Vigorous Physical Activity In Children Research Articles

Impact of Outdoor Play Structures on Moderate to Vigorous Physical Activity in Children during Recess: A Comparative Study.

It is believed that outdoor play structures lead to more physical activity for kids during school recess. However, the intensity of this activity remains unknown. This study explored whether access to outdoor play structures during recess interferes with children's physical activity levels. Forty-one children (8-10 years old) accessed play structures during the afternoon recess but not in the morning for one entire week. To control for temperature differences, the same number of participants from another school who did not access playground structures were invited to participate. Moderate to Vigorous Physical Activity (MVPA) was determined using heart rate reserve. Heart rate was recorded using the Fitbit Inspire 2 (San Francisco, CA, USA) for at least three full school days. Wilcoxon signed-rank and Mann-Whitney U tests analyzed within- and between-group differences. The findings show no difference in MVPA when accessing or not accessing outdoor play structures, both within groups [(n = 37) median (25th-75th) 16 min (7-30) vs. 14 min (5-22)] and between groups [(n = 22) 16 min (7-26)]. The weekly MVPA for all participants (n = 59) [172 min (117-282)] was the strongest variable associated with MVPA during recess [t(df) = 5.40 (38), 95% CI 0.04-0.09, p < 0.001]. accessibility to outdoor play structures does not increase MVPA during recess in children aged 8 to 10. Therefore, schools may need various options for children to play during recess, allowing them to accumulate MVPA.

Accelerometry-assessed daily physical activity and compliance with recommendations in Spanish children: importance of physical education classes and vigorous intensity.

Physical activity (PA) is associated with numerous health benefits. Vigorous PA (VPA) may have a greater impact on public health than lower-intensity PA. The incorporation of a specific recommendation on VPA could complement and improve existing recommendations for average daily moderate-vigorous PA (MVPA). Physical education classes could have a positive impact on children's adherence to average daily physical activity recommendations. The aim was to investigate the association between MVPA and VPA in children, as well as adherence to recommendations, and obesity and the presence of physical education classes. A cross-sectional study of physical activity was conducted in a sample of 8 and 9-year-old children in Andalusia (Spain). GENEActiv accelerometers were used, placed on the non-dominant wrist for at least eight consecutive days (24-h protocol). School days with and without physical education class, and weekend days were defined. ROC curves were used to calculate the threshold associated with obesity for average daily MVPA and VPA for recommendations. A total of 360 schoolchildren were included in the analyses (184 girls). An average of 7.7 (SD 1.4) valid days per participant were evaluated, with 19.9 (SD 10.5) and 11.4 (SD 5.1) minutes of VPA performed by boys and girls respectively. 25.8% of the participants were classified with central obesity. The optimal threshold determined with ROC analysis was 12.5 and 9.5 minutes of average daily VPA for boys and girls, respectively (RecVPA), and 75 minutes of average daily MVPA for both sexes (RecMVPA). The RecVPA showed stronger association with obesity. On school days with physical education class, compared to days without this class, children showed increased VPA and MVPA engagement and better compliance with recommendations, with smaller differences in adherence according to sex or obesity. On days with physical education class, more physical activity was accumulated at all intensities and greater adherence to the recommendations than on days without this class. VPA had a stronger correlation with the absence of obesity than lower-intensity activity. It was also observed that boys were physically more active and had higher adherence to the recommendations than girls.

Effect of physical activity levels on blood lipids, insulin resistance, and adipokines in children with obesity.

