Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2013) 12, 565 - 570

Research article
Effect of Pre-Cooling on Repeat-Sprint Performance in Seasonally Acclimatised Males During an Outdoor Simulated Team-Sport Protocol in Warm Conditions
Carly J. Brade , Brian T. Dawson, Karen E. Wallman
Author Information
University of Western Australia, Crawley, WA, Australia

Carly J. Brade
‚úČ School of Sport Science, Exercise and Health, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
Email: bradec01@student.uwa.edu.au
Publish Date
Received: 12-12-2012
Accepted: 01-07-2013
Published (online): 01-09-2013
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ABSTRACT

Whether precooling is beneficial for exercise performance in warm climates when heat acclimatised is unclear. The purpose of this study was to determine the effect of precooling on repeat-sprint performance during a simulated team-sport circuit performed outdoors in warm, dry field conditions in seasonally acclimatised males (n = 10). They performed two trials, one with precooling (PC; ice slushy and cooling jacket) and another without (CONT). Trials began with a 30-min baseline/cooling period followed by an 80 min repeat-sprint protocol, comprising 4 x 20-min quarters, with 2 x 5-min quarter breaks and a 10-min half-time recovery/cooling period. A clear and substantial (negative; PC slower) effect was recorded for first quarter circuit time. Clear and trivial effects were recorded for overall circuit time, third and fourth quarter sprint times and fourth quarter best sprint time, otherwise unclear and trivial effects were recorded for remaining performance variables. Core temperature was moderately lower (Cohen's d=0.67; 90% CL=-1.27, 0.23) in PC at the end of the precooling period and quarter 1. No differences were found for mean skin temperature, heart rate, thermal sensation, or rating of perceived exertion, however, moderate Cohen's d effect sizes suggested a greater sweat loss in PC compared with CONT. In conclusion, repeat- sprint performance was neither clearly nor substantially improved in seasonally acclimatised players by using a combination of internal and external cooling methods prior to and during exercise performed in the field in warm, dry conditions. Of practical importance, precooling appears unnecessary for repeat-sprint performance if athletes are seasonally acclimatised or artificially acclimated to heat, as it provides no additional benefit.

Key words: Cooling jacket, ice slushy, core temperature, 20 m sprint


           Key Points
  • Pre-cooling did not improve repeated sprint performance during a prolonged team-sport circuit in field conditions.
  • If individuals are already heat acclimatised/acclimated, pre-cooling is unnecessary for performance enhancement.
  • Acclimation/acclimatisation seems to be the more powerful method for protecting against heat strain.
 
 
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