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. Author manuscript; available in PMC: 2015 May 1.
Published in final edited form as: Med Sci Sports Exerc. 2014 May;46(5):1046–1052. doi: 10.1249/MSS.0000000000000183

Figure 3. Heart Rate using the Earbud (DUT) and the simultaneously measured ECG benchmark.

Figure 3

a) Regression relation comparing estimated (Earbud) vs. measured (ECG) heart rate for all data points collected for each participant and b) Bland-Altman plot of same. All the data points were taken from the training data collected during the Duke CPX test. The mean difference (bias) was −0.2% and the standard deviation was 4.4%. The mean is shown by the green line, and the 1.96 SD (95% limits of agreement) boundaries are shown by the red lines.