The effect of body mass on the 30-15 intermittent fitness test in rugby union players

Journal article


Darrall-Jones, Joshua David, Roe, Gregory A. B., Carney, Shane, Clayton, Ryan, Phibbs, Padraic J., Read, Dale B., Weakley, Jonathon, Till, Kevin and Jones, Ben. (2016). The effect of body mass on the 30-15 intermittent fitness test in rugby union players. International Journal of Sports Physiology and Performance. 11(3), pp. 400 - 403. https://doi.org/10.1123/ijspp.2015-0231
AuthorsDarrall-Jones, Joshua David, Roe, Gregory A. B., Carney, Shane, Clayton, Ryan, Phibbs, Padraic J., Read, Dale B., Weakley, Jonathon, Till, Kevin and Jones, Ben
Abstract

Purpose: To evaluate the difference in performance of the 30-15 Intermittent Fitness Test (30–15IFT) across 4 squads in a professional rugby union club in the UK and consider body mass in the interpretation of the end velocity of the 30-15IFT (VIFT). Methods: One hundred fourteen rugby union players completed the 30-15IFT midseason. Results: VIFT demonstrated small and possibly lower (ES = –0.33; 4/29/67) values in the under 16s compared with the under 21s, with further comparisons unclear. With body mass included as a covariate, all differences were moderate to large and very likely to almost certainly lower in the squads with lower body mass, with the exception of comparisons between senior and under-21 squads. Conclusions: The data demonstrate that there appears to be a ceiling to the VIFT attained in rugby union players that does not increase from under-16 to senior level. However, the associated increases in body mass with increased playing level suggest that the ability to perform high-intensity running increases with age, although not translating into greater VIFT due to the detrimental effect of body mass on change of direction. Practitioners should be aware that VIFT is unlikely to improve, but it needs to be monitored during periods where increases in body mass are evident.

Keywordshigh-intensity running; training; evaluation; adolescent
Year2016
JournalInternational Journal of Sports Physiology and Performance
Journal citation11 (3), pp. 400 - 403
PublisherHuman Kinetics, Inc.
ISSN1555-0265
Digital Object Identifier (DOI)https://doi.org/10.1123/ijspp.2015-0231
Scopus EID2-s2.0-84963865183
Page range400 - 403
Research GroupSchool of Behavioural and Health Sciences
Publisher's version
File Access Level
Controlled
Place of publicationUnited States of America
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