Respiratory sinus arrhythmia in humans: how breathing pattern modulates heart rate.

  title={Respiratory sinus arrhythmia in humans: how breathing pattern modulates heart rate.},
  author={Judith Ann Hirsch and Beverly P. Bishop},
  journal={The American journal of physiology},
  volume={241 4},
The relationship of respiratory sinus arrhythmia amplitude (RSA) to tidal volume and breathing frequency was quantified during voluntarily controlled tidal volume and breathing frequency and spontaneous quiet breathing. Seventeen seated subjects breathed via mouthpiece and nose-clip, maintaining constant tidal volumes at each of several breathing frequencies. Inspiratory breath hold was zero frequency. Log RSA was plotted vs. log frequency for each tidal volume. The large stable RSA for… 

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