Physical Activity Behavior Research Articles

Changes in physical activity and sedentary behavior during COVID-19 pandemic restrictions in Germany

Abstract Background During the COVID-19 pandemic’s first wave, mobility restrictions and protective measures have impacted both public and private life. In Germany, the population was advised to stay home except for work, outdoor sport activities, and essential shopping. This study aims to evaluate how these measures affected physical activity and sedentary behavior, focusing on identifying the groups most affected. Methods In April and May 2020, we distributed a COVID-19-specific questionnaire to participants of the German National Cohort (NAKO). The questionnaire was specifically designed to assess changes in physical activity and sedentary behavior compared to pre-restriction levels, along with data on anxiety and depressive symptoms. Results Around 26 % of the 152,421 respondents reported increased sedentary time, and about 38 % reported reduced participation in sport activities compared to pre-restriction levels. Over one-third of those who previously met the WHO’s physical activity recommendation could not maintain it during the restrictions. There was also a notable decline in active transportation (M = - 0.12; 95% CI: -.126; -.117), whereas participants spent more time on recreational physical activities (M = 0.12; 95% CI: .117; .126). Based on multivariable linear and log-binomial regression models, we found that younger people were more affected by the restrictions than older adults. Factors such as transitioning to remote work, self-rated health, and depressive symptoms strongly correlated with changes in all physical activity domains, including sedentary behavior and adherence to physical activity guidelines. Conclusions The shift towards inactivity or low-intensity activities during the nationwide restrictions poses potential long-term health risks, highlighting the urgent need for public health policies to address the negative impact of COVID-19 restrictions on physical activity and sedentary behavior.

Association of healthy lifestyle on overweight and obesity among adolescents in Luxembourg

Abstract Background Adolescent overweight and obesity are significant public health challenges. Understanding the impact of healthy lifestyle behaviours is crucial for effective intervention strategies. The aim of this study is to analyse the association between healthy lifestyle behaviours with overweight and obesity among adolescents in Luxembourg. Methods The study was based on the HBSC Luxembourg 2022 survey and includes 8415 adolescents aged 11 to 18 years. Adolescents self-reported the frequency of fruit and vegetable consumption, physical activity, height, and body mass. Eating and physical activity behaviours were categorized based on WHO recommendations. Body Mass Index categorization followed International Obesity Task Force criteria. Binomial logistic regression of obesity and overweight with the interaction between healthy diet and physical activity was performed, controlling for age, gender, family affluence, migration background, and family structure. Results The results indicated a significant protective effect of healthy lifestyle behaviours against overweight and obesity. For overweight, adolescents engaging in either fruit and vegetable consumption (OR = 0.829, 95% CI [0.697-0.986]) or physical activity (OR = 0.719, 95% CI [0.566-0.913]) showed reduced odds compared to those with unhealthy behaviours. For obesity, similar associations were observed. Adolescents engaging in physical activity (OR = 0.407, 95% CI [0.235-0.705]) showed reduced odds compared to those with unhealthy behaviours. Combining both behaviours resulted in the lowest risk of obesity (OR = 0.366, 95% CI [0.177-0.760]) and overweight (OR = 0.473, 95% CI [0.340-0.658]). Conclusions Promoting health eating and physical activity behaviours are important strategies for preventing overweight and obesity in youth in Luxembourg. Implementing targeted interventions aimed to promote these behaviours could mitigate the burden of overweight and obesity in this population. Key messages • Healthy lifestyle matters: Fruit and vegetables consumption or regular physical activity significantly reduce the risk of overweight and obesity among adolescents. • Combining behaviours counts: Concurrent engagement in both fruit and vegetables consumption and physical activity offers the greatest protection against overweight and obesity.

