations of daily sedentary behavior,physical activity,and sleep with irritable bowel syndrome:A prospective analysis of 362,193 participants

Background:Irritable bowel syndrome(IBS)substantially affects quality of life and requires early prevention.This study aimed to elucidate the relationships between IBS and daily behaviors,including sedentary behavior(SB),physical activity(PA),and sleep.In particular,it seeks to identify healthy behaviors to reduce IBS risk,which previous studies have rarely addressed.Methods:Daily behaviors were retrieved from self-reported data of 362,193 eligible UK Biobank participants.Incident cases were determined by self-report or health care data according to RomeⅣcriteria.Results:A total of 345,388 participants were IBS-free at baseline,during a median follow-up of 8.45 years,19,885 incident IBS cases were recorded.When examined individually,SB and shorter(≤7 h/day)or longer(>7 h/day)sleep duration were each positively associated with increased IBS risk,and PA was associated with lower IBS risk.The isotemporal substitution model suggested that replacing SB with other activities could provide further protective effects against IBS risk.Among people sleeping≤7 h/day,replacing 1 h of SB with equivalent light PA,vigorous PA,or sleep was associated with 8.1%(95%confidence interval(95%CI):0.901-0.937),5.8%(95%CI:0.896-0.991),and 9.2%(95%CI:0.885-0.932)reduced IBS risk,respectively.For people sleeping>7 h/day,light and vigorous PA were associated with a 4.8%(95%CI:0.926-0.978)and a 12.0%(95%CI:0.815-0.949)lower IBS risk,respectively.These benefits were mostly independent of genetic risk for IBS.Conclusion:SB and unhealthy sleep duration are risk factors for IBS.A promising way to mitigate IBS risk for individuals sleeping≤7 h/day and for those sleeping>7 h/day appears to be by replacing SB with adequate sleep or vigorous PA,respectively,regardless of the genetic predisposition of IBS.

Study on the Influence of New Media on College Students’ Physical Exercise Behavior

New media is becoming an important method to promote physical exercise,and it is also an essential factor affecting the physical exercise behavior of college students.This study takes the influence of new media sports information on college students’physical exercise behavior as the research objective.By using a questionnaire survey and mathematical statistics,545 college students in Shandong Province of China are selected as research samples.Based on the theory of new media exposure,fitness behavior theory,and self-efficacy theory,this study systematically discusses the influence and mechanism of new media exposure on the physical exercise behavior of college students in Shandong Province,so as to help college students improve their physical exercise behavior.

Replacement of leisure-time sedentary behavior with various physical activities and the risk of dementia incidence and mortality:A prospective cohort study

Background:Whether or not there is targeted pharmacotherapy for dementia,an active and healthy lifestyle that includes physical activity(PA)may be a better option than medication for preventing dementia.We examined the association between leisure-time sedentary behavior(SB)and the risk of dementia incidence and mortality.We further quantified the effect on dementia risk of replacing sedentary time with an equal amount of time spent on different physical activities.Methods:In the UK Biobank,484,169 participants(mean age=56.5 years;45.2%men)free of dementia were followed from baseline(2006-2010)through July 30,2021.A standard questionnaire measured individual leisure-time SB(watching TV,computer use,and driving)and PA(walking for pleasure,light and heavy do-it-yourself activity,strenuous sports,and other exercise)frequency and duration in the 4 weeks prior to evaluation.Apolipoprotein E(APOE)genotype data were available for a subset of 397,519(82.1%)individuals.A Cox proportional hazard model and an isotemporal substitution model were used in this study.Results:During a median 12.4 years of follow-up,6904 all-cause dementia cases and 2115 deaths from dementia were recorded.In comparison to participants with leisure-time SB<5 h/day,the hazard ratio((HR),95%confidence interval(95%CI))of dementia incidence was 1.07(1.02-1.13)for 5-8 h/day and 1.25(1.13-1.38)for>8 h/day,and the HR of dementia mortality was 1.35(1.12-1.61)for>8 h/day.A 1 standard deviation increment of sedentary time(2.33 h/day)was strongly associated with a higher incidence of dementia and mortality(HR=1.06,95%CI:1.03-1.08 and HR=1.07,95%CI:1.03-1.12,respectively).The association between sedentary time and the risk of developing dementia was more profound in subjects<60 years than in those>60 years(HR=1.26,95%CI:1.00-1.58 vs.HR=1.21,95%CI:1.08-1.35 in>8 h/day,p for interaction=0.013).Replacing 30 min/day of leisure sedentary time with an equal time spent in total PA was associated with a6%decreased risk and 9%decreased mortality from dementia,with exercise(e.g.,swimming,cycling,aerobics,bowling)showing the strongest benefit(HR=0.82,95%CI:0.78-0.86 and HR=0.79,95%CI:0.72-0.86).Compared with APOEε4 noncarriers,APOEε4 carriers are more likely to see a decrease in Alzheimer’s disease incidence and mortality when PA is substituted for SB.Conclusion:Leisure-time SB was positively associated with the risk of dementia incidence and mortality.Replacing sedentary time with equal time spent doing PA may be associated with a significant reduction in dementia incidence and mortality risk.

