THE CAPACITY FOR VIGOROUS MUSCULAR ACTIVITY OF NORMAL RATS AND OF RATS AFTER REMOVAL OF THE ADRENAL MEDULLA

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Abstract
Normal rats and rats after removal of the adrenal medulla were compared in respect to the times required to swim to exhaustion when handicapped by weighting. The performances of rats without adrenal medullas were as good under these exptl. conditions as those of normal rats. Under these exptl. conditions the absence of the adrenal medulla did not decrease the capacity of the rat to respond in a normal manner to this type of "emergency" situation. It was not established by these expts. that there is a reflex discharge of epinephrine from the adrenal medulla during vigorous swimming. There is no satisfactory test for the presence of epinephrine in the blood of the rat.

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