Evaluation of the reliability and validity of a soccer-specific field testof repeated sprint ability

The reliability and validity of a soccer-specific field test of repented sp rint ability was assessed. Seven male games players performed the repeated sprint test on six separate occasions. The temporal pattern of the mean spr int time was analysed by using coefficient of variation with confidence int ervals (CI). and repeated measures ANOVA. A within subject mean coefficient of variation of 1.8% (95% CI, 1.5-2.4) was found for performance in the re peated sprint test across all six trials. The mean coefficient of variation across trials 2-4 was found to be 1.9% (95% CI, 1.3-3.1), compared to tria ls 4-6, where it was 1.4% (95% CI, 1.0-2.3). The ANOVA showed that a signif icant difference was present between the trials (F-6,F-30 9.8, P < 0.001). A Tukey post-hoc test showed that significant differences were present betw een trial 1 and trials 3-6, and trial 2 and trial 5. The learning effect wa s complete by trial 3. Performance in the repeated sprint test was compared to total running time averaged from two repeats of the maximal anaerobic r unning test laboratory protocol. Mean sprint time in the repeated sprint te st and total running time in the laboratory protocol had a correlation coef ficient of r = -0.298 (P = 0.516, n = 7), suggesting that the energetics of the two tests are not closely related. In conclusion, this soccer-specific field test demonstrated high reliability.