Identity in the context of physical activity and smoking: A scoping review among adults aged 45+

Abstract Background Identity (i.e., self-perceptions of oneself) plays an important role in health behaviors such as physical activity (PA) and smoking. This review offers a comprehensive synthesis and comparison of how PA- and smoking-related identity is associated with PA and smoking behavior in adults aged 45+. It further synthesizes and compares identity terminology and measurement tools used to capture identity concerning smoking cessation and PA among adults aged 45+. Where applicable, the role of personal, PA-, and smoking-related characteristics were considered. Methods A thorough search across 11 databases, updated in May 2023, yielded 5801 unique publications. Ensuing careful screening procedures, 45 peer-reviewed empirical studies were systematically reviewed. Experts in the field contributed to validate and structure the narrative. Results The review reveals a complex, enduring connection between identity and behavior in both PA and smoking domains, encompassing processes like identity formation, maintenance, change, and loss. In essence, identities linked to PA and abstaining from smoking emerged as pivotal for promoting active lifestyles and successful smoking cessation. Many parallels but also distinctions emerged within this association, alongside variations in the terminology and measurement tools pertaining to identity. Factors such as gender, age, and behavioral history emerged as influential in shaping identities related to smoking and PA. Conclusions Despite variances, findings suggest that the relationship between identity and behavior, including associated processes, may not fundamentally differ between health-promoting and health-compromising behaviors. There is however need for more unified identity definitions and measurement tools. We propose avenues for future research, including exploring causality between identity and behavior to facilitate the development of identity-related smoking cessation and PA-promotion interventions. Key messages • Identities associated with physical activity and refraining from smoking are associated with a physically active lifestyle and successful smoking cessation. • Despite differences, the relationship between identity and behavior may not fundamentally vary between health-promoting and health-compromising behaviors.

Exploring the relationship between occupational stress, physical activity and sedentary behavior using the Job-Demand-Control Model

ObjectivesTo study the relationship between the occupational stress model, specifically the Job Demand-Control Model of Karasek, physical activity level and sedentary behavior.MethodThis is a cross-sectional, observational, descriptive study. A self-administered questionnaire was distributed to 100 volunteers working at Clermont Auvergne University. The questionnaire included the Karasek questionnaire and the International Physical Activity Questionnaire.ResultsThe results reveal that occupational characteristics play a significant role, with individuals exhibiting high job control showing reduced sitting time and increased physical activity compared to those with low job control. Job strain was associated with increased sitting time and decreased physical activity. Further analysis revealed that being in a state of job strain significantly predicted sitting for more than 7 h per day. Similarly, job strain and isostrain were explanatory factors for having a low to moderate physical activity level. Logistic regression quantified the risks, indicating that sitting for more than 7 h per day increased the risk of job strain by 4.80 times, while high physical activity levels and being male reduced the risk by 79 and 84%, respectively. Job strain also increased the risk of prolonged sitting by 5.06 times and low to moderate physical activity levels by 5.15 times. Additionally, mediation analysis revealed that a substantial portion of the association between sitting time and job strain was mediated by physical activity, and vice versa, emphasizing the interconnected nature of sedentary behavior and physical activity in influencing occupational stress.ConclusionThe study highlights the impact of sedentary behavior on occupational stress, assessed using Karasek’s Job-Demand-Control Model. Despite being less studied, sedentary behavior appears to be a relevant contributor to occupational stress. Furthermore, the results emphasize the significant role of physical activity levels, suggesting that it plays a substantial part in the relationship between sedentary behavior and occupational stress.

Leveraging epidemiological data for the development of interventions to promote healthy nutrition and physical activity among adolescents from disadvantaged backgrounds

Abstract ePro-Schools is a public health initiative designed to promote healthy nutrition and physical activity among adolescents from socially disadvantaged backgrounds using a targeted e-health intervention to be deployed in the school context. A central theme of ePro-Schools is its robust cross-sectoral collaboration, involving stakeholders from academia, healthcare, education, and local communities. This cooperative approach not only enhances the intervention’s relevance and efficacy but also ensures its cultural, social, and economic adaptability to the needs of the target population. The project embodies a truly interdisciplinary effort, integrating insights from epidemiology, behavioural science, public health, and digital technology to innovate and improve health promotion strategies. This presentation will explore how data from epidemiological studies, such as the Health Behaviour in School-aged Children (HBSC) study, are used to support the development of the ePro-Schools intervention. Utilizing high-quality epidemiological data, the project identifies key determinants of physical activity, dietary habits, and sedentary behaviour amongst adolescents growing up in low-SES contexts, allowing to craft tailored strategies to promote healthier lifestyles within this vulnerable population.

