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在年轻人和老年人中,对暴露于环境热量的心脏反应
Josh Foster1,2,3, Zachary J McKenna1,2, Satyam Sarma1,2
1Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas, United States.
Journal of applied physiology (Bethesda, Md. : 1985)
|July 28, 2025
概括
老年人在极端炎热期间会经历心血管应变,更多地依赖于缩功能增强. 这种反应因热强度而异,影响血压维持.
科学领域:
- 心血管生理学心血管生理学
- 环境健康 环境健康
- 老年学是一门学科.
背景情况:
- 老年人在极端高温暴露期间面临心血管事件的风险增加.
- 关于老年人对环境热应激的特定心脏反应的数据有限.
研究的目的:
- 在极端高温暴露期间,在年轻人和老年人中描述左心室心脏功能.
- 为了比较心脏对热干和热湿环境条件的反应.
主要方法:
- 心声扫描用于评估20名年轻 (18-39岁) 和20名老年 (>65岁) 成人的左心室功能.
- 参与者经历了3小时的暴露在热干 (47°C,15%RH) 或热湿 (41°C,40%RH) 条件下,并进行轻微的体力活动.
- 测量了心脏输出量,中风体积,透静功能和心缩速度.
主要成果:
- 这两个年龄组在热应激期间同样增加了心脏输出量和扩大了透静功能.
- 年长的成年人在干燥的炎热中表现出额头环状缩速度 (S) 的更大增加,这表明对缩机制的依赖程度更高.
- 静脉压在年轻人中保持不变,但在老年人中降低,特别是在干燥热的条件下.
结论:
- 年长的成年人表现出更大的心功能增加,以保持在极端高温期间的心脏输出,有效性取决于热的严重性.
- 尽管有补偿性缩调整,但与年轻人相比,老年人在极端的热应激下维持血压的能力较低.
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