[Effect of dietary fats and carbohydrates on protein restoration in the myocardium].

A study was made of the effect of high-fatty and high-carbohydrate diets on the rate of the renewal of individual rat myocardial proteins, particularly on the half-life and the constant of degradation of proteins of sarcoplasm, myosin and actin. Unlike the control diet, the high-carbohydrate diet increased the rate of myosin renewal by 25%, while the fatty diet retarded 20% the rate of the renewal of the main contractile myocardial protein. Similar changes were also found for proteins of sarcoplasma: with the high-carbohydrate diet the rate of the renewal increased 10%, whereas with the high-fatty one it diminished 47%. The rate of actin renewal dropped 11% with the high-carbohydrate diet and 30% with the high-fatty diet. Unbalance in carbohydrate and fatty supply of the body produces appreciable changes in the rate of the renewal of individual proteins of the rat myocardium.