Reliability and usefulness of the 30-15 intermittent fitness test in rugby league

This study examined the reliability and usefulness of the 30-15 Intermittent Fitness Test (30-15 IFT) within rugby league. Fifty-five young rugby league players participated in the study. These included representative players from Under 16s (n 19; 15.6 ± 0.3 years; 78.1 ± 10.9 kg), Under 18s (n 21; 17.4 ± 0.5 years; 86.9 ± 11.2 kg), and Under 20s (n 15; 19.4 ± 0.5 years; 95.9 ± 8.7 kg) squads within a professional rugby league club. Players performed the 30-15 IFT twice within 9 days of each other. Maximal intermittent running velocity (V IFT) and heart rate at exhaustion (HR peak) were collected for both tests. Intraclass correlation coefficients (ICCs) for the "Combined" and Under 20s were very large (r > 0.7), whereas the ICCs for Under 16s and Under 18s were almost perfect (r > 0.9). Coefficients of variation were 1.9% (95% confidence interval, 1.6-2.4) for the combined test-retest of the 30-15 IFT and 0.6% (0.5-1.0) for HR peak. As the typical error of measurement (TE) (0.36 km·h -1) was greater than the smallest worthwhile change (SWC) (0.21 km·h -1) value, the usefulness of the V IFT was rated as "marginal." The TE for HR peak was similar to the SWC, rating the usefulness of this variable as "OK." Despite the usefulness of the 30-15 IFT being deemed Marginal, a change as small as 0.5 km·h -1 (1 stage) in V IFT could be considered substantial or "real." As a consequence, the 30-15 IFT presents as both a reliable and useful field test in the assessment of intermittent fitness for rugby league players.