THE EFFECT OF CLIMATE UPON THE VOLUMES OF BLOOD AND OF TISSUE FLUID IN MAN

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Abstract
A group of 10 white laboratory workers on moving to a hot, damp climate for the summer showed on the avg. a small increase in the vols. of both blood and plasma, both absolute and relative to body wt. and to surface area. The avg. change was +5% but the range was from[long dash]6% to +12%. The interstitial fluid, defined as the fluid outside the cells and outside the blood vessels, decreased in the heat 11% on the avg. but the range was from[long dash]34% to +26%. There was no difference between the colored sharecroppers, the white sharecroppers, and the laboratory workers while in Mississippi in respect to plasma vol. per unit of surface area but the interestitial fluid vol. was 25% higher in the Negroes than it was in the white share-croppers or the white laboratory workers.