Crossvalidation of Two 20-M Shuttle-Run Tests for Predicting V̇O2max in Female Collegiate Soccer Players

Document Type


Department or Administrative Unit

Nutrition Exercise and Health Sciences

Publication Date



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 (V̇O2max) 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 V̇O2max. In addition, V̇O2max was predicted from the MAS obtained during MST (predV̇O2maxMST) and SST (predV̇O2maxSST) using previously developed equations. Measured V̇O2max 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 predV̇O2maxMST of 49.6 ± 3.9 ml·kg−1·min−1 and predV̇O2maxSST of 41.8 ± 3.1 ml·kg−1·min−1, which were significantly different from measured V̇O2max (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 predV̇O2maxMST and predV̇O2maxSST: 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 V̇O2max 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.

Due to copyright restrictions, this article is not available for free download from ScholarWorks @ CWU.


Journal of Strength and Conditioning Research


Copyright © 2013 by the National Strength & Conditioning Association.