Abstract
The capillary ultrastructure of the myocardium of untrained male Wistar albino rats was studied during the period of fatigue after nonrepetitive physical exertion (swimming). Besides capillaries with the ordinary structure, many of them showed increased micropinocytosis and the appearance of numerous cytoplasmic projections on the luminal surface of the endothelium indicating increased endothelial permeability. In some cases considerable pericapillary edema was seen. The number of polysomes in the endothelium was increased. The results point to the possible morphological mechanisms of pathological changes in the heart.
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