Respiratory sinus arrhythmia, cardiac vagal control, and daily activity.

@article{Grossman2004RespiratorySA,
  title={Respiratory sinus arrhythmia, cardiac vagal control, and daily activity.},
  author={Paul Grossman and Frank H. Wilhelm and Monika Spoerle},
  journal={American journal of physiology. Heart and circulatory physiology},
  year={2004},
  volume={287 2},
  pages={
          H728-34
        }
}
Ambulatory respiratory sinus arrhythmia (RSA) or high-frequency heart rate (HR) variability is frequently employed as an index of cardiac parasympathetic control and related to risk or severity of cardiovascular disease. However, laboratory studies indicate variations in physical activity and respiratory parameters of rate and tidal volume may confound estimation of vagal activity. Because little is known about these relations outside the laboratory, we examined ambulatory relations among RSA… 

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