Important influence of respiration on human R-R interval power spectra is largely ignored.

@article{Brown1993ImportantIO,
  title={Important influence of respiration on human R-R interval power spectra is largely ignored.},
  author={Troy E. Brown and Larry A. Beightol and J Koh and Dwain L Eckberg},
  journal={Journal of applied physiology},
  year={1993},
  volume={75 5},
  pages={
          2310-7
        }
}
Frequency-domain analyses of R-R intervals are used widely to estimate levels of autonomic neural traffic to the human heart. Because respiration modulates autonomic activity, we determined for nine healthy subjects the influence of breathing frequency and tidal volume on R-R interval power spectra (fast-Fourier transform method). We also surveyed published literature to determine current practices in this burgeoning field of scientific inquiry. Supine subjects breathed at rates of 6, 7.5, 10… 

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