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

Barr, Matthew J. and Gabbett, Tim J. and 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). pp. 722-729. ISSN 1064-8011

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.


Statistics for USQ ePrint 32297
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version cannot be displayed due to copyright restrictions.
Faculty / Department / School: No Faculty
Date Deposited: 25 May 2017 02:59
Last Modified: 25 May 2017 02:59
Uncontrolled Keywords: acceleration; maximal sprinting speed; weighted vest; acceleration; athletic performance; case-control studies; exercise test; football; humans; hypergravity; lower extremity; male; muscle strength; running; young adult
Fields of Research : 11 Medical and Health Sciences > 1106 Human Movement and Sports Science > 110699 Human Movement and Sports Science not elsewhere classified
Socio-Economic Objective: C Society > 92 Health > 9299 Other Health > 929999 Health not elsewhere classified
Identification Number or DOI: 10.1519/JSC.0000000000000669
URI: http://eprints.usq.edu.au/id/eprint/32297

Actions (login required)

View Item Archive Repository Staff Only