等长肌肉收缩在体育锻炼和训练中常常被采用。据认为,由于这种试验可导致老年人不适血压反应,故对老年人有潜在危险。除了代谢速度加快之外,当肌肉收缩力超过最大自主收缩的25～30%时,血压会大幅度上升,从而加重左室负荷,导致心肌代谢需求的增加。正常心血管对静态肌肉收缩的反 Isometric muscle contraction is often used in physical exercise and training. It is believed that this test is potentially dangerous to the elderly because it can cause an elderly person to suffer from a blood pressure reaction. In addition to the accelerated metabolism, when muscle contractility exceeds the maximum voluntary contraction of 25 to 30%, the blood pressure will rise dramatically, thus increasing the left ventricular load, resulting in increased myocardial metabolic demand. Normal cardiovascular contractions against static muscle contractions