Abstract
Concentration of epinephrine and norepinephrine was measured in human plasma after acute and chronic work. Samples were analyzed by the method of Weil-Malherbe and Bone. Norepinephrine increased markedly with acute muscular work (about 3-fold) and returned to normal within 15-30 minutes after work. Epinephrine response to acute muscular work showed wide variation between individuals, varying from marked rise to no detectable change. Epinephrine values, when elevated, also returned to control levels within 15-30 minutes.

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