The Nature of the Insensible Perspiration

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Abstract
The nature of the insensible persplration was studied with special technique separating the loss by the skin from the loss by the lungs, and analyzing the loss from the lungs. The total insensible loss in weight of the average woman, resting quietly, is about 20-30 gm. per hr., that of the average man nearer 40 gm. per hr. Of this about 45% is in water from the skin, about 45% is in water from the lungs, and 10% represents the difference between the intake of O and the output of CO2. The effects of the removal of clothing, of wind movement, and of temp. below the point at which visible persplration occurs are astonishingly small, chiefly because the skin temp. is so profoundly lowered by such measures. The total insensible loss is a reliable index of the total metabolism and is finding use in modern clinics. Some of the most important factors affecting the losses from the skin and from the lungs are the volume of insplred air, its humidity and temp., and the temp. of the explred air. Special techniques have been developed and it is believed that a more exact analysis of the factors influencing not only resplration but the insensible persplration will be attained.

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