Crossvalidation of Two 20-M Shuttle-Run Tests for Predicting V[Combining Dot Above]O2max in Female Collegiate Soccer Players

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Nutrition Exercise and Health Sciences

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Green, MS, Esco, MR, Martin, TD, Pritchett, RC, McHugh, AN, and Williford, HN. Crossvalidation of two 20-M shuttle-run tests for predicting V[Combining Dot Above]O2max in female collegiate soccer players. J Strength Cond Res 27(6): 1520–1528, 2013—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[Combining Dot Above]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[Combining Dot Above]O2max. In addition, V[Combining Dot Above]O2max was predicted from the MAS obtained during MST (predV[Combining Dot Above]O2maxMST) and SST (predV[Combining Dot Above]O2maxSST) using previously developed equations. Measured V[Combining Dot Above]O2max 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[Combining Dot Above]O2maxMST of 49.6 ± 3.9 ml·kg−1·min−1 and predV[Combining Dot Above]O2maxSST of 41.8 ± 3.1 ml·kg−1·min−1, which were significantly different from measured V[Combining Dot Above]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[Combining Dot Above]O2maxMST and predV[Combining Dot Above]O2maxSST: 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 = −2.43 ± 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[Combining Dot Above]O2max than MST in the group of athletes.


This article was originally published in Journal of Strength and Conditioning Research. The full-text article from the publisher can be found here.

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