Effectivess of non-pharmacological interventions on physical activity and sedentary behaviour among patients with coronary heart disease: a systematic review and meta-analysis

Abstract Background Coronary heart disease (CHD) is the leading cause of death worldwide. Adequate physical activity has been firmly established as a protective factor against recurrent CHD events. However, emerging evidence highlights sedentary behaviour as an independent contributor to cardiovascular health. It is thereby imperative to identify effective strategies that promote adequate physical activity while currently reducing sedentary behaviour among patients with CHD. Purpose This systematic review aims to identify the best available evidence on the effectiveness of non-pharmacological interventions (NPIs) on promoting physical activity and/or sedentary behaviours among patients with CHD. Methods This review included randomized controlled trials that examine the effects of NPIs on physical activities or sedentary behaviours or both among patients with CHD. Systematic search was conducted in eight electronic databases (Scopus, MEDLINE, Embase, PsycINFO, Web of Science, CENTRAL, CNKI and WanFang) from inception to December 2023. The version 2 of the Cochrane risk-of-bias tool for randomized trials was used to assess the risk of bias of included studies. Meta-analysis was performed by using the Review Manager 5.4, when deem appropriate. A narrative summary was conducted to address studies that could not be included in the meta-analysis. Results A total of 24 articles of 22 studies, involving 5454 patients with CHD were included. The interventions were categorised as motivational interventions (k=6) and behavioural change technique-based interventions (k=18). The findings of this review involved pooling the results from 18 studies through meta-analysis, while a narrative summary was conducted for the remaining 4 studies. Results showed that both motivational interventions (SMD 0.34, 95% CI: 0.24, 0.45, P= 0.02, I2= 48%) and behavioural change techniques-based interventions (SMD 0.23, 95% CI: 0.10, 0.37, P= 0.0008, I2= 0%) increased the total physical activity time. Additionally, motivational interventions improve the moderate-to-vigorous physical activity time (SMD 0.42, 95% CI: 0.19, 0.65, P= 0.0004, I2= 41%). However, no significant improvement on sedentary behaviours was found from the meta-analysis. Conclusions The findings of this review suggests that motivational interventions have the potential effects to enhance total physical activity time and increase the duration of moderate-to-vigorous physical activity. Further studies on effective intervention that improve the physical activity and concurrently reduce sedentary behaviour are warranted for CHD population.Table 1.Charateristics of studiesFigure 1.Forest plot of outcomes

Physical activity and sedentarism among university students: an approach using a real-life survey

Abstract Background Evidence shows physical activity (PA) and sedentary behavior (SB) impact health-related outcomes. World Health Organization (WHO) provides PA guidelines for different life stages. A recent study revealed that engaging in SB > 6 hours/day increases all-cause mortality risk. Nevertheless many students spend a significant portion of their daily time on SB and PA levels are insufficient. Methods Students were selected by convenience sampling to complete a survey between October-November 2023. A validated PA questionnaire was included including PA Motivations and barriers. PA and SB were classified into 4 levels: Active but sedentary, extremely sedentary, physically active and discreetly active. Data were analyzed using Statistical Package for the Social Sciences (SPSS). Results Out of 2,216 surveys 1,648 were women, 568 men and 59.7% were in first university years. In our sample, 12.9% don’t do PA. Of those doing PA, 47.1% (n = 1043) don’t meet PA recommendations. Regarding SB, 84.7% spend >6 hours/day in SB. When grouped into PA/SB categories 40.5% were extremely sedentary in contrast to 8.8% physically active. Non-university facilities (41.1%) were preferred over university facilities (11.1%). Use of non-university and university facilities correlated with WHO compliance. Main barriers among inactive students were lack of time (48%) and lack of a workout partner (18.6%). Conclusions Most students don’t meet WHO guidelines. Less than 10% are considered active, while 40.5% are extremely sedentary. University sports facilities are underused even if linked to better compliance. To promote facilities as health-promoting spaces and investigate reasons for their underuse is necessary. Lack of company as a reason for not engaging in PA points out the need to strength university sports communities. Key messages • Although many students exercise, the majority do no meet World Health Organization recommendations. • We must intensify university programs to promote physical activity and reduce sedentary behavior.