Investigating College Students’ Diet and Physical Activity Behaviors Regarding Non-Communicable Diseases Prevention in China

We aimed to investigate if college students’ dietary and physical activity adhered to the Chinese Dietary Guidelines, the Composing Editorial Board of Physical Activity Guidelines, and WHO recommendation for NCDs prevention. Methods: A 3-day (2 weekdays and 1 weekend day) 24-hour (24-HRs) dietary recall was conducted to record details of participants’ food consumption. One-way analysis of variance (ANOVA) was applied to examine the influence of the identified demographic variables (including BMI, gender, major, family monthly income, and place of household registration) on the 8 food groups’ consumption. We analyzed the effect of the various demographic variables on sodium intake by the student’s t-test. The questionnaire, International Physical Activity Questionnaire (IPAQ)-Short Form, was utilized to assess participants’ physical activity (PA) level. The Wilcoxon-Mann-Whitney was applied to analyze participants’ physical activity. Results: Our research indicated participants consumed much fewer fruits and vegetables and excessive meats on average for both males and females regarding NCDs prevention. Conclusion: Participants’ dietary intake did not comply with the Chinese Dietary Guide-lines recommendation for chronic diseases prevention. Nutrition knowledge and health education are needed for college students. .

Correlation and pathways of behavioral activation systems mediating physical activity level and depressive symptoms among college students

BACKGROUND Depression is a common mental disorder among college students.The main symptoms include being persistent low mood,sad emotional experiences,lack of pleasure,listlessness,and impaired cognitive function accompanied by tendencies of self-harm and suicide.AIM To clarify the pathways and effects of the behavioral activation system between physical activity and depressive symptoms in college students with depressive symptoms.METHODS This cross-sectional research screened 3047 college students.Of these,472 had depressive symptoms,with a depression detection rate of 15.49%.Furthermore,442 college students with depressive symptoms were analyzed.A one-way analysis of variance and Pearson’s correlation,linear regression,and structural equation modeling analyses were used to explore the correlations and pathways of the interactions between the variables.RESULTS Depressive symptoms were significantly negatively correlated with physical activity(r=-0.175,P<0.001),the behavioral activation system(r=-0.197,P<0.001),and drive(r=-0.113,P=0.017).Furthermore,it was negatively correlated with fun-seeking(FS)(r=-0.055,P=0.251);however,it was not significant.Physical activity was significantly positively correlated with reward responsiveness(RR)(r=0.141,P=0.003)and drive(r=0.124,P=0.009)and not significantly positively correlated with FS(r=0.090,P=0.058).The mediating effect of RR between physical activity and depressive symptoms was significant[B=-0.025,95%confidence interval(95%CI):-0.051 to-0.008,P=0.001].The direct and total effects of physical activity on depressive symptoms and were significant(B=-0.150,95%CI:-0.233 to-0.073,P<0.001;B=-0.175,95%CI:-0.260 to-0.099,P<0.001),respectively.CONCLUSION As physical activity levels increased,depression scores among college students decreased.The mediating effect of RR between physical activity and depressive symptoms was significant.Therefore,colleges and universities should encourage college students with depression to increase their physical activity and improve their behavioral activation system.Particular attention should be paid to RR,which may reduce the prevalence of depressive symptoms.

