Abstract
The influence sedentary time has on cardiorespiratory fitness and health has recently received increased attention. Children become less physically active and more sedentary as they advance through childhood to adulthood, contributing to decrements in cardiorespiratory fitness. PURPOSE: The current study examined the relationship among objectively measured cardiorespiratory fitness, physical activity, and sedentary time in children. METHODS: Participants (n = 35; 15 girls, 20 boys) had cardiorespiratory fitness measured by a maximal treadmill test with VO2 assessed continuously. Sedentary time and physical activity were objectively assessed by accelerometry for 7 days. Multiple linear regression analyses were performed to identify independent associations of sedentary time, light, moderate, and vigorous physical activity with cardiorespiratory fitness. ANCOVA was used to evaluate whether VO2peak varied by high/low physical activity/sedentary time groups (high physical activity, low sedentary time; high physical activity, high sedentary time; low physical activity, low sedentary time; low physical activity, high sedentary time). RESULTS: VO2peak was negatively associated with sedentary time and positively associated with light, moderate, and vigorous physical activity (p < 0.05). Further analysis revealed sedentary time (β = -0.03), waist circumference (β = -0.63), and age (β = 2.06) were significant predictors of VO2peak when not accounting for physical activity in the model. When accounting for physical activity, vigorous physical activity (β = 0.18), waist circumference (β = -0.92), age (β = 2.26), and sex (β = -4.51) were significant predictors of VO2peak. Lastly, VO2peak was higher in the low sedentary/high physical activity and high sedentary/high physical activity groups compared to the high sedentary/low physical activity group (p < 0.05). CONCLUSIONS: These results suggest cardiorespiratory fitness is predicted by vigorous physical activity, waist circumference, age, and sex but not sedentary time in children. Strategies aimed to promote and improve cardiorespiratory fitness and health in children should emphasize vigorous physical activity.
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