Our study was performed to observe children with obesity by using accelerometers and identify their differences in blood lipid levels, insulin resistance, and adipokines based on their physical activity levels. 197 obese children were classified into three groups based on their physical activity levels over a period of 7 days, using the average counts per minute: Sedentary Time (ST), Light Physical Activity (LPA), and Moderate to Vigorous Intensity Physical Activity (MVPA). Blood lipids, including triglycerides (TG), total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C), and low-density lipoprotein cholesterol (LDL-C), were analyzed. Insulin resistance was assessed using the Homeostatic Model Assessment of Insulin Resistance (HOMA-IR) formula. Adipokines, including leptin and resistin, were measured. Our results were obtained through one-way analysis of variance was employed, with Scheffe post-hoc analysis. The statistical significance level was set at p &lt; 0.05 for all analyses. Results showed that the levels of blood lipids (TG: p&lt;0.001, TC: p&lt;0.01, LDL-C: p&lt;0.001, HDL-C: p&lt; 0.05) and adipokines (Leptin, Resistin: p&lt;0.01) of children who had obesity and maintained moderate to vigorous physical activity were healthier than those who engaged in ST or LPA. Specifically, children with obesity engaging in MVPA demonstrated blood lipid and adipokine levels that were normal or close to normal. However, no significant differences in insulin resistance were observed in all groups. In summary, encouraging moderate to vigorous physical activity in children with obesity could help improve obesity indicators, such as blood lipids and adipokines.

O.5.1-5 Influence of the parental perception of the neighborhood environment on physical activity and active school commuting in Ecuadorian children

Abstract Purpose Physical inactivity among children is considered a multidimensional problem. This study examines the relationships between parents' perceptions of the neighborhood environment with physical activity (PA) and active school commuting among urban children from Cuenca-Ecuador. Methods A cross-sectional study was conducted between October 2018 and March 2019 among 1028 children (8 to 12 years old) and their parents/guardians. Children's PA levels were objectively measured using accelerometers (Actigraph). Parent's perceptions of their neighborhood aesthetics, traffic, and crime hazards were assessed using the Neighborhood Environment Walkability Scale for Youth (NEWS-Y) parent version. Active school commuting (ASC) was evaluated using a validated tool applied to the children. Children who reported walking or using a bicycle to commute to and from school five days a week were classified as active commuters. Multivariate ordinary least squares and logistic regressions models were performed to determine associations between parents' perceptions of the neighborhood environment with PA and ASC, respectively. Results Complete data were available from 711 children (52% female) and 521 parents. The parental perceptions of the neighborhood aesthetics (Mean: 2.68; DE:0.75) and traffic hazards (Mean: 2.44; DE:0.44) were not associated with children's physical activity. Neighborhood crime safety (Mean:2.64; DE:0.74) score was negatively associated with the children's vigorous physical activity (Mean:14.50 minutes/day; DE:8.66) level (β = -1.52 minutes/day; DE = 0.52; p &amp;lt; 0.004). After adjusting for walking distance and car ownership, parental perception of neighborhood aesthetics, traffic, and crime hazards were not associated with ASC. Conclusions Crime hazard was identified as the main barrier to children's vigorous PA. The neighborhood environment seems not to be associated with children's ASC. Future studies should identify the determinants for ASC, and comprehensive policies are urgently needed to overcome crime hazards in Ecuador Funding source Universidad de Cuenca, Universidad Politécnica Salesiana Sede Cuenca.

Objectively measured physical activity among treatment seeking children and adolescents with severe obesity and normal weight peers.

Treatment seeking children and adolescents with severe obesity often experience barriers to physical activity. Studies objectively measuring physical activity in this group and investigating explanatory factors for physical activity levels could inform clinical practice. This study aimed to compare objectively measured physical activity levels among treatment seeking children and adolescents with severe obesity and normal weight peers, and to investigate explanatory factors for time spent in moderate physical activity and vigorous physical activity among children and adolescents with severe obesity. Children with severe obesity (n=85) were matched 1:1 by age, gender, and the season for accelerometer measurements with normal weight peers (n=85). Children wore accelerometers for seven consecutive days, yielding measures of physical activity, sleep duration and timing. Parents reported on screen time, parental body mass index and participation in organized sports. Children and adolescents with severe obesity spent significantly less time in moderate physical activity (12min, p<0.001) and vigorous physical activity (21min, p<0.001) per day compared to normal weight peers. No difference for time spent in sedentary activity was found between groups. For participants with severe obesity, age ≤12years (p=0.009) and participation in organized sports (p=0.023) were related to more moderate physical activity, while age ≤12years (p=0.038) and early sleep timing (p=0.019) were related to more vigorous physical activity. Children and adolescents with severe obesity were less physically active than their normal weight peers. Factors related to more moderate and vigorous physical activity in children with severe obesity were lower age, participation in organized sports and earlier sleep timing.