Physical Activity and Sedentary Behaviors among Chinese Children: Recent Trends and Correlates

Objective This study was aimed at examining the trends and correlates of physical activity(PA)and sedentary behaviors among Chinese children.Methods A total of 4,341 subjects(6,936 observations)aged 6–17 years who participated in the China Health and Nutrition Survey(2004–2015)were included.Of the subjects,41%participated in the survey twice or more.Random-effects ordinal regression models and repeated-measures mixed-effects models were used to examine the PA trends.Quantile regression models were applied to examine the factors influencing PA and sedentary behaviors.Results From 2004 to 2015,the prevalence of physical inactivity among Chinese children aged 6–17 years increased by 5.5%[odds ratio(OR),1.51;95%confidence interval(CI),1.19–1.90;P<0.001].The PA volume declined by 5.8 metabolic equivalent of task-hr/week(P<0.001),and the time spent in sedentary behaviors increased by 1.8 hr/week(P<0.001).Age,ethnicity,and region showed significant effects on the PA volume across the quartiles(P<0.001).Across the quartiles,sedentary time was significantly higher in the children residing in urban areas(P<0.001)or areas with high urbanization levels(P≤0.005)than in their counterparts.Conclusions A declining PA trend among Chinese children aged 6–17 years was observed from 2004 to2015,and certain subgroups and geographical areas are at higher risk of physical inactivity.

Physical activity,sedentary behaviors,physical fitness,and their relation to health outcomes in youth with type 1 and type 2 diabetes:A review of the epidemiologic literature

Diabetes is a leading chronic disease of childhood and adolescence. In addition to the well-known auto-immune, insulin-dependent diabetes mellitus （type 1 diabetes （T 1D））, the past two decades have witnessed the emergence of type 2 diabetes （T2D） in children and adolescents, which previously was only seen in middle-aged or older adults. One of the key components of diabetes management is physical activity （PA）. The beneficial effects of increased PA and decreased sedentary behavior are extremely important in youth with diabetes because of the markedly increased long-term risk of cardiovascular disease in this population compared to persons without diabetes. This review aims to comprehensively summarize the epidemiologic, observational research published and listed in PubMed between 1970 and 2012 on PA and sedentary behaviors, as well as physical fitness in children and adolescents with T1D and T2D. Additionally, we describe briefly the state of knowledge on perceived barriers of PA in persons with diabetes, with a focus on hypoglycemia. Finally, we provide an overview of the epidemiological literature pertaining to health benefits of increased PA in youth with TID and T2D and briefly discuss the topic of exercise-related hypoglycemia, Copyright ~ 2012, Shanghai University of Sport. Production and hosting by Elsevier B.V. All rights reserved.

Long-term efficacy of a computer-tailored physical activity intervention for prostate and colorectal cancer patients and survivors:A randomized controlled trial

