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The effect of 15 consecutive days of heat–exercise acclimation on heat shock protein 70

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Cell Stress and Chaperones Aims and scope

Abstract

The purpose of this study was to investigate the alterations in serum heat shock protein (Hsp) 70 levels during a 15-consecutive-day intermittent heat–exercise protocol in a 29-year-old male ultra marathon runner. Heat acclimation, for the purpose of physical activities in elevated ambient temperatures, has numerous physiological benefits including mechanisms such as improved cardiac output, increased plasma volume and a decreased core temperature (T c). In addition to the central adaptations, the role of Hsp during heat acclimation has received an increasing amount of attention. The acclimation protocol applied was designed to correspond with the athlete’s tapering period for the 2007 Marathon Des Sables. The subject (VO2max = 50.7 ml·kg−1·min−1, peak power output [PPO] = 376 W) cycled daily for 90 min at a workload corresponding to 50% of VO2max in a temperature-controlled room (average WBGT = 31.9 ± 0.9°C). Venous blood was sampled before and after each session for measurement of serum osmolality and serum Hsp70. In addition, T c, heart rate (HR) and power output (PO) was measured throughout the 90 min to ensure that heat acclimation was achieved during the 15-day period. The results show that the subject was successfully heat acclimated as seen by the lowered HR at rest and during exercise, decreased resting and exercising T c and an increased PO. The heat exercise resulted in an initial increase in Hsp70 concentrations, known as thermotolerance, and the increase in Hsp70 after exercise was inversely correlated to the resting values of Hsp70 (Spearman’s rank correlation = −0.81, p < 0.01). Furthermore, the 15-day heat–exercise protocol also increased the basal levels of Hsp70, a response different from that of thermotolerance. This is, as far as we are aware, the first report showing Hsp70 levels during consecutive days of intermittent heat exposure giving rise to heat acclimation. In conclusion, a relatively longer heat acclimation protocol is suggested to obtain maximum benefit of heat acclimation inclusive of both cellular and systemic adaptations.

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Acknowledgments

The authors would like to thank our subject, Paul Barett, for his participation and David Hildreth for his assistance conducting this study.

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Authors and Affiliations

  1. Department of Sport, Health and Exercise Science, University of Hull, Cottingham Road, Hull, HU6 7RX, UK

    Marie E. Sandström, Jason C. Siegler, Ric J. Lovell, Leigh A. Madden & Lars McNaughton

  2. Post Graduate Medical Institute and Institute of Clinical Biosciences, University of Hull, Hull, UK

    Leigh A. Madden

Authors
  1. Marie E. Sandström
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  2. Jason C. Siegler
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  3. Ric J. Lovell
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  4. Leigh A. Madden
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  5. Lars McNaughton
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Correspondence to Marie E. Sandström.

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Sandström, M.E., Siegler, J.C., Lovell, R.J. et al. The effect of 15 consecutive days of heat–exercise acclimation on heat shock protein 70. Cell Stress and Chaperones 13, 169–175 (2008). https://doi.org/10.1007/s12192-008-0022-8

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  • DOI: https://doi.org/10.1007/s12192-008-0022-8

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