THE EFFECT OF MUSCULAR WORK AND COMPETITION ON GASTRIC ACIDITY

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Abstract
Observations on one normal young woman and confirmed on 3 others showed that gentle exercise before or after an Ewald test meal augments gastric acidity, as determined by the number of cc. of N/10 NaOH necessary for the neutralization of 100 cc. of gastric juice. Protracted exercise, such as a 28-mile bicycle ride, is not necessarily depressing, but exhaustive muscular exertion, whether it precedes or follows a test meal, is associated with a diminution of the acidity of the gastric juice to a level below resting normal. A battery of violent exercises carried on at high speed for 5 min. produced an average decrease of 50.92% in HCl and 33.14% in total acidity. Competitive sport participation accompanied by emotional excitement was also associated with a diminution in gastric acidity.

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