Resumen de Effects of Strength Training on Sleep Parameters of Adolescents: A Randomized Controlled Trial
Ladyodeyse da Cunha Silva Santiago, Maria Julia Lyra, Antônio H.G. Soares, Ozéas de L. Lins-Filho, Daniel Da Rocha Queiroz, Thaliane Mayara Pessôa dos Prazeres, Marco Túlio de Mello, Rodrigo P. Pedrosa, Ana P.S.T. Falcao, Marcos A.M. Santos
This study aimed to examine the effects of 12 weeks of strength training (ST) on sleep quality and daytime sleepiness in adolescents with sleep complaints. Thirty adolescents were randomly assigned to 2 groups: ST group (ST, n = 18) and control group (CG, n = 12). Anthropometric, body composition, one-repetition maximum test, and sleep parameters (Pittsburgh Sleep Quality Index [PSQI] and Epworth Sleepiness Scale [ESS]) were evaluated. Training consisted of 55 min[middle dot]d-1 (3 times a week, for 12 weeks), 3 sets of 10-12 repetitions with a 1-minute rest interval between sets and exercises. Baseline and postintervention differences were analyzed using Generalized Estimating Equations and the effect size (ES) with Cohen's d coefficient. Significance was set at (p < 0.05). After 12 weeks of ST, a significant decrease in the PSQI score (7.3 +/- 0.7 vs. 5.1 +/- 0.6; ES = 4.10) was observed in the ST group, but not in the CG (6.3 +/- 0.8 vs. 7.4 +/- 0.7; ES = 1.53). A significant decrease in ESS score was found in the ST group (10.1 +/- 0.7 vs. 8.2 +/- 0.7; ES = 3.08), without differences in the CG (10.7 +/- 0.8 vs. 11.0 +/- 0.7; ES = 0.56). The ST group presented increased total sleep duration (h[middle dot]min-1) (6.2 +/- 0.2 vs. 6.9 +/- 0.2; ES = 3.60), but not the CG (7.0 +/- 0.2 vs. 6.8 +/- 0.1; ES = 1.32). Individual analyses showed [almost equal to]67% of adolescents experienced a reduction in PSQI (8.3; confidence interval [CI] 95% 6.8-10.1) and ESS (8.3; CI 95% 6.7-9.9) scores after ST, whereas only [almost equal to]17% of control subjects presented reduced scores (PSQI [11.1; CI 95% 9.5-12.9] and ESS [11.0; CI 95% 9.4-12.6]). Strength training improved sleep quality and increased total sleep duration.
