Evaluating the physiological significance of respiratory sinus arrhythmia: looking beyond ventilation-perfusion efficiency.

@article{BenTal2012EvaluatingTP,
  title={Evaluating the physiological significance of respiratory sinus arrhythmia: looking beyond ventilation-perfusion efficiency.},
  author={Alona Ben-Tal and Sophie S Shamailov and Julian Paton},
  journal={The Journal of physiology},
  year={2012},
  volume={590 8},
  pages={1989-2008}
}
We conducted a theoretical study of the physiological significance of respiratory sinus arrhythmia (RSA), a phenomenon used as an index of cardiac vagal tone and wellbeing, whereby the heart rate (HR) increases during inspiration and decreases during expiration. We first tested the hypothesis that RSA improves gas exchange efficiency but found that although gas exchange efficiency improved with slow and deep breathing and with increased mean heart rate, this was unrelated to RSA. We then… CONTINUE READING
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