Reminder: RMSSD and SD1 are identical heart rate variability metrics

Anthony B. Ciccone, Jacob A. Siedlik, Jill M. Wecht, Jake A. Deckert, Nhuquynh D. Nguyen, Joseph P. Weir

Research output: Contribution to journalArticlepeer-review

70 Scopus citations


Assessment of heart rate variability (HRV) is a common approach to examine cardiac autonomic nervous system modulation that has been employed in a variety of settings. Frequently, both the root mean square of successive differences (RMSSD) and SD1, which is a Poincaré plot component, have been used to quantify short-term heart rate variability. It is not typically appreciated, however, that RMSSD and SD1 are identical metrics of HRV. As a reminder to clinicians and researchers who use and study HRV, we show both empirically and mathematically that RMSSD and SD1 are identical metrics. Because the homology between RMSSD and SD1 is not commonly known, the inclusion of both measures has been reported in many recent publications. The inappropriate use of such redundant data may affect the interpretation of HRV studies. Muscle Nerve 56: 674–678, 2017.

Original languageEnglish (US)
Pages (from-to)674-678
Number of pages5
JournalMuscle and Nerve
Issue number4
StatePublished - Oct 1 2017

All Science Journal Classification (ASJC) codes

  • Physiology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience
  • Physiology (medical)


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