Ritvo, Paul G.Williams, Spencer Harrison2021-11-152021-11-152021-082021-11-15http://hdl.handle.net/10315/38765Previous studies emphasize concurrent validity of wearable devices during physical activity. We investigate device agreement between Fitbit Charge 2 (FBC2) Heart Rate (HR) and electrocardiography (ECG) under sedentary conditions. In a sample of 32 post-secondary students, agreement was observed during rest, negative affect images, deceptive pattern solving task, and a listening task. ECG HR and FBC2 HR was sampled continuously and transformed into 1120 paired 1-min epochs throughout a 35-minute protocol. Bland-Altman were adopted to evaluate agreement. FBC2 HR underestimated ECG HR as indicated by a mean error bias = -1.1 bpm (95% limits of agreement, -5.62 to 3.42), mean absolute percentage error 1.34 (SD = 1.85) %. Bland-Altman limits of agreement plot indicated minimal systematic error in the measurement range of 54 bpm to 117 bpm. When compared to gold-standard ECG HR the FBC2 HR demonstrated good agreement in healthy young adults.Author owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.Biomedical engineeringElectronic Thesis or Dissertation2021-11-15AutonomicHeart rateWearable sensorWearablesWearable deviceConsumer wearablesValidationHeart rate reactivityStressStress reactivityBland–Altman plotsPsychophysiological dataECGPPGOptical heart rate monitoring