EVALUATION OF MYOCARDIAL AND PERIPHERAL VASCULAR-RESPONSES DURING REACTION-TIME, MENTAL ARITHMETIC, AND COLD PRESSOR TASKS
EVALUATION OF MYOCARDIAL AND PERIPHERAL VASCULAR-RESPONSES DURING REACTION-TIME, MENTAL ARITHMETIC, AND COLD PRESSOR TASKS
复制标题
DOI：
10.1111/j.1469-8986.1987.tb00345.x
复制
发表时间：
1987-11-01
期刊：
影响因子：
3.7
通讯作者：
CROWELL, MD
中科院分区：
文献类型：
--
作者：
ALLEN, MT;OBRIST, PA;CROWELL, MD
本研究的主要目的是探讨反应时、心算和冷加压任务中心输出量和前臂血流量的协变。心输出量指数使用阻抗心动图，而阻抗静脉闭塞体积描记法用于前臂血流指数。在所有三项任务中，心输出量均显著高于静息值，但这些增加的模式不同。在心算和冷加压任务中，心率的大幅增加超过了每搏输出量的减少;反应时间任务的增加是由于每搏输出量增加时心率增加相对较小。对于前臂流量，所有的任务水平均高于休息水平，但只有心算水平在统计学上更高。心输出量与前臂血流变化的相关性在反应时任务中显著，而在心算和冷加压任务中不显著。
The primary purpose of this study was to examine the covariation of cardiac output and forearm blood flow during reaction time, mental arithmetic, and cold pressor tasks. Cardiac output was indexed using impedance cardiography, whereas impedance venous occlusion plethysmography was used to index forearm blood flow. Cardiac output increased signficantly over resting values in all three tasks, but the pattern of these increases differed. Large heart rate increases during mental arithmetic and cold pressor tasks more than offset stroke volume decreases; the increases in the reaction time task were due to relatively smaller heart rate increases with stroke volume augmentation. For forearm flow, all task levels were higher than resting levels, but only mental arithmetic levels were statistically higher. The correlation between cardiac output and forearm blood flow change was significant for the reaction time task, but not for the mental arithmetic or cold pressor tasks.