Environmental correlates of sedentary behaviors and physical activity in Chinese preschool children: a cross-sectional study

ObjectiveAssociations between self-reported sleep duration and obesity indices in children are well recognised; however, there are no studies on associations between objectively measured other sleep parameters and physical activity with body composition in preschoolers. Therefore, the aim of this study was to determine the associations between sleep parameters and moderate-to-vigorous physical activity (MVPA) with body composition indices in preschoolers using objective measures.DesignA cross-sectional study.ParticipantsThe study group consisted of 676 children aged 5–6 years, who were enrolled in kindergartens in the 2017/2018 school year.Outcome measuresSleep parameters and MVPA were measured using accelerometers for 7 days. Bioelectrical impedance analysis was used to estimate body composition.ResultsSleep duration and sleep efficiency were inversely associated with body fat percentage (BFP) (β=−0.013 and β from –0.311 to −0.359, respectively) and body mass index (BMI) (β from −0.005 to −0.006 and from −0.105 to –0.121, respectively), and directly associated with fat-free mass (FFM) (β from 0.010 to 0.011 and from 0.245 to 0.271, respectively) and muscle mass (β from 0.012 to 0.012 and from 0.277 to 0.307, respectively) in unadjusted and adjusted models. BFP was inversely associated with MVPA and positively associated with number of awakenings and sleep periods. Number of sleep periods was inversely associated with FFM, and positively with BMI and muscle mass. Correlation matrix indicated significant correlation between BFP, FFM and muscle mass with sleep duration, sleep efficiency, number of sleep periods and MVPA.ConclusionsPeriodic assessment of sleep parameters and MVPA in relation to body composition in preschool children may be considered, especially in those who are at risk for obesity.

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Environmental correlates of physical activity in multiple sclerosis: A cross-sectional study

International Journal of Behavioral Nutrition and Physical Activity ◽

10.1186/1479-5868-4-49 ◽

2007 ◽

Vol 4 (1) ◽

pp. 49 ◽

Cited By ~ 24

Author(s):

Shawna E Doerksen ◽

Robert W Motl ◽

Edward McAuley

Keyword(s):

Physical Activity ◽

Multiple Sclerosis ◽

Cross Sectional Study ◽

Sectional Study ◽

Cross Sectional ◽

Environmental Correlates

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Distinct Methods for Assessing Compliance With a Physical Activity Guideline for Children in Preschools

Journal of Physical Activity and Health ◽

10.1123/jpah.2018-0703 ◽

2019 ◽

Vol 16 (10) ◽

pp. 902-907 ◽

Cited By ~ 2

Author(s):

Connie L. Tompkins ◽

Erin K. Shoulberg ◽

Lori E. Meyer ◽

Caroline P. Martin ◽

Marissa Dennis ◽

...

Keyword(s):

Physical Activity ◽

Preschool Children ◽

Average Method ◽

Cross Sectional Study ◽

Physical Activity Guideline ◽

Institute Of Medicine ◽

Sectional Study ◽

Cross Sectional ◽

Guideline Compliance ◽

The Us

Background: According to the US Institute of Medicine guideline, preschool-aged children should participate in ≥15 minutes of physical activity (PA) per hour or 3 hours per day over 12 hours. Examinations of PA guideline compliance to date averaged time spent in PA over several days; however, children could exceed the guideline on some days and not on others. Therefore, this cross-sectional study examined PA guideline compliance in preschool children based on number of minutes per hour (average method) and percentage of days the guideline was met (everyday method). Methods: PA was measured by accelerometry during the preschool day for up to 10 days in 177 children (59.3% males, Mage = 4.23). Minutes per hour and percentage of time in light, moderate to vigorous, and total PAs were calculated. Percentage of days in compliance was determined by number of days in compliance (defined as the child active on average ≥15 min/h) divided by total accelerometer days. Results: Children engaged in PA, on average, 17.01 minutes per hour, suggesting that on average, children are meeting the guideline. However, children were only in compliance with the PA guideline 62.41% of assessment days. Conclusions: Findings demonstrate the importance of examining compliance with both the average and everyday methods to more accurately portray level of Institute of Medicine PA guideline compliance.

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