生理变化休息时,心率与年龄关系不大,但窦房结的固有节律性随年龄而减退。例如心房快速起搏后,窦房结恢复时间延长。当强度工作时,不管对病人是否适宜,心脏所能达到的最大心率随增龄而减少。心排出量虽有增加,但比年轻人为少。活动后,随增龄心率需要更长的时间恢复到正常。年龄超过65岁者,在活动时血压不能如65岁以下者持续升高。动脉压常处于正常平均血压140/90mmHg之限值内或更低。但在极度活动时,动脉收缩压升高幅度较大,并需要比年轻人更长的时间才能复恢到活动前水平,在休息状态下,心排出量随 Physiological changes at rest, the heart rate and age has little to do, but the inherent rhythmic sinus node decline with age. For example, rapid atrial pacing, sinus node recovery time extended. When working at strength, the maximum heart rate that the heart can reach decreases with age, regardless of the patient’s fit. Although the amount of cardiac output increased, but less than younger people. After activity, it takes longer to recover to normal with increasing age. People over the age of 65, during the event of blood pressure can not be as 65 years of age continued to rise. Arterial pressure is often within the normal mean blood pressure 140 / 90mmHg limit or less. However, in extreme activities, arterial systolic blood pressure increased by a large margin, and need more time than young people to regain the pre-activity level, resting state, cardiac output with