HRV - CV
percentage
Coefficient of variation for HRV: the consistency of your HRV readings across days. Lower CV indicates a more stable HRV baseline and a consistent recovery capacity.
Typical optimal range 0 - 8
Population median 5
Key factors
- Regularity of sleep schedule
- Chronic stress levels
- Consistency of exercise habits
What affects this metric
- Inconsistent sleep timing is the largest driver of unstable HRV.
- Alternating rest and hard training days widens the swing.
- Illness raises variability before it changes the average.
References
Peer-reviewed sources supporting the key factors, contributing factors, and typical optimal range shown above.
- Shaffer F, Ginsberg JP. An overview of heart rate variability metrics and norms. Frontiers in Public Health. 2017;5:258. doi.org/10.3389/fpubh.2017.00258
- Plews DJ, Laursen PB, Stanley J, Kilding AE, Buchheit M. Training adaptation and heart rate variability in elite endurance athletes: opening the door to effective monitoring. Sports Medicine. 2013;43(9):773–781. doi.org/10.1007/s40279-013-0071-8
- Wittmann M, Dinich J, Merrow M, Roenneberg T. Social jetlag: misalignment of biological and social time. Chronobiology International. 2006;23(1–2):497–509. doi.org/10.1080/07420520500545979
- Radin JM, Wineinger NE, Topol EJ, Steinhubl SR. Harnessing wearable device data to improve state-level real-time surveillance of influenza-like illness in the USA. The Lancet Digital Health. 2020;2(2):e85–e93. doi.org/10.1016/S2589-7500(19)30222-5
This guide is general information, not medical advice. Talk to your clinician about your own results.