Crossvalidation of two 20-m shuttle-run tests for predicting V?O 2max in female collegiate soccer players

摘要

The aim of this study was twofold: (a) to compare the maximal attained speed (MAS) from the 20-m shuttle (MST) and 20-m square-shuttle (SST) tests and (b) to crossvalidate 2 equations for predicting maximal oxygen consumption (V?O2max) that were previously developed from MST and SST in a group of female collegiate soccer players. Thirty-nine subjects (age: 20.1 ± 1.5 years) participated in the study. A maximal graded exercise treadmill test was used to measure V?O2max. In addition, V?O2max was predicted from the MAS obtained during MST ( predV?O2maxMST) and SST (predV?O 2maxSST) using previously developed equations. Measured V?O 2max for the group was 44.2 ± 3.3 ml.kg-1.min -1. The MAS was 12.5 ± 0.6 km.h-1 for MST and 13.3 ± 0.8 km.h-1 for SST (p 0.05). The prediction methods yielded a predV?O2maxMST of 49.6 ± 3.9 ml.kg-1.min-1 and predV?O2maxSST of 41.8 ± 3.1 ml.kg-1.min-1, which were significantly different from measured V?O2max (p 0.05). The validity statistics revealed the following constant error (CE), correlation coefficient (r), standard error of estimate (SEE), and total error (TE) for predV?O2maxMST and predV?O 2maxSST: CE = 5.35 ± 3.83, r = 0.45 (p 0.05), SEE = 2.97 ml.kg-1.min-1, TE = 6.39 ml.kg-1.min -1; and CE = 22.43 ± 2.49, r = 0.69 (p 0.05), SEE = 2.39 ml.kg-1.min-1, TE = 3.43 ml.kg-1.min -1, respectively. Residual plots indicated no proportional bias for either prediction model. The results of this study suggest that female collegiate soccer players had a higher MAS from SST compared with that from MST. In addition, SST appeared to be a more accurate predictor of V?O 2max than MST in the group of athletes.