For a sleep activity, the HRV (%) metric shown on the Hexoskin App is the same as the metric shown as HRVHFnormAvg (%) on the Hexoskin Dashboard. HRVHFnormAVG (%) is calculated automatically in our servers once the sleep activity is completed. You may view the calculation method via on our API metric page: https://api.hexoskin.com/docs/resource/hrvhfnorm/.
For a rest activity, the HRV measure will be given as RMSSD metric, but will be displayed as HRV (ms) on the Hexoskin App.
Keywords: heart rate variability, ECG, EKG, algorithm, biofeedback, cardiac data