On the Regulation of Sweat Secretion in Exercise

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Abstract
Nielsen B. and M. Nielsen. On the regulation of sweat secretion in exercise. Acta physiol. scand. 1965. 64. 314–322. – With exception of the first few minutes of muscular exercise, the sweat rate both in the work and the recovery period was found to follow closely the changes in deep esophageal and tympanic temperatures. – In the steady state of work of various intensities, performed at a constant environmental temperature the mean skin temperature remained constant, whereas there was a linear relationship between sweat rate and internal temperatures measured as rectal, esophageal and tympanic temperatures. In the steady state of work of constant intensity but at various environmental temperatures (5° C to 30° C) the internal temperatures (rectal, esophageal and tympanic) remained constant, and the sweat rate (150 to 750 g per hr) increased nearly linearly with increasing mean skin temperature. The mean skin temperature was, however, even at 30° C amb. temp, lower than that at which sweating was elicited in rest. – Elimination of the temperature gradient along the esophagus by breathing air saturated with water vapor at body temperature had no effect on either sweat rate, or tympanic and other internal temperatures. The effect of vigorous cooling of the neck over the carotid arteries was only small.

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