Leiper, J. B., Nicholas, C. W., Ali, A., Williams, C., & Maughan, R. J. (2003). The effect of intermittent high-intensity running on the rate of gastric emptying in man. Medicine and Science in Sports and Exercise, 35(5), Supplement abstract 1181.

The volume of test drink emptying was assessed during exercise. Males (N = 8) walked for two periods of 15 minutes (LOW - low-intensity exercise) and performed two 15-min shuttle runs (LIST - high intensity exercise), the shuttle simulating soccer activity. Ss ingested test drinks (commercial carbohydrate fluid and a placebo) before both trials.

There was no difference between the emptying rates of the two fluids. The high-intensity exercise slowed the emptying rate compared to that of the low-intensity exercise.

Implication. Fluid emptying is increasingly slowed with increases in exercise intensity.

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