Background Physical activity(PA)can improve the physical and psychological health of prostate and colorectal cancer survivors,but PA behavior change maintenance is necessary for long-term health benefits.OncoActive is a print-and web-based intervention in which prostate and colorectal cancer patients and survivors receive automatically generated,personalized feedback aimed at integrating PA into daily life to increase and maintain PA.We evaluated the long-term outcomes of OncoActive by examining the 12-month follow-up differences between OncoActive and a control group,and we explored whether PA was maintained during a 6-month non-intervention follow-up period.Methods Prostate or colorectal cancer patients were randomly assigned to an OncoActive(n=249)or a usual care waitlist control group(n=229).OncoActive participants received PA advice and a pedometer.PA outcomes(i.e.,ActiGraph and self-report moderate-to-vigorous intensity PA(MVPA)min/week and days with≥30 min PA)and health-related outcomes(i.e.,fatigue,depression,physical functioning)were assessed at baseline,6 months,and 12 months.Differences between groups and changes over time were assessed with multilevel linear regressions for the primary outcome(ActiGraph MVPA min/week)and all additional outcomes.Results At 12 months,OncoActive participants did not perform better than control group participants at ActiGraph MVPA min/week,self-report MVPA min/week,or ActiGraph days with PA.Only self-report days with PA were significantly higher in OncoActive compared to the control group.For health-related outcomes only long-term fatigue was significantly lower in OncoActive.When exploratively examining PA within OncoActive,the previously found PA effects at the end of the intervention(6 months follow-up)were maintained at 12 months.Furthermore,all PA outcomes improved significantly from baseline to 12 months.The control group showed small but non-significant improvements from 6 months to 12 months(and from baseline to 12 months),resulting in a decline of differences between groups.Conclusion The majority of previously reported significant between-group differences at 6 months follow-up were no longer present at long-term follow-up,possibly because of natural improvement in the control group.At long-term follow-up,fatigue was significantly lower in OncoActive compared to control group participants.Computer-tailored PA advice may give participants an early start toward recovery and potentially contributes to improving long-term health.

Understanding Chinese international college and university students' physical activity behavior

Objective： To examine factors of the youth physical activity promotion （YPAP） model that are associated with Chinese international students＇ meeting PA recommendations （MPAR）. Methods： A total of 649 （females = 320, males = 329） Chinese international college students participated in the study. This study was conducted in the United States （US.） between June and August in 2011. Participants completed an online survey regarding their demographic, PA, predisposing, enabling, and reinforcing factors. Results： Logistic nested-regression analysis suggested that being male, having a higher body mass index, perceived competence, self-efficacy, attitude, and enjoyment all increased （p 〈 0.001） the participants＇ odds of MPAR. Except language barriers, all of the enabling and reinforcing factors predicted MPAR indirectly through the predisposing factors （p 〈 0.001）. Conclusion： Understanding factors that influence PA among Chinese international students is an important step in the process of promoting their long-term health and wellbeing. Designing program that address the identified key factors may help colleges and universities achieve this goal.

BEHAVIOR OF OXYGEN IN DG^(TM) INVAR-Cu ALLOYS AND ITS EFFECTS ON MECHANICAL AND PHYSICAL PROPERTIES

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The Effects of a Lifestyle Modification Program on a Leisure Physical Activity and Sedentary Behavior in a Brazilian Low Socioeconomic Community

Regular physical activity benefits the health of the general population, more in those with sedentary behaviors. PURPOSE： To verify the impact of adding leisure-time activities to the existed sedentary behaviors. METHODS： A cross-sectional and a longitudinal analysis were undertaken in an ongoing epidemiological study （＂Move for Health＂） conducted by this Institution. The longitudinal study comprised 1572 subjects older than 35 yrs （53.8 ± 11.1 yrs, 76% women） enrolled during the period of 2004 to 2015. After a baseline assessment, the participants were submitted to a 10-week program of supervised physical exercises training and dietary counseling. The physical exercise protocol was composed by daily sessions （100 min）, 3-5x/wk, including warm up/stretching （20min）, 30 rain walking （60%-80% VO2max）, 40min strength in academy （3x 8-12 rep, 60%-70% 1RM） and stretching and cool down （10 min）. By using the International Physical Activity Questionnaire （IPAQ-way long-version 8）, it was evaluated the time spent on sedentary activities during the week and on weekends （h/day）, in the domains of sedentary transport （h/week） and physical leisure activities （h/week） at baseline （M0） and after 10 weeks （MI） of physical intervention. The Student＇s t test was used to compare moments with a significance level of 5%. RESULTS： I was shown that 18.3% presented lower values than 150 min/wk of physical activity. Lower quartile of leisure domain on weekdays along with more sedentary behavior on weekends were determined by socioeconomic characteristics such as lower income and schooling. The sample referred low income （71% earning less than 5 minimum salary wage）, low schooling （52.6% uncompleted elementary school） but in a good-excellent status of health, according their self-perception. Leisure time-physical activity increased 2.12 （P 〈 0.001）. Behaviors of sedentary transport and sitting time either weekdays or weekends did not change significantly （P 〉 0.05）. CONCLUSION： An inexpensive and institutional-conducted lifestyle modification program like the ＂Move for Health＂ can provide extra energy expenditure, as leisure time, to a low socioeconomic community. However, it has been unsuccessfully proved to change other existing sedentary behavior.

