Length of moderate-to-vigorous physical activity bouts and cardio-metabolic risk factors in elementary school children
Erik A Willis, Lauren T Ptomey, Amanda N Szabo-Reed, Jeffery J Honas, Jaehoon Lee, Richard A Washburn, Joseph E Donnelly, Erik A Willis, Lauren T Ptomey, Amanda N Szabo-Reed, Jeffery J Honas, Jaehoon Lee, Richard A Washburn, Joseph E Donnelly
Abstract
Background: Accumulating moderate-to-vigorous physical activity (MVPA) in bouts of 10 min is associated with improved cardio-metabolic risk factors (CMRF) in adults.
Purpose: To assess the association between the lengths of MVPA bouts and CMRF in elementary school age children.
Methods: The sample included 396, 2nd and 3rd grade students from eastern Kansas (182 boys, 214 girls; age 7.6 ± 0.6 years; Body Mass Index Percentile [BMI%ile]: 61.6 ± 9.3) in the fall of 2011. Analyses were conducted in 2014. MVPA bouts were defined as sporadic (<5 min), short (5-<10 min) or medium-to-long (≥10 min). Latent profile analysis was used to identify distinct subgroups (classes) based on the composition of MVPA bouts. Bayesian probability-based Wald chi-square test was used to compare CMRF between classes controlling for age, sex, BMI%ile, and total moderate and total vigorous PA.
Results: Three classes of accumulated physical activity were identified: A (n=78); 97% sporadic 2%, short, 1% medium-to-long bouts; B (n=174); 93% sporadic, 5% short, 2% medium-to-long; C (n=144); and 86% sporadic, 9% short, 5% medium-to-long bouts. Class C had significantly lower BMI%ile (57.3 ± 2.3 (SE)), waist circumference (WC; 55.8 ± 0.5 cm) compared with Class A (BMI%ile=70.9±0.5, p<0.01.030, WC=61.0 ± 1.0 cm, p=0.<0.01). Class B had significantly lower WC (56.6 ± 0.6 cm), p<0.01 than Class A. No significant differences between classes were shown in other outcomes.
Conclusion: Children who accumulated MVPA with a higher percentage of short (5-<10 min) and medium-to-long bouts (≥10min) had lower BMI%ile, and WC compared with children who accumulated MVPA with a lower percentage short and medium-to-long bouts.
Trial registration: ClinicalTrials.gov NCT01699295.
Keywords: Accelerometer; Bouts; Cardio-metabolic risk factors; Physical activity.
Conflict of interest statement
Conflict of Interest
The authors report no conflict of interest
Copyright © 2015 Elsevier Inc. All rights reserved.
Source: PubMed