EXERCISE IN THE SYMPATHECTOMIZED CAT

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Abstract
Completely sympathectomized cats are able to run much less rapidly and for much shorter periods without becoming fatigued than before the operation. Apparent regrowth of some sympathetic fibers (probably to the adrenal medulla) restores the running ability to some extent. Injected adrenaline may improve the running ability of a sympathectomized cat. The cardiac acceleration after exercise is about 30% less in sympathectomized than in normal cats. A cardiac acceleration greater than that caused by removal of vagal inhibition occurs in sympathectomized cats after exercise or emotion; this is attributed to accelerators in the vagus trunk. Possible reasons for the difference in behavior of the sympathectomized cat and dog are discussed.