Griefahn B
Eur J Appl Physiol Occup Physiol. 1977 Jun 15;37(1):13-6. doi: 10.1007/BF00421594.
Short acoustical stimuli induce a biphasic reaction in pulse rate. After an initial increase in frequency, pulse rate decreases below the value calculated before stimulation. This decrease is followed by a slow increase towards the baseline value. As described by other authors the maximum occurs at the 4th heart beat after onset of stimuli. It could be pointed out that the occurrence of the maximum is related to the pulse rate measured before the stimuli. The higher this rate, the "later" the maximum occurs if it is expressed in beats after stimulation. A new mode of evaluation which is independent of pulse rate pointed out that the time between stimulus and maximum is constant. It is proposed to use the evaluation described here in order to allow a most exact location of the extreme values. For experiments with very small variability of pulse rate the evaluation used till now will be sufficient, but only if the mean pulse rate and it's standard deviation before stimulation is mentioned.
短声刺激会引起心率的双相反应。在频率最初增加之后，心率会降至刺激前计算出的值以下。这种下降之后是缓慢回升至基线值。正如其他作者所描述的，最大值出现在刺激开始后的第4次心跳时。可以指出，最大值的出现与刺激前测量的心率有关。该心率越高，若以刺激后的心跳数来表示，最大值出现得就“越晚”。一种独立于心率的新评估模式指出，刺激与最大值之间的时间是恒定的。建议使用此处描述的评估方法，以便最精确地定位极值。对于心率变异性非常小的实验，到目前为止所使用的评估方法就足够了，但前提是要提及刺激前的平均心率及其标准差。
