Respiratory sinus arrhythmia: noninvasive measure of parasympathetic cardiac control.

@article{Katona1975RespiratorySA,
  title={Respiratory sinus arrhythmia: noninvasive measure of parasympathetic cardiac control.},
  author={Peter G Katona and Felix Jih},
  journal={Journal of applied physiology},
  year={1975},
  volume={39 5},
  pages={801-5}
}
The degree of parasympathetic heart rate control, PC, was defined as the decrease in average heart period (RR interval) caused by the elimination of parasympathetically mediated influences on the heart while keeping sympathetic activity unchanged. By reviewing published results on the interaction of sympathetic and parasympathetic heart rate control, the prediction was made that PC should be directly proportional to VHP, the peak-to-peak variations in heart period caused by spontaneous… CONTINUE READING
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