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To the Editor:—
I was attracted by the letter in The Journal, July 24, from the London correspondent in regard to "Salt and Water Requirements in Hot Climates." Take the figures quoted from the Army Medical Department bulletin that in hot countries a man on exercise excretes from 5 to 8 liters of sweat and needs not over 25 Gm. salt unless the sweat exceeds 2 gallons (Imperial measure, I presume) or a little over 9.5 liters. Sweat is hypotonic. Consequently when a liter is excreted there would be but for the kidney a hypertonic condition in the intracellular fluids. The kidney, however, guards the salt concentration zealously and excretes sufficient salt to keep the fluids isotonic. The net result of losing a liter of sweat is that of losing a liter of isotonic solution containing 8.5 Gm. of salt. If a man is to lose but 5 liters of
Hibbard RJB. SALT REQUIREMENTS IN HOT CLIMATES'. JAMA. 1943;122(17):1204. doi:10.1001/jama.1943.02840340052022
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