Loading...
Reliability and usefulness of the 30-15 intermittent fitness test in Rugby League
Scott, Tannath J. Delaney, Jace A. Duthie, Grant M. Sanctuary, Colin E. Ballard, David A. Hickmans, Jeremy A. Dascombe, Ben J.
Scott, Tannath J.
Delaney, Jace A.
Duthie, Grant M.
Sanctuary, Colin E.
Ballard, David A.
Hickmans, Jeremy A.
Dascombe, Ben J.
Abstract
Reliability and usefulness of the 30-15 Intermittent Fitness Test in rugby league. J Strength Cond Res 29(7): 1985–1990, 2015—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.
Keywords
testing, maximum heart rate, team sports
Date
2015
Type
Journal article
Journal
Journal of Strength and Conditioning Research
Book
Volume
29
Issue
7
Page Range
1985-1990
Article Number
ACU Department
School of Behavioural and Health Sciences
Faculty of Health Sciences
Faculty of Health Sciences
Relation URI
Source URL
Event URL
Open Access Status
License
File Access
Controlled