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This Article Full Text Free Full Text (PDF) Free All Versions of this Article: 103/3/990    most recent 00015.2007v1 Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (6) Citing Articles via Google Scholar Google Scholar Articles by Buono, M. J. Articles by Kolkhorst, F. W. Search for Related Content PubMed PubMed Citation Articles by Buono, M. J. Articles by Kolkhorst, F. W.

Sodium ion concentration vs. sweat rate relationship in humans

School of Exercise and Nutritional Sciences, San Diego State University, San Diego, California

Submitted 3 January 2007 ; accepted in final form 26 June 2007

The purpose of this study was to determine the effect of active heat acclimation on the sweat osmolality and sweat sodium ion concentration vs. sweat rate relationship in humans. Eight healthy male volunteers completed 10 days of exercise in the heat. The mean exercising heart rate and core temperature were significantly decreased (P < 0.05) by 18 beats/min and 0.6°C, respectively, following heat acclimation. Furthermore, sweat osmolality and the sweat sodium ion concentration vs. sweat rate relationships were shifted to the right. Specifically, the slopes of the relationships were not affected by heat acclimation. Rather, heat acclimation significantly reduced the y-intercepts of the sweat osmolality and sweat sodium relationships with sweat rate by 28 mosmol/kgH₂O and 15 mmol/l, respectively. Thus there was a significantly lower sweat sodium ion concentration for a given sweat rate following heat acclimation. These results suggest that heat acclimation increases the sodium ion reabsorption capacity of the human eccrine sweat gland.

heat acclimation; sweat rate; sweat osmolality; sweat sodium ion concentration

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