Heart rate variability: origins, methods, and interpretive caveats.

@article{Berntson1997HeartRV,
  title={Heart rate variability: origins, methods, and interpretive caveats.},
  author={Gary G. Berntson and J. Thomas Bigger and Dwain L Eckberg and Paul Grossman and Peter G. Kaufmann and Marek Malik and H. N. Nagaraja and Stephen W. Porges and J. Philip Saul and Peter H. Stone and Maurits W. van der Molen},
  journal={Psychophysiology},
  year={1997},
  volume={34 6},
  pages={
          623-48
        }
}
Components of heart rate variability have attracted considerable attention in psychology and medicine and have become important dependent measures in psychophysiology and behavioral medicine. Quantification and interpretation of heart rate variability, however, remain complex issues and are fraught with pitfalls. The present report (a) examines the physiological origins and mechanisms of heart rate variability, (b) considers quantitative approaches to measurement, and (c) highlights important… 
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