The Combinations of Physical Activity, Screen Time, and Sleep, and Their Associations with Self-Reported Physical Fitness in Children and Adolescents.

Much evidence has indicated that adherence to the 24 h movement guidelines (physical activity, screen time and sleep) is associated with physical health, while little is known about the adherence to the 24 h movement guidelines and self-reported physical fitness in adolescents. This study, therefore, aims to explore the association between the 24 h movement guidelines (in isolation or combination) and self-reported physical fitness in a sample of Chinese adolescents in an age range of 10–17. Methods: A convenient sample of 3807 children and adolescents from 12 schools was adopted in the present study. A questionnaire based on the Health Behaviour in School-aged Children was used to assess physical activity and screen time, and the Pittsburgh Sleep Scale was utilized to measure sleep duration. The International Fitness Scale was used to assess physical fitness in study participants. Ordinal logistic regression was performed to estimate the association between adherence to the 24 h movement guidelines and self-reported physical fitness. Results: Of all study participants, 0.9% of them met the 24 h movement guidelines, and meeting the guidelines was significantly associated with higher levels of self-reported physical fitness. The analysis for the association between specific combinations of 24 h movement guidelines and self-reported physical fitness underscored the importance of meeting the physical activity recommendations. Conclusion: Adherence to more recommendations contained in the 24 h movement guidelines was associated with higher self-reported physical fitness, especially cardiorespiratory fitness and muscular strength. Our study also stressed the importance of promoting moderate to vigorous physical activity in children and adolescents. Further works should focus on the association of a recommendation of adherence with other health indicators and replicate this study on larger samples among Chinese children and adolescents. Additionally, longitudinal or interventional studies that include more socio-demographic factors are needed to explore the association between 24 h movement guidelines and self-reported physical fitness, and the 24 h movement guidelines also should be promoted on a large scale in Chinese children and adolescents. Moreover, it is also needed to gain better insights into the directionality of the relationship between compliance with 24 h movement guidelines and self-reported physical fitness, as well as the mechanisms underlying the associations in Chinese children and adolescents.

Individual heart rate assessment and bout analysis of vigorous physical activity in children.

Children should engage in 1 hr/day of moderate‐to‐vigorous physical activity (MVPA) that results in increased heart rates (HRs) (CDC, 2022). However, precise individualized HR criteria for MVPA are not provided, and it is unclear whether observed behaviors classified as MVPA are associated with elevated HRs indicative of MVPA. The current study replicated an individualized heart rate assessment (IHRA) for identifying MVPA HR zones in children (Van Camp et al., 2021). We then evaluated whether engaging in vigorous PA (VPA) for half of the session resulted in HRs indicative of VPA for at least half of the session when children engaged in running for 30, 60, 90, and 120 s bouts. Individual differences were observed during the IHRA. During the bout analysis, HRs were not within VPA zones for 50% of the session. However, HRs were within moderate PA (MPA) zones, with 30 s bouts producing the highest percentages of MPA.

Scaling the Virtual Fitness Buddy Ecosystem as a School-Based Physical Activity Intervention for Children.

Childhood obesity is a growing concern as it can lead to lifelong health problems that carry over into adulthood. A substantial contributing factor to obesity is the physical activity (PA) habits that are formed in early childhood, as these habits tend to sustain throughout adulthood. To aid children in forming healthy PA habits, we designed a mixed reality system called the Virtual Fitness Buddy ecosystem, in which children can interact with a virtual pet agent. As a child exercises, their pet becomes slimmer, faster, and able to play more games with them. Our initial deployment of this project showed promise but was only designed for a short-term intervention lasting three days. More recently, we have scaled it from a pilot grade study to a 9-month intervention comprised of 422 children. Ultimately, our goal is to scale this project to be a nationwide primary prevention program to encourage moderate to vigorous PA in children. This article explores the challenges and lessons learned during the design and deployment of this system at scale in the field.

