| Abstract: | The localization of the principal metabolic processes in the heart of untrained, trained, and overtrained rats in a state of relative rest and in untrained rats exposed to single and repeated physical exertion was investigated histochemically. Processes of glycogenolysis and glycolysis in the myocardium were found to be more active in the subendocardial layers, whereas oxidation of fatty acids and ketone bodies was more active in the subepicardial layers. The reverse relationships were found in the myocardium of trained and overtrained rats. The role of the subepicardial layers of the myocardium in the maintenance of cardiac function in response to a sharp increase in the intensity of its activity is demonstrated.Laboratory of Functional Morphology, All-Union Research Institute of Physical Culture, Moscow. (Presented by Academician of the Academy of Medical Sciences of the USSR A. P. Avtsyn.) Translated from Byulleten' Éksperimental'noi Biologii i Meditsiny, Vol. 86, No. 11, pp. 607–610, November, 1978. |
