Independent and Combined Influence of the Components of Physical Fitness on Academic Performance in Youth

oup* the components of physical fitness withGPA Grade point averageStudy design This cross-sectional study included a total of 2038 youths (989 girls) aged 6-18 years. Cardiorespi-ratory capacity wasmeasured using the 20-m shuttle run test. Motor ability was assessed with the 4 10-m shuttle run test of speed of movement, agility, and coordination. A muscular strength z-score was computed based on handgrip strength and standing long jump distance. Academic performance was assessed through school records using 4 indicators: Mathematics, Language, an average of Mathematics and Language, and grade point average score. ResultsCardiorespiratory capacity andmotor ability were independently associatedwith all academic variables in youth, even after adjustment for fitness and fatness indicators (all P #.001), whereas muscular strength was not associated with academic performance independent of the other 2 physical fitness components. In addition, the combined adverse effects of low cardiorespiratory capacity and motor ability on academic performance were observed across the risk groups (P for trend <.001). Conclusion Cardiorespiratory capacity and motor ability, both independently and combined, may have a bene-ficial influence on academic performance in youth. (J Pediatr 2014;165:306-12).