Culinary Health Education and Fitness (C.H.E.F.): A Large-Scale Program to Reduce Rural Health Disparity Through Networking and Relationship Building

Abstract Objectives The Culinary Health Education and Fitness (C.H.E.F.) program is a 3-year program designed to help children and families in three Oregon counties (Lincoln, rural Benton and East Linn) achieve higher-quality lives through the promotion of physical activity and nutrition. The program utilized nutrition-focused culinary education that included cooking classes and tasting tables to empower families to be self-sufficient in the kitchen, make healthy food choices and increase exposure to fruits and vegetables. The program also sought to strengthen relationships among health-advocacy stakeholders, train future physicians to deliver nutrition education, and to integrate the Coordinated Approach to Child Health (CATCH) program at school sites as a sustainable program for increasing physical activity in school-aged children. Methods Quantitative and qualitative data were gathered from classes, schools and stakeholders through pre- and post-surveys, interviews, program records, and observation to assess program reach, process evaluation, cooking self-efficacy, physical activity and change in nutrition knowledge. Our mixed methods approach was organized around the concepts of Exposure, Integrity and Intensity (for the process evaluation) and Outcomes. Results The program had extensive reach with &amp;gt;3200 children served at tasting tables, &amp;gt;800 participants in culinary education classes, and &amp;gt;2500 students participated in CATCH at their schools. Nearly 100 community partners, medical students and volunteers were trained to deliver the evidence-based culinary education. The implementation of CATCH increased vigorous physical activity in children. Culinary education courses effectively introduced children to new vegetables and fruits and raised confidence in their ability to prepare healthy foods at home. Relationships flourished through the various meetings, trainings and conferences related to the program. A robust network of health advocacy stakeholders continues to grow across the tri-county area through various activities related to this program work. Conclusions Through a wide array of relationships and community partnerships, the C.H.E.F. program promotes healthy lifestyles and a culture of health in rural Oregon communities. Funding Sources HRSA Rural Network Development Grant.

Physical activity and family-based obesity treatment: a review of expert recommendations on physical activity in youth.

Targeting physical inactivity in children is pertinent to aiding in the decrease of childhood obesity rates. Only 33% of adolescents are obtaining the recommended goal of at least 60 min of physical activity per day. The objectives of this review are to summarize professional recommendations for physical activity and exercise in children and adolescents, and identify family-centred strategies that can be implemented by weight management clinicians. Clinically oriented recommendations and policy statements from professional organizations were identified through literature and internet searches, summarized using rubrics of aerobic, muscle strengthening and bone strengthening exercise, then examined for details on family-based focus, inclusion of child developmental stage and age, and application to the prevention and treatment of obesity. Current recommendations give guidelines for the amount of physical activity that children should acquire and how many days a week activities should occur. However, available guidelines need an improved approach to addressing the role of the parents and caregivers in targeting physical activity and weight management in youth. Efforts must be taken in order to make sure that the types of physical activity offered are both suitable and enjoyable. Sports, games, free play and other age appropriate activities are adequate ways to increase moderate to vigorous physical activity in children. Differentiating physical activities types in accordance with developmental stage, level of enjoyment, and family characteristics is needed to establish sustainable habits. One paediatric obesity program has developed approaches to teaching families fun and engaging ways to be active together.

Convergent validation of a questionnaire to assess the mode and frequency of commuting to and from school

The purposes of this research were to study the convergent validity of the Mode and Frequency of Commuting To and From School Questionnaire using objectively assessed steps and time spent in different physical activity intensities and to compare the self-reported versus objective journey time in Spanish youths. Three hundred and eighty-nine Spanish youth aged 7-19 years were asked to complete the questionnaire and wore an accelerometer for five days. The objective commuting distance and time from home to school were estimated using Google MapsTM. There were significant differences between passive and walking participants on step numbers, sedentary time and physical activity levels (except for vigorous physical activity in children). For children, a mean difference of -4.03 minutes between objective measured and self-reported journey time was found (95% limits of agreement were 13.55 and -21.60 minutes). For adolescents, the mean difference was -1.39 minutes (95% limits of agreement were 15.23 and -18.02 minutes). The findings indicated that the Mode of Commuting To and From School Questionnaire showed a convergent validity to assess this behaviour in Spanish youths. Self-reported journey time for walking is comparable to Google MapsTM in adolescents but not in children.

