Difference in human cardiovascular response between upright and supine recovery from upright cycle exercise
Difference in human cardiovascular response between upright and supine recovery from upright cycle exercise
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直立循环运动中直立和仰卧恢复时人类心血管反应的差异
DOI：
10.1007/s004210050036
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发表时间：
2000
影响因子：
3
通讯作者：
Y. Miyamoto
中科院分区：
文献类型：
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作者：
Tatsuhisa Takahashi;A. Okada;T. Saitoh;J. Hayano;Y. Miyamoto
摘要：在 80% 峰值摄氧量下进行 5 分钟的直立循环运动后，检查 7 名健康男性受试者在直立或仰卧位恢复 10 分钟期间的心血管反应。在恢复的早期阶段，直立位和仰卧位的心率 (fc) 最初快速下降，随后下降速度慢得多。仰卧位恢复第10分钟的平均fc显着低于直立位（P < 0.05），但均显着高于相应的运动前水平（均P < 0.05）。因此，两个位置的 R-R 间隔变异性（通过频谱分析）的高频 (HF) 分量的幅度随着平均 R-R 间隔的减小而减小，该关系用回归线表示 – 平均 R-R 间隔 = 0.006 × HF 幅度 + 0.570 (r = 0.905，n = 28， P < 0.001）。这些结果表明，在两个位置最初快速减少之后，fc 的缓慢减少部分归因于心脏副交感神经系统活动恢复的延迟。运动后直立每搏输出量（SV，通过阻抗心动图）逐渐下降至略低于运动前的水平，而运动后仰卧每搏输出量显着增加至与运动前休息时相似的水平。直立位和仰卧位的心输出量（Q˙c）和总外周血管阻力（TPR）逐渐恢复到相应位置的运动前水平。恢复第10 min时，仰卧位的平均SV和Q˙c均显着大于直立位（均P < 0.005），而仰卧位的平均TPR显着低于直立位（P < 0.05）。相比之下，运动后立即，仰卧位和直立位的平均血压均显着下降，并且恢复后第 10 分钟的水平相似。因此我们得出结论，在不同体位的休息和恢复期间，通过与fc、SV、Q˙c和TPR相关的各种代偿机制，动脉血压保持相对恒定。
Abstract Cardiovascular responses were examined in seven healthy male subjects during 10 min of recovery in the upright or supine position following 5 min of upright cycle exercise at 80% peak oxygen uptake. An initial rapid decrease in heart rate (fc) during the early phase of recovery followed by much slower decrease was observed for both the upright and supine positions. The average fc at the 10th min of recovery was significantly lower (P < 0.05) in the supine position than in the upright position, while they were both significantly greater than the corresponding pre-exercise levels (each P < 0.05). Accordingly, the amplitude of the high frequency (HF) component of R-R interval variability (by spectrum analysis) in both positions was reduced with a decrease in mean R-R interval, the relationship being expressed by a regression line – mean R-R interval = 0.006 × HF amplitude + 0.570 (r = 0.905, n = 28, P < 0.001). These results would suggest that the slower reduction in fc following the initial rapid reduction in both positions is partly attributable to a retardation in the restoration of the activity of the cardiac parasympathetic nervous system. Post-exercise upright stroke volume (SV, by impedance cardiography) decreased gradually to just below the pre-exercise level, whereas post-exercise supine SV increased markedly to a level similar to that at rest before exercise. The resultant cardiac output (Q˙c) and the total peripheral vascular resistance (TPR) in the upright and supine positions returned gradually to their respective pre-exercise levels in the corresponding positions. At the 10th min of recovery, both average SV and Q˙c were significantly greater (each P < 0.005) in the supine than in the upright position, while average TPR was significantly lower (P < 0.05) in the supine than in the upright position. In contrast, immediately after exercise, mean blood pressure dropped markedly in both the supine and upright positions, and their levels at the 10th min of recovery were similar. Therefore we concluded that arterial blood pressure is maintained relatively constant through various compensatory mechanisms associated with fc, SV, Q˙c, and TPR during rest and recovery in different body positions.
影响因子：
--
作者：
POMERANZ, B;MACAULAY, RJB;BENSON, H
通讯作者：
BENSON, H