Date of Award

Spring 5-5-2016

Degree Type



Exercise Science

First Reader

Kerry McIver

Second Reader

Ray Thompson


Despite the topic’s popularity in research, the relationship between sleep duration and physical activity (PA) remains unclear. Measurement protocol differences, highly specific samples, and incomplete data contribute to varying results suggesting that additional research is needed. The purpose of the TRACK II study was to examine the relationship between PA, BMI, and self-reported sleep in adolescents. 369 9 th and 10 th grade students from 2 diverse school districts participated in the study. Participants completed a self-reported sleep questionnaire and had their height and weight measured. Demographic variables were also reported by participants. Actigraph accelerometers were used to objectively measure physical activity. Participants wore the accelerometers for 1 week and data was collected in 60-second epochs. Minutes of sedentary behavior, light PA, and moderate-to-vigorous PA (MVPA) were determined using age-specific cutpoints. Spearman correlations were used to examine relationships among sleep, physical activity and BMI for the total sample, and by gender and race. Complete data were available for 276 participants (40.2% male). Average self-reported sleep was 7.2 (SD=1.71) hours per weeknight and 8.07 (SD=2.47) hours per weekend night. Average minutes of MVPA was 14.15 minutes/day (SD=14.08). Average BMI was 24.55 kg/m 2 (SD=6.37). No significant correlations between sleep and MVPA or BMI were found for the total group, by gender, or by race. For this small sample of high school students, selfreported sleep was not associated with objectively measured physical activity or BMI. Additional studies using objectively measured sleep are needed before any conclusions can be made.

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