Lactate Content in Sweat

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Abstract
Åstrand, I. Lactate content in sweat. Acta physiol. scand. 1963. 58. 359—367. — Four subjects were heated by means of physical exercise in different room temperatures or with hot baths in order to bring about sweating. The sweat was collected in plastic bags from the extremities in at least 3 consecutive 15 min periods and analysed for the content of lactate and chloride. In some experiments the blood circulation was occluded with a blood pressure cuff. The lactate concentration was significantly higher during cycling than bathing and significantly higher during the first period as compared to the following. The lactate concentration rose during occlusion of the circulation. Mc secretion of lactate per minute was rectilinearly correlated to the sweating rate and to the chloride secretion. The first period of cycling revealed, however, significantly different values from the others in this respect. The results are discussed with regard to degradation of glycogen to lactate in the sweat glands, to diffusion of lactate into the blood, to reabsorption, intensity of the sweating stimulus and to the content of lactate in the epidermis.

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