OBJECTIVES: To compare the effects of self-selected and predetermined intensity on sleep quality and duration, daytime sleepiness, and sleep efficiency of adolescents with obesity after 12 weeks of aerobic training. MATERIAL AND METHODS: Thirty-seven adolescents (12 girls), 13 to 18 years old, with obesity (BMI 95th) were randomized into a predetermined intensity group (PIG), exercise intensity around 60 to 70% of heart rate reserve; or self-selected intensity group (SIG), the adolescents chose the speed/intensity at the beginning of each session and were able to change it every 5 minutes. The Pittsburgh Sleep Quality Index (PSQI) and Epworth Sleepiness Scale (ESS) were used to assess sleep outcomes. RESULTS: No differences were observed for PSQI (0.00 +/- 2.00 versus 1.38 +/- 2.7; p = 0.0195; d = 0.60 (moderate effect)), sleep duration (-0.95 +/- 1.2 versus -0.35 +/- 1.6; p = 0.0358; d = 0.41 (small effect)), ESS ((2.10 +/- 3.9 versus 1.15 +/- 4.5; p = 0.0195; d = 0.23 (small effect)), and sleep efficiency (81.5 +/- 24.0 versus 79.4 +/- 17.0; p = 0.08.14; d = 0.10 (trivial effect)) for the PIG and SIG groups, respectively. CONCLUSION: Aerobic training at a self- selected or predetermined intensity does not modulate sleep quality, sleep duration and efficiency, and daytime sleepiness, independent of intensity.

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