Classic electrocardiogram-based and mobile technology derived approaches to heart rate variability are not equivalent.

Unlabelled: We compared classic ECG-derived versus a mobile approach to heart rate variability (HRV) measurement.

Methods & Results: 29 young adult healthy volunteers underwent a simultaneous recording of heart rate using an ECG and a chest heart rate monitor at supine rest, during mental stress and active standing. Mean RR interval, Standard Deviation of Normal-to-Normal (SDNN) of RR intervals, and Root Mean Square of the Successive Differences (RMSSD) between RR intervals were computed in 168 pairs of 5-minute epochs by in-house software on a PC (only sinus beats) and by mobile application "ELITEHRV" on a smartphone (no beat type identification).