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. Author manuscript; available in PMC: 2018 Nov 1.
Published in final edited form as: PM R. 2017 Apr 9;9(11):1077–1084. doi: 10.1016/j.pmrj.2017.03.012

Figure 1.

Figure 1

Time-series data for nine subjects; A–F show representative subjects (4, 21, 2, 5, 11, and 14, respectively) with heart rate data closely aligned for both Fitbit Charge HR and EKG. In contrast, G–I are subjects (3, 13, and 20, respectively) for whom there was large disagreement between the two devices.