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Nippon Eiyo Shokuryo Gakkaishi (J. Jpn. Soc. Nutr. Food Sci.) 46, 39~46 (1993) A study was designed to determine whether the increased sweat sodium (Na) and potassium (K) losses induced by moderate or heavy exercise are compensated for by a decrease in their urinary excretion within 9h. Five healthy men served as the subjects. The experiment consisted of four consecutive days: pre-control day, control day (C), moderate exercise day (ME) and heavy exercise day (HE). Exercise was loaded for 40min with a bicycle ergometer at a target intensity of 60% or 80% of VO2max during the exercise period (from 9:00 to 11:00) on both the ME and HE. During the exercise period, sweat Na and K excretions were increased, especially on the HE. Urinary Na excretion was decreased, especially on the HE, whereas K excretion was almost unchanged on the ME and decreased on the HE. Consequently, the sum of sweat and urinary Na excretion was increased, especially on the HE, whereas K excretion was almost the same on the ME and HE. On the other hand, during the recovery period (from 11:00 to 19:00), urinary K excretion was larger on the ME than on the C. From 9:00 to 19:00 including both the exercise and recovery period, the sum of sweat and urinary K excretion was larger on the ME than on the C. It is concluded that no overall wholebody Na loss is apparent on either the ME or HE, while the overall K loss increases on the ME within 9h after exercise under the present experimental conditions.

Effect of Exercise Intensity on Acute Changes in Sweat and Urinary Sodium, Potassium Excretion during Exercise.