Body mass index and vigorous physical activity in children and adolescents: an international cross-sectional study.

To examine the relationship between reported vigorous physical activity (VPA) and body mass index (BMI) in children (6-7 years) and adolescents (13-14 years). In the International Study of Asthma and Allergies in Childhood Phase Three, 75 895 children's parents and 199 502 adolescents answered questions relating to VPA, height and weight. The association between VPA and BMI was analysed using general linear models, adjusting for country gross national index. Compared to children who undertook no VPA, those in the infrequent group (once or twice per week) and those in the frequent group (three or more times per week) had mean (95% CI) BMI values 0.07 kg/m2 (0.03-0.11) and 0.09 kg/m2 (0.03-0.15) greater, respectively (p = 0.001). Compared to adolescents reporting no VPA, those in the infrequent group had a BMI 0.19 kg/m2 (0.15-0.23) greater while those in the frequent group had a BMI 0.01 kg/m2 (-0.03-0.05) greater (p < 0.0001). Reported VPA is not associated with lower BMI among children and adolescents. Investigation of VPA and BMI may be best undertaken in conjunction with other variables in the energy expenditure equation. A focus on VPA alone may be an inefficient way to manage BMI.

Aerobic Fitness and Moderate to Vigorous Physical Activity in Children and Adolescents Living with HIV.

To examine aerobic fitness, total moderate to vigorous physical activity (MVPA) and also patterns in terms of MVPA between children and adolescents with human immunodeficiency virus (HIV) and controls, and to determine whether differences, if any, are associated with HIV, sex and highly active antiretroviral therapy (HAART). A cross-sectional analysis was carried out with 130 children and adolescents, aged between 8 and 15 years, divided into two groups (HIV group= 65 patients, control group= 65 healthy participants). Total MVPA was measured by accelerometers and 5 and 10-min bouts were estimated. The peak oxygen uptake (peak VO2) was measured by breath-by-breath respiratory exchange in an incremental cycle ergometer test. HIV-positive participants had lower peak VO2 (39.2 ± 6.8 vs. 44.5 ± 9.1 ml.kg-1min-1), lower bouts of MVPA of 5-min (19.7 ± 16.6 vs. 26.6 ± 23.5) and 10-min (3.6 ± 3.9 vs. 5.8 ± 7.2), but similar total MVPA (49.5 ± 28.9 vs. 49.1 ± 30.6 min.day-1). HIV infection in untreated, nonprotease inhibitors (PI)- based HAART and PI-based HAART patients was associated with lower 8.5 (95%CI= 12.5-4.6), 7.1 (95%CI= 10.6-3.6) and 4.5 (95%CI= 7.0-2.0) ml.kg-1min-1 of peak VO2. Children and adolescents with HIV demonstrated lower aerobic fitness compared with the controls and the absence of HAART may increase peak VO2 impairment. Lower bouts of MVPA were also observed in HIV group despite the similar values of total MVPA of controls.

Findings from the 2016 Active Healthy Kids Scotland Report Card

The Active Healthy Kids Scotland Report Card provides a comprehensive assessment on the physical activity and health of Scottish children and adolescents. PURPOSE: To summarize the report card grades; to identify changes in report card grades since the previous report card published in 2013; to critique Scottish surveillance of physical activity and health in children and young people. METHODS: Report card grades were assigned to 10 indicators related to physical activity and health (7 behavioral indicators and 3 policy and environment indicators). Grades were based on Scottish data which were: recent (published after the 2013 card), derived from nationally representative samples and affected by minimal bias, and determined by the percentage of Scottish children and adolescents meeting an evidence-based benchmark: A is 81% to 100%; B is 61% to 80%; C is 41% to 60%, D is 21% to 40%; F is 0% to 20%; INC is Incomplete data combined with lack of an evidence-based recommendation. Grades were assigned a ‘+’ if trends had improved since the last report card and a ‘-‘ if there was a marked socio-economic inequality in the indicator. RESULTS: Overall Physical Activity, Sedentary Behavior and Obesity received F or F- grades. Active Outdoor Play and Organised Sport Participation were graded as INC. Active Transportation to School/Nursery was graded C, and Diet D-. Family and Peer Influence was graded as D-. Community and the Built Environment, and National Policy were both graded B. Issues with measurement and reporting of several physical activity indicators were identified: no surveillance of moderate to vigorous physical activity in children, no surveillance of active outdoor play and sports participation in children or adolescents, and summary surveillance data not reported in line with evidence-based recommendations. CONCLUSIONS: Grades were similar to those in 2013. Scotland has a favorable environment for physical activity, but children and adolescents have low physical activity and high screen-based sedentary behavior. Better surveillance of physical activity and health in Scottish children and adolescents is required and would encourage more evidence-informed physical activity and health policy in Scotland in future.