Independent and joint effects of self-reported physical activity and sedentary behaviors on mortality in community-dwelling older persons: a prospective cohort study

BackgroundThis study aims to assess the joint and independent effects of self-reported physical activity and sedentary behavior on mortality in older persons.MethodsA prospective community-based cohort study was conducted to examine physical activity (PA) level and sitting time (ST) in relation to mortality among 1,786 older persons aged 65 years and above. PA was assessed by a checklist of 26 self-reported items about PA and hours per week, and the metabolic equivalent hours/week was derived, and ST was measured by a self-reported item asking the average number of hours spent sitting per day. The participants were divided into four combination groups of PA and ST based on WHO guideline and values found in literature: high PA/short ST group, high PA/long ST group, low PA/long ST group, and low PA/short ST group. Data on death ascertainment were obtained through linkage with the national death datasets and expanded cardiovascular disease (CVD) included cardiovascular disease, diabetes, and chronic kidney disease.ResultsAfter follow-up for a median 11.1 years, 599 mortality cases were recorded, giving a crude all-cause mortality of 32.5/1,000 person-years, CVD mortality of 8.6/1,000 person-years, expanded CVD mortality of 11.9/1,000 person-years, and nonexpanded CVD mortality of 20.8/1,000 person-years. For all-cause, and expanded CVD, the hazards ratios (HRs) for the low PA/long ST group remained significant compared with that for the high PA/short ST group after all covariates were considered [HRs for all-cause mortality: 1.4 [95% confidence interval (CI) 1.1, 1.8]; and expanded CVD mortality: 1.7 (95% CI 1.1, 2.4).ConclusionsThe independent effect of PA and the joint effects of PA and ST are associated with all-cause and expanded CVD death risks. Expanded CVD mortality may be minimized by engaging in PA and reducing sedentary behaviors.

Reliability, reproducibility, and feasibility of youth activity profile (YAP) questionnaire in Chilean children and adolescents

ABSTRACT This study aimed to evaluate the reliability, reproducibility, and feasibility of the Youth Activity Profile Questionnaire (YAP-SL) in the Chilean version (YAP-C) in a sample of children and adolescents. This cross-sectional study included 160 youth, 59 children (5–11 years old), and 101 adolescents (12–17 years old) from the city of Viña del Mar (Chile). The YAP-SL is a 15-item self-report instrument which was administered twice at an interval of 7 days apart. This questionnaire was designed to capture physical activity (PA) and sedentary behaviour in youths in the last week, categorizing them into three domains: PA at school, PA out-of-school, and sedentary habits. Cronbach’s α coefficients were calculated to evaluate the internal consistency (reliability), and the reproducibility was determined by test-retest and Kendall’s tau b coefficients. Concerning the total YAP-C score, results indicated moderate-to-high reliability in the total sample (0.71), boys (0.76) and girls (0.66), as well as for children (0.73) and adolescents (0.70). The results also revealed variations in reliability and reproducibility across the three domains. In conclusion, the YAP-SL questionnaire presents moderate-to-high reliability in Chilean children and adolescents. However, the reliability and consistency of the YAP varied across the domains.

Physical activity and sedentary behavior as screening tools for dynapenic abdominal obesity and dynapenic obesity in older adults: A cross-sectional investigation

ObjectiveTo investigate the discriminatory capacity of habitual physical activity (HPA) and sedentary behavior (SB) when screening for dynapenic abdominal obesity (DAO) and dynapenic obesity (DO) in older adults. MethodsA cross-sectional population epidemiological investigation was conducted with 207 older adults. Obesity was diagnosed by high waist circumference and body mass index. Dynapenia was identified through low handgrip-strength. ResultsIn men, the best HPA cutoff points to discriminate DAO and DO were, respectively, 80 minutes/week (sensitivity: 100%; specificity: 71.95%) and 145 minutes/week (sensitivity: 100%; specificity: 54.88%). The best SB value for DAO was 351.43 minutes/day (sensitivity: 100%; specificity: 65.85%) and 400 minutes/day (sensitivity: 100%; specificity: 79.27%) for DO. In women, 150 minutes/week was the best HPA value for both DAO (sensitivity: 75%; specificity: 57.84%) and DO (sensitivity: 90.91%; specificity: 56.76%). The best SB cutoff points for DAO and DO were 381.43 minutes/day (sensitivity: 60%; specificity: 82.35%) and 337.14 minutes/day (sensitivity: 72.73%; specificity: 65.80%), respectively. ConclusionBoth HPA and SB demonstrated discriminatory capacity for screening DAO and DO in the study population.

