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Reference 4: Comparison of three mobile devices for measuring R-R intervals and heart rate variability
JMIR Form Res 2022;6(9):e34280
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Polar H10 has previously been found to be valid when compared with ECG, with a correlation of r=0.997 [18].
Polar OH1 was attached to an arm band and strapped securely to the nondominant forearm, according to the manufacturer’s instructions. HR data were recorded at 1-second intervals using 6 light-emitting diode sensors and live transmitted via Bluetooth to a smartphone with the Polar Beat app (Polar Electro Oy).
JMIR Mhealth Uhealth 2021;9(3):e25313
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