Heart Rate Measurement Accuracy of Fitbit Charge 4 and Samsung Galaxy Watch Active2: Device Evaluation Study - Nissen, Michael; Slim, Syrine; Jäger, Katharina; Flaucher, Madeleine; Huebner, Hanna; Danzberger, Nina; Fasching, Peter A.; Beckmann, Matthias W.; Gradl, Stefan; Eskofier, Bjoern M. (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2022)