Digital, Social Micro-Interventions to Promote Physical Activity Among Midlife Adults With Elevated Cardiovascular Risk: An Ambulatory Feasibility Study With Momentary Randomization.

Although regular physical activity (PA) mitigates the risk for cardiovascular disease (CVD) during midlife, existing PA interventions are minimally effective. Harnessing social influences in daily life shows promise: digital micro-interventions could effectively engage these influences on PA and require testing. This feasibility study employed ecological momentary assessment with embedded micro-randomization to activate two types of social influences (i.e., comparison, support; NCT04711512). Midlife adults (N = 30, MAge = 51, MBMI = 31.5kg/m2, 43% racial/ethnic minority) with ≥1 CVD risk conditions completed four mobile surveys per day for 7 days while wearing PA monitors. After 3 days of observation, participants were randomized at each survey to receive 1 of 3 comparison micro-interventions (days 4-5) or 1 of 3 support micro-interventions (days 6-7). Outcomes were indicators of feasibility (e.g., completion rate), acceptability (e.g., narrative feedback), and potential micro-intervention effects (on motivation and steps within-person). Feasibility and acceptability targets were met (e.g., 93% completion); ratings of micro-intervention helpfulness varied by intervention type and predicted PA motivation and behavior within-person (srs=0.16, 0.27). Participants liked the approach and were open to ongoing micro-intervention exposure. Within-person, PA motivation and behavior increased from baseline in response to specific micro-interventions (srs=0.23, 0.13), though responses were variable. Experimental manipulation of social influences in daily life is feasible and acceptable to midlife adults and shows potential effects on PA motivation and behavior. Findings support larger-scale testing of this approach to inform a digital, socially focused PA intervention for midlife adults.

Factors Related to mHealth App Use Among Japanese Workers: Cross-Sectional Survey.

Health care providers can make health guidance more effective by using mobile health technologies such as health apps. Although health care providers need to know who uses health apps, existing studies have yielded inconsistent results. The aim of the study was (1) to clarify the prevalence and patterns of health app use to improve health behaviors for preventing lifestyle-related diseases among Japanese workers and (2) to identify the associations among demographic characteristics, health behavior, and internet use and health app use by gender. Data were collected from a cross-sectional internet survey in 2023. In total, 2200 participants were included, with an even distribution of men and women in each age group aged 20 to 60 years. The participants were workers with smartphones and reported their gender, age, residence area, marital status, education, employment status, occupation, work pattern, diseases under treatment, health checkups, health guidance, health behaviors, internet use duration, and number of devices used. We asked about current and previous health app use for 1 month. A multivariate logistic regression analysis was conducted by gender. Of the participants, 472 (21.5%) and 189 (8.6%) were current and previous health app users, respectively. Most current and previous health app users used features that record and track their physical activity and other health behaviors. Health app users-both men and women-were more likely to have health checkups (odds ratio [OR] 1.53, 95% CI 1.12-2.11 and OR 1.51, 95% CI 1.10-2.07, respectively), receive health guidance (OR 2.01, 95% CI 1.47-2.74 and OR 1.86, 95% CI 1.32-2.62, respectively), engage in regular physical activity (OR 2.57, 95% CI 1.91-3.47 and OR 1.94, 95% CI 1.41-2.67, respectively), use the internet for 120-179 minutes per day (OR 1.76, 95% CI 1.13-2.75 and OR 1.70, 95% CI 1.12-2.57, respectively), and were less likely to be older (50-59 years: OR 0.54, 95% CI 0.33-0.88 and OR 0.40, 95% CI 0.25-0.6, respectively, and 60-69 years: OR 0.37, 95% CI 0.22-0.62 and OR 0.47, 95% CI 0.28-0.77, respectively). According to gender, male health app users were more likely to be married (OR 1.69, 95% CI 1.23-2.33) and less likely to work in the security, agriculture, forestry, fishing, manufacturing, or transportation industries (OR 0.62, 95% CI 0.41-0.95). Female health app users were more likely to have a university education or higher (OR 1.55, 95% CI 1.061-2.26), maintain an appropriate body weight (OR 1.52, 95% CI 1.10-2.11), and use 3 or more devices (OR 2.13, 95% CI 1.41-3.23). Physical activity and health guidance are strong predictors of app use. Health care providers should assess the target populations' preferences for app use based on their characteristics, support their app use, and enhance the effectiveness of health guidance.

