Cardiorespiratory fitness (CRF) is measured as the highest rate of oxygen consumed ( V ˙ O2) during a bout of maximal exercise to voluntary exhaustion, described as V ˙ O2peak in children and youth.1 CRF provides an indication of the function of the cardiovascular and respiratory systems and it provides a strong summative measure of physical health among children and youth.2 Furthermore, youth with low CRF in late adolescence have an increased risk of developing cardiovascular disease in adulthood3 and succumbing to premature mortality.
