Cardiovascular responses to lower body negative pressure in endurance and static exercise-trained men.
Cardiovascular responses to lower body negative pressure in endurance and static exercise-trained men.
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接受耐力和静态运动训练的男性对下半身负压的心血管反应。
DOI：
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发表时间：
1986
影响因子：
4.1
通讯作者：
P. Raven
中科院分区：
文献类型：
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作者：
Michael L. Smith;P. Raven
在8名久坐对照（UT）、8名耐力训练（ET）和8名负重训练（WT）的人中检查了对下体负压（LBNP）（至-50 mmHg）的心血管反应。结果用于比较和对比三组受试者的血压控制系统。反应的主要差异包括更有效地维持血压，因为WT受试者在LBNP期间的每搏输出量和心脏指数更大（P <0.05）。外周血管阻力在整个LBN P三组之间没有差异（P> 0.05）。因此，WT受试者的血压维持改善归因于心脏效应。ET受试者在维持血压方面不如UT或WT受试者有效。这一发现显然是由于压力感受性反射敏感性减弱，如通过从0至-50 mmHg的LBNP观察到的反应计算的显著（P小于0.05）较低的Δ心率/Δ全身血压比所证明的，ET组为0.99，UT组和WT组分别为1.51和1.38。
The cardiovascular responses to lower body negative pressure (LBNP) (to -50 torr) were examined in 8 sedentary control (UT), 8 endurance-trained (ET), and 8 weight-trained (WT) human subjects. The results were used to compare and contrast the blood pressure control system of the three subject groups. The primary differences in response included a more effective maintenance of blood pressure, by reason of greater stroke volume and cardiac indices of the WT subjects during LBNP (P less than 0.05). Peripheral vascular resistances were not different (P greater than 0.05) throughout LBN P between the three groups. Therefore, the improved blood pressure maintenance of the WT subjects was attributed to a cardiac effect. The ET subjects were less effective in maintaining blood pressure than UT or WT subjects. This finding was apparently due to an attenuated baroreflex sensitivity, as evidenced by a significantly (P less than 0.05) lower delta heart rate/delta systemic blood pressure ratio, 0.99 for ET vs 1.51 and 1.38 or the UT and WT groups respectively, calculated from the responses observed from 0 to -50 torr of LBNP.