Accuracy of Heart Rate Measurement by the Fitbit Charge 2 During Wheelchair Activities in People With Spinal Cord Injury: Instrument Validation Study

Dirk Hoevenaars   ^{1, 2} , MSc ;   Iris E Yocarini   ³ , PhD ;   Stylianos Paraschiakos   ^{3, 4} , MSc ;   Jasmijn F M Holla   ^{2, 5, 6} , PhD ;   Sonja de Groot   ^{1, 2, 6} , PhD ;   Wessel Kraaij   ³ , PhD ;   Thomas W J Janssen   ^{1, 2, 6} , PhD

¹ Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands

² Amsterdam Rehabilitation Research Center, Reade, Amsterdam, The Netherlands

³ Leiden Institute of Advanced Computer Science, Leiden University, Leiden, The Netherlands

⁴ Molecular Epidemiology, Department of Biomedical Data Science, Leiden University Medical Center, Leiden, The Netherlands

⁵ Faculty of Health, Sports and Social Work, Inholland University of Applied Sciences, Haarlem, The Netherlands

⁶ Center for Adapted Sports, Amsterdam Institute of Sport Science, Amsterdam, The Netherlands