Prediction of physical activity and nutritional behaviors based on social cognitive theory in middle-aged population at risk of coronary artery disease in Bandar Abbas

AbstractCoronary artery disease (CAD) is the most common cardiovascular disease and the main cause of mortality in developing countries. Since physical activity and nutritional behaviors are modifiable risk factors in people at risk of CAD, the present study aims to explore the effect of an intervention based on the social cognitive theory (SCT) on physical activity and nutritional behaviors in middle-aged population at risk of CAD in the city of Bandar Abbas. The present cross-sectional study was conducted on 519 middle-aged subjects who visited the healthcare centers in Bandar Abbas, southern Iran, in 2023. The sampling was simple randomization. The data were collected using the general physical activity questionnaire, nutritional behavior questionnaire and a questionnaire based on the social cognitive theory (SCT). Descriptive statistics were used to describe the demographic features of the sample. Pearson correlation coefficient was used to test the relationship between the variables of study. Multiple linear regression was used to test the effect of the SCT constructs on physical activity and nutrition behaviors. All statistical analyses and hypothesis testing were done in SPSS 21, at a significance level of 0.05. A total number of 519 subjects participated in this study, whose average age was 44.23 ± 7.14 years. The results of Pearson correlation test showed a statistically significant positive correlation between nutritional behaviors and the constructs of self-efficacy, collective efficacy, outcome expectations, observational learning, normative beliefs, barriers and opportunities, reinforcement and punishment, and behavioral intention. There was also a significant positive correlation between physical activity and self-efficacy, normative beliefs, social support and behavioral intention. Social support, self-efficacy, normative beliefs, observational learning, behavioral skills and knowledge were found to be the predictors of physical activity. Reinforcement and punishment, normative beliefs, collective efficacy, social support and barriers and opportunities were the predictors of nutritional behaviors in the middle-aged population. As the results of the study showed, it is suggested to increase physical activity in the middle-aged population at risk of CAD using appropriate strategies to strengthen social support through family and friends, improve self-efficacy, identify positive and negative normative beliefs. Plans should be made to improve observational learning, increase behavioral skills, and increase knowledge to improve nutritional behaviors, use appropriate strategies to provide timely and appropriate rewards and punishments, identify and strengthen positive normative beliefs, improve collective efficacy, and increase social support. To this aim, families and other individuals around the middle-aged population can help remove barriers and create opportunities.

Evaluating the Psychometric Properties of a Physical Activity and Sedentary Behavior Identity Scale: Survey Study With Two Independent Samples of Adults in the United States.

Emerging evidence suggests a positive association between relevant aspects of one's psychological identity and physical activity engagement, but the current understanding of this relationship is primarily based on scales designed to assess identity as a person who exercises, leaving out essential aspects of physical activities (eg, incidental and occupational physical activity) and sedentary behavior. The goal of this study is to evaluate the validity of a new physical activity and sedentary behavior (PA/SB) identity scale using 2 independent samples of US adults. In study 1, participants answered 21 candidate items for the PA/SB identity scale and completed the International Physical Activity Questionnaire-Short Form (IPAQ-SF). Study 2 participants completed the same PA/SB identity items twice over a 1-week interval and completed the IPAQ-SF at the end. We performed factor analyses to evaluate the structure of the PA/SB identity scale, evaluated convergent validity and test-retest reliability (in study 2) of the final scale scores, and examined their discriminant validity using tests for differences in dependent correlations. The final PA/SB identity measure was comprised of 3 scales: physical activity role identity (F1), physical activity belief (F2), and sedentary behavior role identity (F3). The scales had high test-retest reliability (Pearson correlation coefficient: F1, r=0.87; F2, r=0.75; F3, r=0.84; intraclass correlation coefficient [ICC]: F1: ICC=0.85; F2: ICC=0.75; F3: ICC=0.84). F1 and F2 were positively correlated with each other (study 1, r=0.76; study 2, r=0.69), while both were negatively correlated with F3 (Pearson correlation coefficient between F1 and F3: r=-0.58 for study 1 and r=-0.73 for study 2; F2 and F3: r=-0.46 for studies 1 and 2). Data from both studies also demonstrated adequate discriminant validity of the scale developed. Significantly larger correlations with time in vigorous and moderate activities and time walking and sitting assessed by IPAQ-SF with F1, compared with F2, were observed. Significantly larger correlations with time in vigorous and moderate activities with F1, compared with F3, were also observed. Similarly, a larger correlation with time in vigorous activities and a smaller correlation with time walking were observed with F2, compared with F3. This study provided initial empirical evidence from 2 independent studies on the reliability and validity of the PA/SB identity scales for adults.

