24-h movement guidelines and its association with health-related physical fitness in Brazilian adolescents.

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 ( O). 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/ O in both sexes, ST adherence and O, and adherence to all three guidelines and O. Girls showed positive associations between combined PA ​+ ​sleep adherence and HGS, ST ​+ ​sleep and O, 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.