The Application of Theoretical Models in the Studies of Physical Activity Behaviors of the Elderly in China

By using the method of literature review, this paper introduces the popular theoretical models which have shown to better explain physical activity behaviors at a certain degree, summarizes the dominating theoretical models in the studies of physical activity behaviors of the elderly in China. In addition, shortcomings and future prospects are pointed out at the end.

Effect of physical activity on healthcare seeking behavior in the general Chinese population:an urban-rural perspective

Background:The“two-week visiting rate in those needing to visit”has been examined extensively as an important indicator of healthcare seeking behavior in China.Nevertheless,its relationship with health behaviors,such as physical activity,remains unknown.In addition,a significant difference exists between urban and rural Chinese people in terms of physical activity and healthcare seeking behavior.This study sought to investigate the relationship between physical activity and the two-week visiting rate by conducting a stratified analysis.Methods:The analysis included 5,801 participants aged above 15 years old.Multivariable logistic regression was applied to analyze the association after adjusting for possible confounding variables.Urban and rural differences were investigated using stratified analysis.Results:Adjusted estimates showed that those who were physically active were more likely to visit a healthcare facility,but only among the whole sample(adjusted odds ratio(AOR)=1.45,95%confidence interval(CI):1.26.1.66)and the rural sample(AOR=1.56,95%CI:1.21.2.01),and not among the urban sample.Conclusions:Educating people on physical activity may help in improving healthcare seeking behavior and vice versa.Additionally,health interventions may be tailored based on different settings.

Reviving Direct Observation Methods for Physical Activity Behavior

Purpose:Current Direct Observation(DO)methods are burdensome to the observer and relevant limitations can be identified on the outcome information.This study aims to characterize DO from the observers’point of view and to analyze the feasibility and usefulness of visual information in the form of video.Method:data collection was done with ten adult males,observed while performing different physical activities in an indoor court.Sessions were video recorded by two cameras.Three observers performed systematic observation,using SOPLAY,with different sampling rates.Inter observer’s agreement and with reference data was analyzed by Cohen’s Kappa statistic.Results:SOPLAY highest agreement between observers was 0.611 on vigorous category and walking category had the lowest 0.188.It doubles the time needed to annotate the video with pauses,but half of player’s behavior is preserved.Conclusion(s):using video to support DO permits to collect more accurate data and a more detailed behavior categorization is warranted.Developments in computer vision are expected to reduce the human efforts in DO methods.

Information behaviors of Chinese K-12physical education teachers:A survey study

Purpose: Given the unique characteristics of physical education(PE) teaching in K-12education,PE teachers' information behaviors deserve special attention.This article reports a survey study of PE teachers' information behaviors,covering information literacy skills and behaviors of information seeking and information use.Design/methodology/approach:A questionnaire survey was conducted of K-12 PE teachers in the Tianjin municipal region of China,with a response rate of 61.9%.Findings:PE teachers lack skills with information retrieval systems in general.The Internet continues to be their primary information source,and they rely more on personal collection and colleagues than the school library for teaching materials.They rarely develop a searching strategy,employ querying tactics,or use advanced search functions,and they tend to be content with finding a few relevant articles.Research limitations:The survey is limited to the Tianjin municipal region in scope.Though attempting to reach 210 participants from 40 schools,it yielded only 130 valid responses.A larger survey covering more regions and with greater responses may be useful.Practical implications:Insights from this study inform the educational and on-job training of K-12 PE teachers to improve their information literacy skills.Originality/value:Little research exists on PE teachers' behaviors of information seeking.This study bridges the gap and enriches our understanding of K-12 teachers' information behaviors.

