Takemiya T, Kinugasa T, Miyashita M, Maeda J, Komiya H
Nihon Seirigaku Zasshi. 1985;47(2):65-76.
Time-dependent measurements of differential digital plethysmogram during exercise were made on five male subjects. The results obtained were as follows; Differential digital plethysmogram (delta DPG) was obtained by using biophysical amplifier with the time constant of 0.03 seconds which minimized the fluctuation of the baseline in digital plethysmogram (DPG). A linear relationship was shown in P wave amplitude of both delta DPG and DPG. The decrease in delta DPG-P waves was observed in visual concentrations, mental learning and arithmetic, initial inspiratory phase with tachycardia, maximal inspiratory and/or expiratory breath holding, and head-up tilt at 60 degrees or over. The increase in delta DPG-P waves was obtained at the expiratory phase with bradycardia and in the effect of alcohol intake. During 15 minutes of bicycle ergometer exercise at 750 kpm/min, the P wave amplitude in delta DPG decreased to 77% of the control in the first one minute of exercise, and then gradually increased to 218% at the final stage of exercise (p less than 0.01). Heart rate measured simultaneously increased, as compared from the beginning of exercise. P wave amplitude and heart rate after exercise decreased progressively to the control level. It is suggested that the initial decrease in P wave amplitude of delta DPG couples with the dominant activity of the sympathetic vasoconstrictor, and the final increase in P waves is due to the compound factors of the increased cardiac output and arteriolar vasodilation.
对五名男性受试者在运动期间进行了数字微分体积描记图的时间依赖性测量。获得的结果如下：使用时间常数为0.03秒的生物物理放大器获得数字微分体积描记图（δDPG），该放大器可使数字体积描记图（DPG）中的基线波动最小化。δDPG和DPG的P波振幅均呈现线性关系。在视觉专注、心理学习和算术、伴有心动过速的初始吸气阶段、最大吸气和/或呼气屏气以及60度或以上的头高位倾斜时，观察到δDPG - P波减小。在伴有心动过缓的呼气阶段以及酒精摄入的影响下，δDPG - P波增加。在以750千帕米/分钟的速度进行15分钟的自行车测力计运动期间，运动的第一分钟内，δDPG中的P波振幅降至对照值的77%，然后在运动末期逐渐增加至218%（p<0.01）。与运动开始时相比，同时测量的心率增加。运动后的P波振幅和心率逐渐降至对照水平。提示δDPG的P波振幅最初下降与交感缩血管神经的主导活动有关，而P波最终增加是由于心输出量增加和小动脉血管舒张的复合因素所致。
