- Title
- The validity and contributing physiological factors to 30-15 intermittent fitness test performance in rugby league
- Creator
- Scott, Tannath J.; Duthie, Grant M.; Delaney, Jace A.; Sanctuary, Colin E.; Ballard, David A.; Hickmans, Jeremy A.; Dascombe, Ben J.
- Relation
- Journal of Strength and Conditioning Research Vol. 31, Issue 9, p. 2409-2416
- Publisher Link
- http://dx.doi.org/10.1519/JSC.0000000000001702
- Publisher
- Lippincott Williams & Wilkins
- Resource Type
- journal article
- Date
- 2017
- Description
- 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, Σ7 skinfolds: 71.0 ± 18.7 mm) from a professional club participated in this study. Players were assessed for anthropometry (body mass, Σ7 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 Σ7 skinfolds, repeated sprint decrement, VO₂maxMSFT, 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 (VO₂maxMSFT, 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 ΔVO₂maxMSFT (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.
- Subject
- high-intensity interval training; testing; team sports; IFT
- Identifier
- http://hdl.handle.net/1959.13/1389157
- Identifier
- uon:32862
- Identifier
- ISSN:1064-8011
- Language
- eng
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