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The Effects on Respiratory Metabolism Produced by Equal Amounts of Caffeine in the Form of Coffee, Tea and the Pure Alkaloid

One Figure

T. T. Fishburne Laboratory of Physiology, Emory University, Georgia

A comparative study has been made of the gaseous exchange of two well trained subjects following the ingestion of 200 mg. caffeine alkaloid and of coffee and tea infusions containing this amount of caffeine.

The action of caffeine on oxygen consumption, carbon dioxide elimination, the respiratory quotient and respiratory ventilation was the same as that observed in previous experiments of this kind. Coffee and tea had the same effect as the alkaloid.

Comparison of these results with those obtained with decaffeinated coffee and decaffeinated coffee to which caffeine was added shows that the effect of coffee and tea was due solely to their caffeine content.

It may be concluded from these experiments that the rate of absorption and the action of caffeine in coffee and tea is the same as that of the pure alkaloid in solution.