Wilson B A, Hermiston R T
J Hum Ergol (Tokyo). 1975 Sep;4(1):35-41.
Cardiac outputs were calculated on eight male college students while walking on a treadmill at controlled heart rate levels. The heart rate levels were maintained through the use of a heart rate controller (Quinton Model AI-607), standard deviations for heart rate in beats/min ranged from +/-2.1 at the heart rate level 110 to +/-3.2 at 170. Test-retest correlations of the cardiac output values at the various heart rate levels were: at heart rate 110, 0.66 after 7 min and 0.85 at 30 min; at heart rate 150, 0.92 after 7 min and 0.68 at 30 min; at heart rate 130, 0.97 after 7 min, and at heart rate 170, 0.85 after 7 min. The calculated cardiac output values when plotted against oxygen uptake compare favorably with published reports. The data collected demonstrate that the CO2-rebreathing method used in the present investigation provides a reliable bloodless technique for determining multiple cardiac output during prolonged work of varied intensities.
在八名男性大学生在跑步机上以受控心率水平行走时计算心输出量。通过使用心率控制器（昆顿AI - 607型）维持心率水平，心率的标准差以每分钟心跳数计，在心率水平110时为±2.1，在170时为±3.2。不同心率水平下心输出量值的重测相关性为：心率110时，7分钟后为0.66，30分钟后为0.85；心率150时，7分钟后为0.92，30分钟后为0.68；心率130时，7分钟后为0.97；心率170时，7分钟后为0.85。将计算得到的心输出量值与摄氧量绘制在一起时，与已发表的报告相比情况良好。本研究中收集的数据表明，本研究中使用的二氧化碳重呼吸法提供了一种可靠的无血技术，用于在不同强度的长时间工作期间测定多个心输出量。
