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老年人的心功能对运动的适应能力减弱:运动时,心率加快、心输出量加大的反应低于青年人;血压升高的反应高于青年人。坚持体育锻炼能使运动负荷量增加,射血分数、搏出指数、心指数等心功指标显著增大。其机制可能与老化心肌的钙泵活性下降使心肌舒缩功能减退,去甲肾上腺素和交感神经活动水平增高使缩血管反应增强,以及体育锻炼能使此两项老年性改变逆转有关。
Elderly people’s ability to adapt to exercise weakened heart: exercise, heart rate, cardiac output increased response was lower than young people; higher blood pressure response than young people. Insist on physical exercise can increase exercise load, ejection fraction, stroke index, cardiac index and other cardiac indicators increased significantly. The mechanism may be related to the decrease of calcium pump activity in aged myocardium, which leads to the decrease of myocardial systolic and diastolic function, the increase of norepinephrine and sympathetic nerve activity, the enhancement of vasoconstrictor reaction and the reversal of physical exercise.