Effect of 8 days of a hypergravity condition on the sprinting speed and lower-body power of elite rugby players

Barr, Matthew J., Gabbett, Tim J., Newton, Robert U. and Sheppard, Jeremy M. (2015) Effect of 8 days of a hypergravity condition on the sprinting speed and lower-body power of elite rugby players. Journal of Strength and Conditioning Research, 29 3: 722-729. doi:10.1519/JSC.0000000000000669

Author Barr, Matthew J.
Gabbett, Tim J.
Newton, Robert U.
Sheppard, Jeremy M.
Title Effect of 8 days of a hypergravity condition on the sprinting speed and lower-body power of elite rugby players
Journal name Journal of Strength and Conditioning Research   Check publisher's open access policy
ISSN 1064-8011
Publication date 2015-03-06
Year available 2015
Sub-type Article (original research)
DOI 10.1519/JSC.0000000000000669
Volume 29
Issue 3
Start page 722
End page 729
Total pages 8
Place of publication Philadelphia, PA, United States
Publisher Lippincott Williams & Wilkins
Collection year 2016
Language eng
Formatted abstract
Sprinting speed and lower-body power are considered to be key physical abilities for rugby players. A method of improving the lower-body power of athletes is simulated hypergravity. This method involves wearing a weighted vest at all times during the day for an extended period of time. There are no studies that have examined the effect of hypergravity on speed or the benefit for rugby players. An experimental group (n = 8) and a control group (n = 7) of national team rugby players took part in the study, which consisted of rugby, conditioning, speed, and strength sessions. The experimental group wore a weighted vest equating to 12% of their body mass for 8 days. All players were tested for speed and lower-body power before, 2 days after, and 9 days after the intervention. Speed testing involved the athletes completing 40-m sprints with timing lights and high-speed video cameras assessing acceleration and maximal velocity sprinting kinematics. Lower-body power was assessed using weighted countermovement jumps (CMJs). No group differences were found for sprinting speed at any point. The experimental group displayed a large decrease in acceleration ground contact time (-0.01 ± 0.005 s, d = 1.07) and a moderate increase in 15-kg CMJ velocity (0.07 ± 0.11 m·s-1, d = 0.71). Individual responses showed that players in the experimental group had both negative and positive speed and power responses to the training intervention. Simulated hypergravity for 8 days is likely ineffective at improving sprinting speed while undergoing standard rugby training.
Keyword Acceleration
Maximal sprinting speed
Weighted vest
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Human Movement and Nutrition Sciences Publications
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