Assessing lower-body peak power in elite rugby-union players

Christos K Argus, Nicholas D Gill, Justin W L Keogh, Will G Hopkins

Research output: Contribution to journalArticleResearchpeer-review

20 Citations (Scopus)
147 Downloads (Pure)

Abstract

Resistance training at the load that maximizes peak power (Pmax) may produce greater increases in peak power than other loads. Pmax for lower-body lifts can occur with no loading but whether Pmax can be increased further with negative loading is unclear. The purpose of this investigation was therefore to determine lower-body Pmax (jump squat) using a spectrum of loads. Box squat 1 repetition maximum (1RM) was measured in 18 elite rugby-union players. Pmax was then determined using loads of -28 to 60%1RM. Elastic bands were used to unload body weight for negative loads. Jump squat Pmax occurred with no loading (body weight: 8,880 ± 2,186 W) in all but 2 subjects. There was a discontinuity in the power-load relationship for the jump squat, possibly because of the increased countermovement in the body weight jump. The self-selected depth (dip) before the propulsive phase of the jump was greater by 24 ± 11 to 40 ± 16% (moderate to large effect size) than all positive loads. These findings highlight methodological issues that need to be taken into consideration when comparing power outputs of loaded and unloaded jumps.

Original languageEnglish
Pages (from-to)1616-21
Number of pages6
JournalJournal of Strength and Conditioning Research
Volume25
Issue number6
DOIs
Publication statusPublished - Jun 2011

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