Physical activity among Chinese school-aged children:National prevalence estimates from the 2016 Physical Activity and Fitness in China The Youth Study

Purpose: This study was to present national estimates of participating in moderate-to-vigorous physical activity(MVPA) and adherence to the recommendations of 60 min/day of MVPA among Chinese school-aged children and to assess demographic differences in MVPA.Methods: Cross-sectional analyses of data from the 2016 Physical Activity and Fitness in China—The Youth Study. Participants were 90,712 primary, junior middle, and junior high school children(boy: 47%; girl: 53%), recruited from 1204 rural and urban schools across 32 administrative provinces and regions in the Mainland of China. Main outcomes were(a) average MVPA minutes per day in the previous 7 days by self-reports and(b) percentage meeting MVPA recommendations.Results: Average MVPA time was 45.4 min/day, with boys having more MVPA(47.2 min/day) than girls(43.7 min/day) overall and across the 3 school grade categories. About 30% of participants met MVPA recommendations, with a higher percentage of boys(32%) than girls(28%) overall and across the 3 grades categories. Urban school children outperformed rural children in terms of MVPA time. Overall, boys were more likely to meet MVPA recommendations(adjusted odds ratio(a OR) = 1.19, 95% confidence interval(CI): 1.16–1.22) compared with girls; children in higher grades(junior middle(a OR = 0.92, 95%CI: 0.87–0.98) and junior high(a OR = 0.59, 95%CI: 0.53–0.66)) were less likely to meet recommendations compared with primary school children. The odds of meeting recommendations did not differ between urban and rural children(p = 0.07),but urban boys were found to be more likely to meet recommendations compared with rural boys(a OR = 1.14, 95%CI: 1.06–1.19).Conclusion: Overall, the average MVPA minutes per day among Chinese school-aged children is low, and less than one-third of them meet MVPA recommendations. These results were most evident among junior middle and junior high school children and those living rural areas.

Overweight, obesity, and screen-time viewing among Chinese school-aged children: National prevalence estimates from the 2016 Physical Activity and Fitness in China—The Youth Study

Purpose: This study presents the most recent estimates of prevalence of overweight, obesity, and screen-time viewing among Chinese school-aged children. Demographic differences in these estimates between sexes and resident locales were also examined.Methods: Cross-sectional analyses of 116,615 Chinese school children 9 to 17 years of age who participated in the 2016 Physical Activity and Fitness in China—The Youth Study project. Outcomes were the prevalence of children's overweight(85 th ≤ body mass index(BMI) < 95 th percentile) and obesity(BMI ≥95 th percentile)(defined by the Working Group on Obesity in China) and not meeting screen-time viewing recommendations("not meeting" was defined as more than 2 h per day of viewing activities after school). Analyses were conducted on the whole sample and by school grade cohorts(primary, junior middle, and junior high schools), sex, and residence locales(urban, rural).Results: Overall, 14.4%(95% confidence interval(CI): 13.8%–15.0%) of children and adolescents were overweight, 11.9%(95%CI: 11.0%–13.0%) were obese, and 36.8%(95%CI: 34.7%–38.9%) did not meet screen-time viewing recommendations. Across the 3-grade cohorts, boys were more likely to be obese than girls, and primary and junior middle school children living in urban areas were more likely to be obese than those living in rural areas. Primary and junior middle school boys were less likely to meet screen-time recommendations than girls, and junior high school children living in urban areas were less likely to meet screen-time recommendations than school children of the same grades living in rural areas.Conclusion: In 2016, the prevalence of obesity among Chinese school children was about 12%, and about 37% of them did not meet screen-time viewing recommendations. The prevalence of obesity and sedentary behavior was generally higher among boys than among girls, and it was higher for children living in urban areas than for those living in rural areas.