Association Between Diet and Mental Health Outcomes in a Sample of 13,887 Adolescents in Canada.

The high prevalence of mental disorders among adolescents calls for community-based and population-level prevention strategies. Diet is an important intervention target for primary prevention of mental disorders among adolescents. We used data from a large longitudinal study of Canadian adolescents (aged 14-18 y) to examine prospective associations between diet and mental health outcomes. We estimated the effect of diet (ie, consumption of vegetables and fruit and sugar-sweetened beverages [SSBs]) at baseline on depressive symptoms, anxiety symptoms, and psychological well-being (measured by the Center for Epidemiologic Studies Depression Scale-Revised, Generalized Anxiety Disorder 7 scale, and Flourishing Scale, respectively) and at 1-year follow-up in a sample of 13,887 Canadian secondary school students who participated in the 2017-2018 and 2018-2019 cycles of the Cannabis, Obesity, Mental health, Physical activity, Alcohol, Smoking, and Sedentary (COMPASS) behavior study. We applied linear mixed-effects methods informed by a directed acyclic graph. Sensitivity analyses assessed the robustness of the effect estimates to unmeasured confounding variables. Baseline SSB consumption was associated with greater severity of depressive (β = 0.04; 95% CI, 0.01-0.06) and anxiety (β = 0.02; 95% CI, 0-0.05) symptoms, particularly among male students, and poorer psychological well-being (β = -0.03; 95% CI, -0.05 to -0.01) at follow-up. Baseline vegetables and fruit consumption was positively associated with psychological well-being (β = 0.06; 95% CI, 0.03-0.10) but not other mental health outcomes at follow-up. Our results support the notion that diet should be part of comprehensive mental health prevention and promotion interventions to reduce the prevalence of mental health disorders among adolescents.

Factors influencing physical activity and sedentary behaviour in contact centres during the COVID-19 pandemic and their relevance for the future of hybrid working.

The COVID-19 pandemic changed the way many industries work, including contact centres, with some employees working from home and new on-site restrictions/measures in place representing even greater challenges for employers around staff engagement and wellbeing. This study aimed to understand the interplay of individual, social, environmental and organisational factors influencing physical activity and sedentary behaviour in UK contact centre employees, how the pandemic impacted these factors, and their relevance for the future of hybrid working. Individual interviews (n = 33) were conducted with participants (staff working full and part time, on site and from home) from four UK contact centres. A topic guide based on the ecological model was developed to understand current barriers and facilitators to physical activity and (reducing) sedentary behaviour during and outside of working hours. Thematic analysis was carried out using a codebook and a deductive coding approach to identify themes. Three key insights are provided. First, participants felt they were generally sitting more and moving less since the first UK-wide lockdown. Second, factors which negatively impacted on these behaviours were evident across all levels of the ecological model. These included individual and social barriers (e.g., lack of motivation and preferable physical activity options) as well as environmental and organisational barriers (e.g., poor home office setup, back-to-back virtual meetings). There were a mix of new and existing barriers (exacerbated by the pandemic) and several of these were linked to homeworking. Third, organisational support requirements (e.g., homeworking ergonomic support) and existing facilitators (such as the provision of informational support and flexible working arrangements) were identified. Solutions to reduce sedentary behaviours and increase physical activity in contact centres need to address barriers from the individual to the organisational level. Whilst the study was undertaken in the UK, the results are like to be applicable globally. Clinical trial registration: The trial for the wider project has been registered on the ISRCTN database: http://www.isrctn.com/ISRCTN11580369.

Early Life Energy Balance: The Development of Infant Energy Expenditure and Intake in the Context of Obesity.

