Title

Transfer effect of strength and power training to the sprinting kinematics of international rugby players

Document Type

Journal Article

Publisher

Lippincott, Williams and Wilkins

Faculty

Faculty of Health, Engineering and Science

School

Centre for Exercise and Sports Science Research

RAS ID

18613

Comments

This article was originally published as: Barr M.J., Sheppard J.M., Agar-Newman D.J., & Newton R.U. (2014). Transfer effect of strength and power training to the sprinting kinematics of international rugby players. Journal of Strength and Conditioning Research, 28(9), 2585-2596. Original article available here

Abstract

Increasing lower-body strength is often considered to be important for improving the sprinting speed of rugby players. This concept was examined in a group (n = 40) of international rugby players in a 2-part study. The players were tested for body mass (BM), 1 repetition maximum power clean (PC), and front squat, as well as triple broad jump and broad jump. In addition, speed over 40 m was tested, with timing gates recording the 0- to 10-m and 30- to 40-m sections to assess acceleration and maximal velocity. Two video cameras recorded the 2 splits for later analysis of sprinting kinematics. The players were divided into a fast group (n = 20) and a slow group (n = 20) for both acceleration and maximal velocity. In the second part of the study, a group (n = 15) of players were tracked over a 1-year period to determine how changes in strength corresponded with changes in sprinting kinematics. The fast groups for both acceleration and maximal velocity showed greater levels of strength (d = 0.5-1.8), lower ground contact times (d = 0.8-2.1), and longer stride lengths (d = 0.5- 1.3). There was a moderate improvement over 1 year in PC/BM (0.08 kg·kg-1, p = 0.008, d = 0.6), and this had a strong relationship with the change in maximal velocity stride length (r = 0.70). Acceleration stride length also had a large improvement over 1 year (0.09 m, p = 0.003, d = 0.81). Although increasing lower-body strength is likely important for increasing sprinting speed of players with low training backgrounds, it may not have the same effect with highly trained players.

DOI

10.1519/JSC.0000000000000423

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