Validation of Fitbit Charge 2 Sleep and Heart Rate Estimates Against Polysomnographic Measures in Shift Workers: Naturalistic Study

Benjamin Stucky   ^{1, 2 *} , PhD ;   Ian Clark   ^{1 *} , PhD ;   Yasmine Azza   ^{3, 4, 5} , PhD ;   Walter Karlen   ^{2, 6} , PhD ;   Peter Achermann   ^{2, 7} , PhD ;   Birgit Kleim   ^{2, 3, 4} , PhD ;   Hans-Peter Landolt   ^{1, 2} , PhD

¹ Institute of Pharmacology and Toxicology, University of Zurich, Zurich, Switzerland

² Sleep & Health Zurich, University Center of Competence, University of Zurich, Switzerland

³ Department of Experimental Psychopathology and Psychotherapy, University of Zurich, Zurich, Switzerland

⁴ Department of Psychiatry, Psychotherapy and Psychosomatics, University Hospital for Psychiatry, University of Zurich, Zurich, Switzerland

⁵ Department of Psychiatry and Psychotherapy, Translational Psychiatry Unit, University of Lubeck, Lubeck, Germany

⁶ Mobile Health Systems Lab, Department of Health Sciences and Technology, ETH Zurich, Zurich, Switzerland

⁷ The Key Institute for Brain-Mind Research, Department of Psychiatry, Psychotherapy and Psychosomatics, University Hospital for Psychiatry, University of Zurich, Zurich, Switzerland

*these authors contributed equally