This review aims to provide a summary of the current knowledge on measurement tools and most recent evidence for prenatal and postnatal modulators of energy balance in young infants. The prevention of pediatric obesity depends upon curating the perfect imbalance of energy intake to energy expenditure, taking into consideration the energy needs for healthy growth. We summarize the recent evidence for the programming of fetal and infant metabolism influenced by maternal preconception health, prenatal metabolic milieu, and physical activity behaviors. In the early postnatal environment, caregiver feeding behaviors shape the extent of energy imbalance through dictating quantity and modality of infant energy intake. There are biological and behavioral contributors to improper infant energy imbalance. Furthermore, caregiver and clinician education on overfeeding and clinical tools to prescribe and monitor infant overgrowth are absent. Ultimately, the lack of high-quality and modern research of infant energy expenditure underpins the lack of advancement in clinical guidelines and the needed prevention of pediatric obesity.

Using Qualitative Geospatial Methods to Explore Physical Activity in Children with Developmental Disabilities: A Feasibility Study

Children with developmental disabilities (DDs) experience barriers to physical activity (PA) participation. Greater contextual information regarding their PA behaviors is needed for effective PA promotion. We investigated the feasibility of using activity trackers and Global Positioning Systems (GPS) devices with follow-up interviews to explore PA behaviors in children with DDs. Fifteen children with DDs (aged 10 ± 2 years) wore an activity tracker and GPS device for 7 days. Data were time-aligned to measure PA and identify PA locations. Maps were created to guide follow-up semi-structured interviews with the children and their parents/guardians to understand PA contexts and perceptions of daily PA. The children took 8680 ± 4267 steps/day across 6 ± 1 days. The children provided preferences for PA locations and the parents/guardians gave context by expressing how DDs affect PA and identifying environmental factors in PA locations. The children with DDs who lived near parks, participated in PA that leveraged the strengths of their individual skillsets, and had parents/guardians who provided social support had more positive PA experiences. Combining activity tracking and GPS data with follow-up map-based interviews is feasible to explore PA behaviors and the experiences of children with DDs. This methodology may provide novel insight into daily PA in children with DDs, which can inform how future interventions can support them to be more active and have positive experiences while being active.

Parents' income has influence on levels of physical activity and sedentary behaviour of junior high school student

This study aims to determine physical activity (PA level) and sedentary behavior (SB level) in students with various parents' income levels. This study used a cross-sectional design. The subjects used in this study were 900 students from 10 schools and ten cities in East Java, Indonesia. Data on students' parents' income were grouped into five categories based on their income level (very low: n = 360; low: n = 231; medium: n = 123; high: n = 79; very high: n = 107). The research instruments used were the Children’s Physical Activity Questionnaire (CPAQ) to measure the level of physical activity (PA level) and the Adolescent Sedentary Activity Questionnaire (ASAQ) to measure the level of sedentary behavior (SB level). The results of the Mann-Whitney statistical test showed significant differences in PA level and SB level between the very low-income group of parents and the low, medium, high, and very high-income groups (p<0.05). In conclusion, the higher the level of parental income, the better the students' physical activity, and the lower their sedentary behaviour. Keywords: Family monthly income, physical activity, sedentary behavior, junior high school student

Functional quantile principal component analysis.

This paper introduces functional quantile principal component analysis (FQPCA), a dimensionality reduction technique that extends the concept of functional principal components analysis (FPCA) to the examination of participant-specific quantiles curves. Our approach borrows strength across participants to estimate patterns in quantiles, and uses participant-level data to estimate loadings on those patterns. As a result, FQPCA is able to capture shifts in the scale and distribution of data that affect participant-level quantile curves, and is also a robust methodology suitable for dealing with outliers, heteroscedastic data or skewed data. The need for such methodology is exemplified by physical activity data collected using wearable devices. Participants often differ in the timing and intensity of physical activity behaviors, and capturing information beyond the participant-level expected value curves produced by FPCA is necessary for a robust quantification of diurnal patterns of activity. We illustrate our methods using accelerometer data from the National Health and Nutrition Examination Survey, and produce participant-level 10%, 50%, and 90% quantile curves over 24 h of activity. The proposed methodology is supported by simulation results, and is available as an R package.