Abstract
Objective: To assess the validity of Polar Verity Sense, an arm-worn heart rate (HR) monitor, for measuring HR in individuals with obesity during the submaximal ergometer cycle Ekblom-Bak test.
Subjects/Patients: Adults in an inpatient rehabilitation programme for individuals with obesity.
Methods: Participants completed the Ekblom-Bak test wearing the Polar H10 chest strap and 2 Verity Sense devices on the forearm and upper arm. Statistical analyses included intraclass correlation coefficient (ICC), Lin’s concordance correlation coefficient (CCC), Bland–Altman analyses with 95% limits of agreement (LoA), and mean absolute percentage error (MAPE). Feasibility was assessed with a post-test questionnaire.
Results: 49 participants were included in the analyses of estimated maximal oxygen consumption (VO2max), while 48 were included in analyses of HR data. ICC and CCC values ranged from 0.998–0.999 between the H10 chest strap and Verity Sense measures. Small differences were observed in Bland–Altman plots. MAPE ranged from 0.46% to 0.51%. Feasibility responses from the questionnaire showed that participants preferred the Verity Sense to the H10.
Conclusion: Polar Verity Sense accurately measures HR and estimates VO2max in adults with obesity during the Ekblom-Bak test. Individuals with obesity may freely opt for either device without sacrificing accuracy during steady-state activities at low and moderate intensities. This choice may eliminate a barrier in assessing their cardiorespiratory fitness.