Takahashi T, Yamada S, Tanabe K, Nakayama M, Osada N, Itoh H, Murayama M
Dept. of Rehabilitation Medicine, St. Marianna University School of Medicine Hospital, Kanagawa-ken 216, Japan.
Dept. of 2nd Internal Medicine, St. Marianna University School of Medicine, Kanagawa-ken 216, Japan.
J Jpn Phys Ther Assoc. 1998;1(1):13-7. doi: 10.1298/jjpta.1.13.
This study was undertaken to evaluate the postural effect on ventilatory responses during both supine and sitting exercise. Seven healthy men performed two exercise tests utilizing the ramp protocol (20 watts/min) with a cycle ergometer in each position. The results were as follows: The oxygen uptake and the oxygen pulse measured at 180 watts and at anaerobic threshold in the sitting were significantly higher compared with those in the supine position. The average of carbon-dioxide output, minute ventilation and tidal volume at lower exercise intensities showed higher values in the sitting compared with those in the supine position, whereas there were no significant differences for respiratory rate. There was significant difference in the slope of the minute ventilation to carbon-dioxide output plot between sitting and supine position. In conclusion, the higher minute ventilation in the sitting position was mainly performed by higher tidal volume which may counteract the effects of an increase in physiological dead space. The lower slope of the minute ventilation to carbon-dioxide output plot which shows more effective ventilation in the supine position may be due to decreased physiological dead space and higher diffusion capacity.
本研究旨在评估仰卧位和坐位运动期间姿势对通气反应的影响。七名健康男性在每个体位下使用蹬车测力计，按照斜坡方案（20瓦/分钟）进行了两项运动测试。结果如下：与仰卧位相比，坐位时在180瓦及无氧阈值时测得的摄氧量和氧脉搏显著更高。在较低运动强度下，坐位时的二氧化碳排出量、分钟通气量和潮气量的平均值高于仰卧位，而呼吸频率无显著差异。坐位和仰卧位之间分钟通气量与二氧化碳排出量关系图的斜率存在显著差异。总之，坐位时较高的分钟通气量主要是由较高的潮气量实现的，这可能抵消了生理死腔增加的影响。分钟通气量与二氧化碳排出量关系图的斜率较低，表明仰卧位通气更有效，这可能是由于生理死腔减少和弥散能力增强。
