[Effect of corticotropin and hydrocortisone on the contractility and heat production of skeletal muscles].

The ACTH was shown to increase whereas hydrocortisone entailed no changes of the muscle contraction amplitude, the duration of the muscle work to fatigue in the regimen of solitary rhythmic contractions being, however, shortened in both bases. The heat production for a unit of the muscle work remained the same after ACTH and decreased after hydrocortisone. The corticotropin increases whereas hydrocortisone decreases the efficiency of the energy substances usage by the working muscles.