Reliability and Usefulness of the 30-15 Intermittent Fitness Test in Rugby League

• Autores: Tannath J. Scott, Jace A. Delaney, Grant M. Duthie, Colin E. Sanctuary, David A. Ballard, Jeremy A. Hickmans, Benjamin J. Dascombe
• Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 29, Nº. 7, 2015, págs. 1985-1990
• Idioma: inglés
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• Dialnet Métricas: 2 Citas
• Resumen

  • This study examined the reliability and usefulness of the 30-15 Intermittent Fitness Test (30-15IFT) 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 30-15IFT twice within 9 days of each other. Maximal intermittent running velocity (VIFT) and heart rate at exhaustion (HRpeak) 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 30-15IFT and 0.6% (0.5�1.0) for HRpeak. 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 VIFT was rated as �marginal.� The TE for HRpeak was similar to the SWC, rating the usefulness of this variable as �OK.� Despite the usefulness of the 30-15IFT being deemed Marginal, a change as small as 0.5 km·h-1 (1 stage) in VIFT could be considered substantial or �real.� As a consequence, the 30-15IFT presents as both a reliable and useful field test in the assessment of intermittent fitness for rugby league players.