Childhood sleep:physical,cognitive,and behavioral consequences and implications

Background Sleep problems in children have been increasingly recognized as a major public health issue.Previous research has extensively studied and presented many risk factors and potential mechanisms for children’s sleep problems.In this paper,we aimed to identify and summarize the consequences and implications of child sleep problems.Data sources A comprehensive search for relevant English language full-text,peer-reviewed publications was performed focusing on pediatric sleep studies from prenatal to childhood and adolescence in a variety of indexes in PubMed,SCOPUS,and Psych Info published in the past two decades.Both relevant data-based articles and systematic reviews are included.Results Many adverse consequences are associated with child sleep deficiency and other sleep problems,including physical outcomes(e.g.,obesity),neurocognitive outcomes(e.g.,memory and attention,intelligence,academic performance),and emotional and behavioral outcomes(e.g.,internalizing/externalizing behaviors,behavioral disorders).Current prevention and intervention approaches to address childhood sleep problems include nutrition,exercise,cognitive–behavioral therapy for insomnia,aromatherapy,acupressure,and mindfulness.These interventions may be particularly important in the context of coronavirus disease 2019.Specific research and policy strategies can target the risk factors of child sleep as well as the efficacy and accessibility of treatments.Conclusions Given the increasing prevalence of child sleep problems,which have been shown to affect children’s physical and neurobehavioral wellbeing,understanding the multi-aspect consequences and intervention programs for childhood sleep is important to inform future research direction as well as a public health practice for sleep screening and intervention,thus improving sleep-related child development and health.

Security enhancement of artificial neural network using physically transient form of heterogeneous memristors with tunable resistive switching behaviors

As a critical command center in organisms,the brain can execute multiple intelligent interactions through neural networks,including memory,learning and cognition.Recently,memristive-based neuromorphic devices have been widely developed as promising technologies to build artificial synapses and neurons for neural networks.However,multiple information interactions in artificial intelligence devices potentially pose threats to information security.Herein,a transient form of heterogeneous memristor with a stacked structure of Ag/MgO/SiN_(x)/W is proposed,in which both the reconfigurable resistive switching behavior and volatile threshold switching characteristics could be realized by adjusting the thickness of the SiN_(x)layer.The underlying resistive switching mechanism of the device was elucidated in terms of filamentary and interfacial effects.Representative neural functions,including short-term plasticity(STP),the transformation from STP to long-term plasticity,and integrate-and-fire neuron functions,have been successfully emulated in memristive devices.Moreover,the dissolution kinetics associated with underlying transient behaviors were explored,and the water-assisted transfer printing technique was exploited to build transient neuromorphic device arrays on the water-dissolvable poly(vinyl alcohol)substrate,which were able to formless disappear in deionized water after 10-s dissolution at room temperature.This transient form of memristive-based neuromorphic device provides an important step toward information security reinforcement for artificial neural network applications.

Validity and Reliability of Chinese Physical Activity Questionnaire for Children Aged 10-17 Years

Objective This study is aimed to report the development,the reliability and validity of the Chinese Children Physical Activity Questionnaire(CCPAQ)which was designed for the assessment of physical activity pattern in young population in China.Methods The CCPAQ was administered for two times in 119 children(mean age 13.1±2.4 years;boys 47%)to examine reliability by using intraclass correlation coefficients.Validity was determined in 106 participants by agreement with the CCPAQ measures and the objective method,the ActiGraph accelerometer.Data on physical activity patter n including time spe nt on d iff ere nt intensi ties and total physical activity,sedentary behavior as well as physical activity energy expenditure were used to assess the validity with Spearman's correlation coefficient and the Bland-Altman plots.Results The reliability coefficient of the CCPAQ ranged from 0.63-0.93(Intra-class correlation coefficient).Spearman's correlation coefficient for validity of time spent on total physical activity and sedentary behavior were all 0.32(P<0.001),and for physical activity energy expenditure was 0.58(P<0.001).Time spent on moderate-to-vigorous physical activity and light physical activity showed a relatively low correlation with the accelerometer(rho=0.20,P=0.040;rho=0.19,P=0.054).Conclusion The CCPAQ appears to be a promising and feasible method to assess physical activity pattern in Chinese children.