24?hour movement behaviors and fitness in preschoolers: A compositional and isotemporal reallocation analysis

This study analyzed the associations between 24-hour movement behaviors composition and fitness in preschoolers investigated predicted changes when time active is reallocated. cross-sectional was carried out with 270 (132 boys; 3.97 ± 0.80 years-old). Light moderate-to-vigorous physical activity (LPA MVPA), sedentary behavior (SB) were verified using an accelerometer. Sleep obtained through interviews parents. Components of (cardiorespiratory fitness—CRF, speed-agility, lower-body muscular strength) assessed PREFIT Battery. To verify association fitness, compositional analysis used, for reallocation, isotemporal substitution used MVPA). The daily composition, adjusted body mass index, sex, age, significantly associated CRF (P = .007; r2 0.29), speed-agility < .001; 0.14), strength .01; 0.07). For CRF, addition MVPA, at expense any other behavior, significant improvements. strength, only reallocations sleep LPA yielded associations. variation 24 hours reallocating 5, 10 or 15 minutes SB MVPA positive .05). present findings highlight relevance decreasing increasing practice, particularly high intensities, to promote a better profile preschoolers.