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Reminder: RMSSD and SD1 are identical heart rate variability metrics
Journal article   Peer reviewed

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 and Joseph P Weir
Muscle & nerve, Vol.56(4), pp.674-678
10/2017
DOI: https://doi.org/10.1002/mus.25573
PMID: 28073153
Web of Science ID: WOS:000411372400010

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127 Times Cited - Web of Science

Abstract

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.

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