Sports Medicine

, Volume 41, Issue 9, pp 757–771 | Cite as

Induction and Decay of Short-Term Heat Acclimation in Moderately and Highly Trained Athletes

  • Andrew T. Garrett
  • Nancy J. Rehrer
  • Mark J. Patterson
Review Article


A rethinking of current heat-acclimation strategies is required as most research and advice for improving physiological strain in the heat includes maintaining hydration using long-term acclimation protocols (>10 days). Furthermore, these strategies have tended to use untrained and moderately trained participants. Therefore, the aims of this review were to (i) investigate the effectiveness of short-term heat acclimation (STHA) with moderately and highly trained athletes; (ii) determine the importance of fluid regulatory strain, which has a thermally independent role in heat adaptation; (iii) assess the impact of STHA on a marker of thermotolerance (inducible heat-shock protein 70 [HSP70]); and (iv) provide further information on the decay of acclimation to heat. The review suggests that 5-day STHA is effective, and adaptations may be more pronounced after fluid regulatory strain from a dehydration-acclimation regimen. Furthermore, highly trained athletes may have similar physiological gains to those who are less trained using STHA. However, research has tended to focus on untrained or moderately trained participants and more information is required for highly trained populations. HSP70 response is upregulated across STHA. This indicates increased thermotolerance and protective adaptive change that may indicate HSP70 response as a useful marker of heat acclimation. Physiological adaptations after heat acclimation are relatively short term and may vanish only a few days or weeks after removal from heat exposure. From a practical perspective 5-day STHA may be the preferred acclimation regimen for moderately and highly trained athletes as it has been shown to be effective, less expensive and less likely to disrupt the tapering for competition in elite performers. Furthermore, updated information on the time course of acclimation decay may allow a reliable estimate of how long individuals can be free from heat exposure before reacclimation is required. This is particularly pertinent in present times as many athletes, civilians andmilitary personnel increasingly have to relocate to different climates of the world, often within a short period of time.


Heat Stress Rectal Temperature Aerobic Fitness Heat Exposure Trained Athlete 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This review was supported by grants from the Australian Defence Science Technology Organisation, Melbourne, VIC, Australia, and the School of Physical Education, the University of Otago, Dunedin, New Zealand. The authors thank James Cotter for his contribution to the concepts discussed in this review.

The authors have no conflicts of interest that are directly relevant to the content of this review.


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Authors and Affiliations

  • Andrew T. Garrett
    • 1
  • Nancy J. Rehrer
    • 1
  • Mark J. Patterson
    • 2
  1. 1.School of Physical EducationUniversity of OtagoDunedinNew Zealand
  2. 2.Defence Science Technology Organisation (DSTO)MelbourneAustralia

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