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The Validity and Contributing Physiological Factors to 30-15 Intermittent Fitness Test Performance in Rugby League
- Source :
- Journal of strength and conditioning research. 31(9)
- Publication Year :
- 2016
-
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.
- Subjects :
- Adult
Male
intensity interval training
Physical fitness
Acceleration
Football
Physical Therapy, Sports Therapy and Rehabilitation
030204 cardiovascular system & hematology
Athletic Performance
Body Mass Index
Running
03 medical and health sciences
Young Adult
0302 clinical medicine
Statistics
Humans
Orthopedics and Sports Medicine
Body Weights and Measures
Exercise
Aerobic capacity
Mathematics
business.industry
Australia
Reproducibility of Results
030229 sport sciences
General Medicine
Stepwise regression
Anthropometry
testing
Sprint
Athletes
Physical Fitness
Lean body mass
Exercise Test
team sports
business
Body mass index
Subjects
Details
- ISSN :
- 15334287
- Volume :
- 31
- Issue :
- 9
- Database :
- OpenAIRE
- Journal :
- Journal of strength and conditioning research
- Accession number :
- edsair.doi.dedup.....4f7955f8b00edea911bc446b5e11d1c5