Overweight, obesity, steps, and moderate to vigorous physical activity in children.

ABSTRACTOBJECTIVE The objective of this study is to establish cutoff points for the number of steps/day and minutes/day of moderate to vigorous physical activity in relation to the risk of childhood overweight and obesity and their respective associations. In addition, we aim to identify the amount of steps/day needed to achieve the recommendation of moderate to vigorous physical activity in children from São Caetano do Sul.METHODS In total, 494 children have used an accelerometer to monitor steps/day and the intensity of physical activity (min/day). The moderate to vigorous physical activity has been categorized according to the public health recommendation (≤ 60 versus > 60 min/day). Overweight or obesity is defined as body mass index > +1 SD, based on reference data from the World Health Organization. The data on family income, education of parents, screen time, diet pattern, and sedentary time have been collected by questionnaires. Logistic regression and Receiver Operating Characteristic curves have been constructed.RESULTS On average, boys walked more steps/day (1,850) and performed more min/day of moderate to vigorous physical activity (23.1) than girls. Overall, 51.4% of the children have been classified as eutrophic and 48.6% as overweight or obese. Eutrophic boys walked 1,525 steps/day and performed 18.6 minutes/day more of moderate to vigorous physical activity than those with overweight/obesity (p < 0.05). The same has not been found in girls (p > 0.05). The cutoff points to prevent overweight and obesity in boys and girls were 10,500 and 8,500 steps/day and 66 and 46 min/day of moderate to vigorous physical activity, respectively. The walking of 9,700 steps/day for boys and 9,400 steps/day for girls ensures the scope of the recommendation of moderate to vigorous physical activity.CONCLUSIONS In boys, steps/day and moderate to vigorous physical activity have been negatively associated with body mass index, regardless of race, family income, education of parents, screen time, diet pattern, and sedentary time. We suggest, for steps/day and moderate to vigorous physical activity, studies with different ages and populations, with different designs, so as to inform the cause and effect relationship with various health parameters.

Feasibility and Reliability of the System for Observing Play and Leisure Activity in Youth (SOPLAY) for Measuring Moderate to Vigorous Physical Activity in Children Visiting an Interactive Children’s Museum Exhibition

To test the feasibility and reliability of a direct observation method for measuring moderate to vigorous physical activity (MVPA) in children visiting an interactive children's museum exhibition. Direct observation was used to assess MVPA in children visiting an interactive children's museum exhibition on 2 weekend days in winter 2013. The Children's Museum of Manhattan's EatSleepPlay™: Building Health Every Day exhibition. Children (group level) visiting the museum exhibition. System for Observing Play and Leisure Activity in Youth (SOPLAY). Interobserver reliability was analyzed for MVPA and activity type. Two-group analyses were conducted using a series of Wilcoxon rank sum tests. A total of 545 children were observed over 288 observations. No significant differences were found between observers for MVPA ( r = .91, P = .6804) or activity type (κ = .90, P = .6334). Children participated in MVPA during 35.2% of all observations. No significant differences were found for participation in MVPA between boys (37.6%) and girls (32.8%, P = .1589). The SOPLAY may be a useful tool for measuring MVPA in interactive children's museum exhibitions. Research with multiple museum settings and diverse groups of children over longer periods of time is warranted to further establish the feasibility and reliability of the SOPLAY for measuring MVPA in this novel setting.

