在健康的老年男性中,在动态运动期间增加了前臂血管收缩.
J A Taylor1, G A Hand, D G Johnson
1Department of Exercise and Sport Sciences, University of Arizona, Tucson.
Circulation
|December 1, 1992
概括
年长的男性在动态炼期间会在不运动的四肢中经历增加的血管收缩,这可能是由于交感神经系统活动增加. 这一发现表明,身体活动期间血管控制的年龄相关变化.
科学领域:
- 心血管生理学心血管生理学
- 运动生理学 运动生理学
- 衰老研究研究 衰老研究
背景情况:
- 衰老对身体对运动的生理反应的影响是研究的一个关键领域.
- 了解动态炼期间非活动四肢血管收缩如何随着年龄的增长而变化,对于评估心血管健康至关重要.
研究的目的:
- 为了调查在大型肌肉动态运动期间非活跃四肢的血管收缩反应是否在老年人中被放大.
- 为了比较年轻和年长的健康男性对运动的生理反应.
主要方法:
- 该研究涉及16名年轻 (26岁) 和12名年长 (65岁) 的健康男性,身体活动水平相似.
- 参与者在各种次最大强度下进行了仰卧腿骑自行车,而研究人员测量了血压,心率,前臂血流,血管阻力以及血中诺上腺素和上腺素度.
主要成果:
- 老年男性的峰值工作量和氧气摄入量较低,但与年轻男性相比,运动对血压反应类似.
- 在老年男性中,前臂血管阻力更高,在运动期间,前阴茎静脉诺尔上度的增加更大.
- 前臂皮肤的血流反应在两组之间是相似的,但对非运动的同情刺激的血管收缩器反应在老年男性中变得模糊.
结论:
- 健康的老年男性在动态炼期间表现出增强的前臂血管收缩,这可能是由于对骨肌肉抵抗血管的同情性外流增加而引起的.
- 这些发现表明交感血管收缩器调整的年龄相关变化,而不是对压力的一般过度反应.
- 研究的健康老年男性中,动脉血压调节似乎是正常的.
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