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1 Wihuri Research Institute, Helsinki, Finland
The effect of exercise on the salivary Na, K, and protein concentrations and on the serum Na and K concentrations has been studied in young men. The exercise consisted of a march of 2-hr duration. The exercise had no marked effect on the serum Na and K. The salivary Na concentration increased nearly twofold during exercise, and had decreased to its initial value within 2-hr recovery. No noteworthy changes in the salivary K concentration occurred during the experiment. The salivary protein concentration increased during exercise, and this increase was positively correlated with the increase in the salivary Na/K ratio in the same man. These results are ascribed to the increased permeability of the plasma-saliva barrier during the exercise.
Submitted on September 4, 1962
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