Swiss Federal Institute of Sport Magglingen SFISM, Hauptstrasse 247, 2532, Magglingen Rahel Gilgen‑Ammann Theresa Schweizer Thomas Wys RR interval signal quality of a heart rate monitor and an ECG Holter at rest and during exercise: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwiKos3IhuH4AhWF_bsIHfGlD2kQFnoECAIQAQ&url=https%3A%2F%2Fwww.ppdb.ehsm.ch%2Finf2%2Frm%2Ff.php%3Ff%3D20200416162130_5e9869eab833b.pdf%26n%3DGilgenAmmann_RRIntervalSignalQuality_2019.pdf&usg=AOvVaw23MOAobT8so8HFGAdgdcPo Polar H10 has an inaccuracy of 0.4 % against peak detection methods. Choose the most accurate device for sports …