Kendra N Krietsch1, Bridget Armstrong2, Christina S McCrae3, David M Janicke2. 1. Department of Clinical and Health Psychology, University of Florida and kkrietsch@phhp.ufl.edu. 2. Department of Clinical and Health Psychology, University of Florida and. 3. Department of Health Psychology, University of Missouri.
Abstract
OBJECTIVE: Examine average interindividual and temporal intraindividual associations between time of sleep onset (sleep onset), total sleep time (TST), and minutes in moderate-to-very-vigorous physical activity per hour (MVPA/h) among overweight/obese youth. METHODS: Overweight/obese youth (n = 134; 7-12 years) wore an accelerometer for 16+ hr/day, 5-7 days, which provided daily objective estimates of MVPA/h, TST, and sleep onset. RESULTS: Multilevel models revealed an intraindividual effect of TST, such that nights with longer TST preceded less MVPA/h during the midnight-to-midnight monitoring period; a significant random effect qualified this relationship. Average interindividual TST did not predict mean MVPA/h, whereas sleep onset significantly predicted mean MVPA/h. CONCLUSIONS: Later time of sleep onset (as opposed to TST) was the strongest predictor of group-level decreased physical activity. At the individual level, longer TST than usual predicted less MVPA/h than usual. Results suggest the need for more person-centered research and a greater focus on sleep timing among youth.
OBJECTIVE: Examine average interindividual and temporal intraindividual associations between time of sleep onset (sleep onset), total sleep time (TST), and minutes in moderate-to-very-vigorous physical activity per hour (MVPA/h) among overweight/obese youth. METHODS: Overweight/obese youth (n = 134; 7-12 years) wore an accelerometer for 16+ hr/day, 5-7 days, which provided daily objective estimates of MVPA/h, TST, and sleep onset. RESULTS: Multilevel models revealed an intraindividual effect of TST, such that nights with longer TST preceded less MVPA/h during the midnight-to-midnight monitoring period; a significant random effect qualified this relationship. Average interindividual TST did not predict mean MVPA/h, whereas sleep onset significantly predicted mean MVPA/h. CONCLUSIONS: Later time of sleep onset (as opposed to TST) was the strongest predictor of group-level decreased physical activity. At the individual level, longer TST than usual predicted less MVPA/h than usual. Results suggest the need for more person-centered research and a greater focus on sleep timing among youth.
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