The validity and contributing physiological factors to 30-15 intermittent fitness test performance in Rugby League

Journal article


Scott, Tannath J., Duthie, Grant M., Delaney, Jace A., Sanctuary, Colin E., Ballard, David A., Hickmans, Jeremy A. and Dascombe, Ben. (2017) The validity and contributing physiological factors to 30-15 intermittent fitness test performance in Rugby League. Journal of Strength and Conditioning Research. 31(9), pp. 2409 - 2416. https://doi.org/10.1519/JSC.0000000000001702
AuthorsScott, Tannath J., Duthie, Grant M., Delaney, Jace A., Sanctuary, Colin E., Ballard, David A., Hickmans, Jeremy A. and Dascombe, Ben
Abstract

Abstract: Scott, TJ, Duthie, GM, Delaney, JA, Sanctuary, CE, Ballard, DA, Hickmans, JA, and Dascombe, BJ. The validity and contributing physiological factors to 30-15 intermittent fitness test performance in rugby league. J Strength Cond Res 31(9): 2409-2416, 2017-This study examined the validity of the 30-15 Intermittent Fitness Test (30-15IFT) within rugby league. Sixty-three Australian elite and junior-elite rugby league players (22.5 +/- 4.5 years, 96.1 +/- 9.5 kg, [SIGMA]7 skinfolds: 71.0 +/- 18.7 mm) from a professional club participated in this study. Players were assessed for anthropometry (body mass, [SIGMA]7 skinfolds, lean mass index), prolonged high-intensity intermittent running (PHIR; measured by 30-15IFT), predicted aerobic capacity (MSFT) and power (AAS), speed (40 m sprint), repeated sprint, and change of direction (COD-505 agility test) ability before and after an 11-week preseason training period. Validity of the 30-15IFT was established using Pearson's coefficient correlations. Forward stepwise regression model identified the fewest variables that could predict individual final velocity (VIFT) and change within 30-15IFT performance. Significant correlations between VIFT and [SIGMA]7 skinfolds, repeated sprint decrement, V[Combining Dot Above]O2maxMSFT, and average aerobic speed were observed. A total of 71.8% of the adjusted variance in 30-15IFT performance was explained using a 4-step best fit model (V[Combining Dot Above]O2maxMSFT, 61.4%; average aerobic speed, 4.7%; maximal velocity, 4.1%; lean mass index, 1.6%). Across the training period, 25% of the variance was accounted by [DELTA]V[Combining Dot Above]O2maxMSFT (R2 = 0.25). These relationships suggest that the 30-15IFT is a valid test of PHIR within rugby league. Poor correlations were observed with measures of acceleration, speed, and COD. These findings demonstrate that although the 30-15IFT is a valid measure of PHIR, it also simultaneously examines various physiological capacities that differ between sporting cohorts.

Keywordsintensity interval training; testing; team sports
Year2017
JournalJournal of Strength and Conditioning Research
Journal citation31 (9), pp. 2409 - 2416
PublisherNSCA National Strength and Conditioning Association
ISSN1064-8011
Digital Object Identifier (DOI)https://doi.org/10.1519/JSC.0000000000001702
Scopus EID2-s2.0-85028669561
Page range2409 - 2416
Research GroupSports Performance, Recovery, Injury and New Technologies (SPRINT) Research Centre
Place of publicationUnited States of America
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