Factoring in weather variation to capture the influence of urban design and built environment on globally recommended levels of moderate to vigorous physical activity in children

ObjectivesIn curbing physical inactivity, as behavioural interventions directed at individuals have not produced a population-level change, an ecological perspective called active living research has gained prominence. However, active living research...

Validity of SC-StepRx pedometer-derived moderate and vigorous physical activity during treadmill walking and running in a heterogeneous sample of children and youth.

BackgroundThe purpose of this study was to determine the validity of the SC-StepRx pedometer to assess moderate and vigorous physical activity during treadmill walking and running in a heterogeneous sample of children and youth aged 10-17 years.MethodsPhysical activity intensity assessed via indirect calorimetry served as the criterion standard. A convenience sample of 40 participants (20 boys, 20 girls) wore 6 SC-StepRx pedometers, 2 ActiGraph GT3X accelerometers, 2 Actical accelerometers, 1 Walk4Life MVP pedometer and 1 NL-1000 pedometer while walking/running at speeds approximating 2, 3, 4, 6 and 7 METs. Associations between indirect calorimetry and each activity monitor were assessed using linear regression analyses in SAS 9.2.ResultsEstimates of moderate and vigorous physical activity from all monitors were significantly associated with the criterion standard of indirect calorimetry. The strongest associations with the criterion measure were observed for the SC-StepRx with moderate/vigorous thresholds of 110/130 steps•minute−1, and the NL-1000 (R2 = 0.82, p <0.05). The SC-StepRx with moderate/vigorous thresholds of 110/130 steps•minute−1 also exhibited the highest combined sensitivity (92.9%) and specificity (96.5%) for correctly identifying a bout of moderate-to-vigorous physical activity.ConclusionsThis study demonstrates that the SC-StepRx pedometer is a valid tool for the measurement of moderate and vigorous physical activity in children and youth.

Psychometric properties of the physical activity questionnaire for older children (PAQ-C) in the UK

ObjectivesThe Physical Activity Questionnaire for Older Children (PAQ-C) is a validated self-report questionnaire designed to assess moderate to vigorous physical activity in children. Currently however, there are no data supporting the use of the PAQ-C in British samples. DesignTwo studies using independent samples assessed the psychometric properties of the PAQ-C in children aged 9–11 from the UK. MethodStudy one (N = 336) examined general test score characteristics, internal reliability, factor structure and construct validity of the PAQ-C with the Self-Report Habit Index (SRHI). Study two (N = 131) re-examined the factor structure and assessed convergent validity with BMI and cardiovascular fitness (CVF). ResultsThe PAQ-C had acceptable item distribution, item total correlations (>.30) and internal reliability (α = .82 & .84). Exploratory factor analyses (EFA) identified two factors which appear to be sensitive to the context in which the activity is performed ‘in school’ and ‘out of school’. The PAQ-C was related to the SRHI (r = .30) and inversely related to CVF (r = −.38) but not with BMI. ConclusionsWith the exception of one problematic item; physical activity during PE, several analyses suggested that the PAQ-C had acceptable measurement properties in this group. Pragmatically, the ease of use and efficient format of the PAQ-C makes it a feasible option for large studies and/or when time, money and manpower are limited. That said, further development of the PAQ-C may be required for younger samples and its usefulness for intervention research has yet to be established.

Increasing children's physical activity during school recess periods.

We examined whether schools' participation in the Recess Enhancement Program (REP) in the spring of 2011 was associated with higher rates of children's vigorous physical activity. In REP, a coach guides children through age-appropriate games aimed at increasing their physical activity. During recess at 25 New York City public elementary schools (15 REP, 10 non-REP), researchers visually scanned predetermined areas (n = 1339 scans), recording the number of sedentary, walking, and very active children. Multivariate statistical analysis found that participation in REP was a significant predictor (P = .027) of the rate of vigorous physical activity (percentage very active in scan area) whose least-squares means were 41% in REP schools and 27% in non-REP schools. A significantly higher rate in REP schools persisted when the coach was not in the scan area, suggesting a change in the recess culture of REP schools. The rate of vigorous physical activity in REP schools was 14 percentage points, or 52%, higher than the rate in non-REP schools. This low-cost intervention might be a valuable addition to the tools for combating childhood obesity and worth replicating elsewhere.