Moderate intensity, but not high intensity, treadmill exercise training significantly increased peak power output normalized to maximal force in permeablized myocytes of 30-month-old rats.
Does moderate or high intensity treadmill exercise training improve myocardial power output in aged rats?
Moderate intensity, but not high intensity, treadmill exercise training for 11 weeks improves myocardial power output in aged rats.
Aging is characterized by a progressive decline in cardiac function, but endurance exercise training has been shown to retard a number of deleterious effects of aging. However, underlying mechanisms by which exercise training improves age-related decrements in myocardial contractile function are not well understood. The purpose of this study was to determine the effects of exercise training on power output properties in permeablized (skinned) myocytes of old rats. Thirty-month-old rats were divided into sedentary control (C) and groups undergoing 11 weeks of treadmill exercise training at moderate intensity (MI) and at high intensity (HI). Peak power output normalized to maximal force was significantly increased in MI but not in HI compared to C with significant increases in atrial myosin light chain 1 in ventricle. These results suggest that MI exercise training is beneficial as a significant increase was seen in the ability of the myocardium to do work, but this effect was not seen with HI training.
Chung et al. (Wed,) conducted a other in Aging. Treadmill exercise training vs. Sedentary control was evaluated on Peak power output normalized to maximal force in permeablized myocytes. Moderate intensity, but not high intensity, treadmill exercise training significantly increased peak power output normalized to maximal force in permeablized myocytes of 30-month-old rats.
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