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• W2548492356 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 (30-15 IFT ) 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 30-15 IFT ), 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 30-15 IFT was established using Pearson's coefficient correlations. Forward stepwise regression model identified the fewest variables that could predict individual final velocity ( V IFT ) and change within 30-15 IFT performance. Significant correlations between V IFT and Σ7 skinfolds, repeated sprint decrement, V̇ o 2 max MSFT , and average aerobic speed were observed. A total of 71.8% of the adjusted variance in 30-15 IFT performance was explained using a 4-step best fit model (V̇ o 2 max MSFT , 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 ΔV̇ o 2 max MSFT ( R 2 = 0.25). These relationships suggest that the 30-15 IFT 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 30-15 IFT is a valid measure of PHIR, it also simultaneously examines various physiological capacities that differ between sporting cohorts." @default.
• W2548492356 created "2016-11-11" @default.
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• W2548492356 date "2017-09-01" @default.
• W2548492356 modified "2023-10-12" @default.
• W2548492356 title "The Validity and Contributing Physiological Factors to 30-15 Intermittent Fitness Test Performance in Rugby League" @default.
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• W2548492356 doi "https://doi.org/10.1519/jsc.0000000000001702" @default.
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