Do you know your HRV reference value ? Heart Rate Variability measures the specific changes in time between successive heartbeats and is a great measure of your autonomic nervous system. The daily values are highly personal and variations measured against your reference value is used to assess your wellbeing states. If you want to know more about this metrics you can learn more on our blog. #circularing #bemore #smartring #health #circularblog #heartratevariability #heartratemonitor #frenchtech