Critical velocity as a measure of aerobic fitness in women's rugby sevens

ObjectivesTo compare a field-based critical velocity running test to routine laboratory (treadmill VO2 max test) and field-based (Yo-Yo intermittent recovery test, Yo-Yo IR1) aerobic fitness tests in women's rugby sevens (7's) players. To quantify the degree of association between field-based fitness test scores and GPS-derived analysis of performance data in competition.DesignSingle cohort, cross-sectional study involving 22 female Australian Rugby 7's National team players.MethodsPlayers underwent fitness testing comparing the critical velocity test (100 m, 400 m, 1500 m runs) to the Yo-Yo IR1 and a treadmill VO2 max test. GPS data was obtained during the National Championships using a subgroup of 12 players and compared with each player's fitness test scores.ResultsThe critical velocity test was highly correlated with the Yo-Yo IR1 test (r = 0.86, 0.69–0.94; 90% confidence interval) and all variables of the VO2 max test, however mean values were substantially different between tests (Yo-Yo IR1: 4.3 ± 0.1 m s−1, vVO2 max: 3.7 ± 0.3 m s−1, critical velocity: 3.2 ± 0.3 m s−1). Average speed, obtained from GPS data, was largely correlated with both the Yo-Yo IR1 (r = 0.62, 0.10–0.87) and critical velocity (r = 0.51, −0.06–0.83) tests. Total game distance correlated moderately with the Yo-Yo IR1 (r = 0.49, −0.09–0.82) and critical velocity (r = 0.36, −0.25–0.76).ConclusionsThe critical velocity test is an appropriate aerobic fitness test, yields results similar to the Yo-Yo IR1, and correlates moderately with rugby 7's game data. However the Yo-Yo IR1 and critical velocity test scores cannot be used interchangeably.