[Effect of physical activity on blood lipids and adrenal function during emotional stress]

The experiments on physically trained and untrained dogs have shown that violent physical exertion (racing up to complete exhaustion) in the presence of emotional stress enhances stress-induced hyperlipemia. The untrained animals developed especially abrupt changes in lipid metabolism. In the trained animals the repeated cycles (stress without complete exhaustion) made the adrenal function and lipid metabolism return to normal and stabilize irrespective of exposures. A decrease in the adrenal function in the untrained animals with hyperlipemia is considered to be the atherogenic factor. The role of physical activity in atherosclerosis control is discussed.