Schaffarczyk, M.; Rogers, B.; Reer, R.; Gronwald, Sensors 2022, 22, 6536. 30 August 2022 https://www.mdpi.com/1424-8220/22/17/6536 «The present study compared selected HRV data (with inclusion of DFA a1) obtained by the Polar H10 chest strap device using the Elite HRV application for data recording, storage and export vs. a 12-channel ECG CardioPart 12 Blue (AMEDTEC Medizintechnik …