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Cell Stress and Chaperones : Volume 13, Issue 1, March 2008

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

Content Provider	Springer Nature Link
Author	Sandström, Marie E. Siegler, Jason C. Lovell, Ric J. Madden, Leigh A. McNaughton, Lars
Copyright Year	2008
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 (VO$_{2}$max = 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 VO$_{2}$max 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.
Starting Page	169
Ending Page	175
Page Count	7
File Format	PDF
ISSN	13558145
Journal	Cell Stress and Chaperones
Volume Number	13
Issue Number	2
e-ISSN	14661268
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-02-19
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Hsp70 Heat acclimation Exercise Marathon Des Sables Cancer Research Immunology Biochemistry Cell Biology Biomedicine general
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry

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

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

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

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