Effect of aging on peripheral circulatory responses to regional exercise.

研究了年龄对静态和动态握力运动外周反应的影响。多普勒超声法测定运动时肱动脉血流量。测量血压（Finapres）和心率。所得结果总结如下：1。中年女性（42.2岁）在60秒静态握力运动中血压反应与运动强度呈线性相关，且高于年轻女性（22.2岁）。中年妇女的血压从较低的强度上升得更快。在动态握力运动中，肱动脉血流量随着运动强度的增加而增加，并在30%MVC左右趋于稳定，这主要取决于通过前臂的肌肉血流量。对青年（N=10）、中年（N=5）和老年（N=5）女性进行了最大运动诱导肱动脉血流量的研究。在动态握力训练中获得的最大值之间没有显著差异。然而，随着年龄的增长，运动时的血压升高，老年女性的血管导度计算值明显降低，而中年女性的血管导度与年轻女性相比没有明显降低。综上所述，老年妇女运动时的最大血流量将通过增加血压来维持在与中青年妇女相似的水平。然而，老年妇女的血管导度却降低了。

Effect of aging on peripheral responses to static and dynamic handgrip exercise was determined. Dop pler ultra-sound method was used to determine brachial arterial blood flow during exercise. Blood pressure (Finapres) and heart rate were measured.The results obtained were summarized as follows ;1. Blood pressure response to 60-s static handgrip exercise in middle-aged women (42.2 yrs) increased linearly related to exericise intensity and was elevated higher that that in young women (22.2). The blood pressure increased more steeply from lower intensity in middle-aged women.2. Brachial arterial blood flow increased with exercise intensity during dynamic handgrip exercise and leveled off at around 30%MVC, which will mainly depend on the muscled blood flow through the fore arm.3. Maximal exercise-induced blood flow through brachial artery was studied on young (N=10), middle-aged (N=5) and old-aged (N=5) women. There was no significant difference among those maximal values obtraied during dynamic handgrip exercise.However, the blood pressure during exercise increased with age and the calculated vascular conductance was significantly lower in old-aged women, Though no significant reduction was found in middle aged women compared with that of young women.4. In comclusion, the maximal blood flow during exercise recruiting small muscle mass in old women will be maintained at the similar level as middle- and young women by increasing blood pressure. How ever, the vascular conductance was decreased in older women.