The 20 m shuttle run is not a valid test of cardiorespiratory fitness in boys aged 11–14 years

The 20 m shuttle run test (20mSRT) is used to estimate cardiorespiratory fitness (CRF) through the prediction of peak oxygen uptake ( V˙O2 ), but its validity as a measure of CRF during childhood and adolescence is questionable. This study examined the validity of the 20mSRT to predict peak V˙O2 .Peak V˙O2 was measured during treadmill running. Log-linear regression was used to correct peak V˙O2 for body mass and sum of skinfolds plus age. Boys...