Abstract
PURPOSE: To examine the link between adherence to 24-h movement guidelines (isolated and combined) and muscular strength, cardiorespiratory fitness, and obesity indicators in Brazilian adolescents. METHODS: Data from 980 adolescents (14-19 years) in Florianópolis, Brazil, were analyzed. The dependent variables were body mass index (BMI), body fat, handgrip strength (HGS), maximal oxygen consumption ( V˙ O(2max)). The independent variables were physical activity (PA, IPAQ), screen time (ST), sleep (bedtime, wake-up time). Compliance was calculated for each behavior and combinations. Multiple linear regression models were employed. RESULTS: Overall compliance: 4.1% (boys), 4.9% (girls). Positive associations were found between PA adherence and HGS/ V˙ O(2max) in both sexes, ST adherence and V˙ O(2max), and adherence to all three guidelines and V˙ O(2max). Girls showed positive associations between combined PA + sleep adherence and HGS, ST + sleep and V˙ O(2max), and negative associations between adherence to two guidelines and BMI. Boys exhibited a negative association between PA and body fat, positive between ST and HGS, and positive/negative between combined PA + ST adherence and HGS/body fat. Moreover, adherence to all three guidelines associated positively with HGS. CONCLUSION: Adhering to 24-h movement guidelines, alone or in combination, benefits muscular strength and cardiorespiratory fitness in Brazilian adolescents. However, simultaneous adherence did not correlate with obesity indicators.