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Bland–Altman plots comparing heart rate measurements from four smartwatches against the Polar H10 reference. (a) Apple Watch shows negligible bias ( − 0.05 BPM) with tight limits of agreement ( − 6.20 to 6.09 BPM), indicating strong agreement. (b) Garmin smartwatch demonstrates a small bias ( − 0.70 BPM) and moderate limits of agreement ( − 11.31 to 9.90 BPM), suggesting stable performance across heart-rate ranges. (c) <t>ThaiSook</t> smartwatch exhibits a larger negative bias ( − 5.27 BPM) with wide limits of agreement ( − 34.54 to 23.99 BPM), reflecting substantial variability and sensitivity to motion artifacts. (d) Xiaomi smartwatch shows an underestimation tendency ( − 3.62 BPM) and broad limits of agreement ( − 29.64 to 22.39 BPM), particularly at higher heart rates.
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Bland–Altman plots comparing heart rate measurements from four smartwatches against the Polar H10 reference. (a) Apple Watch shows negligible bias ( − 0.05 BPM) with tight limits of agreement ( − 6.20 to 6.09 BPM), indicating strong agreement. (b) Garmin smartwatch demonstrates a small bias ( − 0.70 BPM) and moderate limits of agreement ( − 11.31 to 9.90 BPM), suggesting stable performance across heart-rate ranges. (c) <t>ThaiSook</t> smartwatch exhibits a larger negative bias ( − 5.27 BPM) with wide limits of agreement ( − 34.54 to 23.99 BPM), reflecting substantial variability and sensitivity to motion artifacts. (d) Xiaomi smartwatch shows an underestimation tendency ( − 3.62 BPM) and broad limits of agreement ( − 29.64 to 22.39 BPM), particularly at higher heart rates.
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Bland–Altman plots comparing heart rate measurements from four smartwatches against the Polar H10 reference. (a) Apple Watch shows negligible bias ( − 0.05 BPM) with tight limits of agreement ( − 6.20 to 6.09 BPM), indicating strong agreement. (b) Garmin smartwatch demonstrates a small bias ( − 0.70 BPM) and moderate limits of agreement ( − 11.31 to 9.90 BPM), suggesting stable performance across heart-rate ranges. (c) ThaiSook smartwatch exhibits a larger negative bias ( − 5.27 BPM) with wide limits of agreement ( − 34.54 to 23.99 BPM), reflecting substantial variability and sensitivity to motion artifacts. (d) Xiaomi smartwatch shows an underestimation tendency ( − 3.62 BPM) and broad limits of agreement ( − 29.64 to 22.39 BPM), particularly at higher heart rates.

Journal: Frontiers in Sports and Active Living

Article Title: Impact of central adiposity on the heart rate and calorie estimation accuracy of diverse smartwatches and the resulting subjective exercise experience

doi: 10.3389/fspor.2026.1829700

Figure Lengend Snippet: Bland–Altman plots comparing heart rate measurements from four smartwatches against the Polar H10 reference. (a) Apple Watch shows negligible bias ( − 0.05 BPM) with tight limits of agreement ( − 6.20 to 6.09 BPM), indicating strong agreement. (b) Garmin smartwatch demonstrates a small bias ( − 0.70 BPM) and moderate limits of agreement ( − 11.31 to 9.90 BPM), suggesting stable performance across heart-rate ranges. (c) ThaiSook smartwatch exhibits a larger negative bias ( − 5.27 BPM) with wide limits of agreement ( − 34.54 to 23.99 BPM), reflecting substantial variability and sensitivity to motion artifacts. (d) Xiaomi smartwatch shows an underestimation tendency ( − 3.62 BPM) and broad limits of agreement ( − 29.64 to 22.39 BPM), particularly at higher heart rates.

Article Snippet: While the low-cost Xiaomi and ThaiSook watches exhibited higher HR errors during motion-intensive activities, their derived calorie expenditure estimates remained remarkably stable and consistent with the reference standard.

Techniques:

Bland–Altman plots comparing heart rate measurements from four smartwatches against the Polar H10 reference. (a) Apple Watch shows negligible bias ( − 0.05 BPM) with tight limits of agreement ( − 6.20 to 6.09 BPM), indicating strong agreement. (b) Garmin smartwatch demonstrates a small bias ( − 0.70 BPM) and moderate limits of agreement ( − 11.31 to 9.90 BPM), suggesting stable performance across heart-rate ranges. (c) ThaiSook smartwatch exhibits a larger negative bias ( − 5.27 BPM) with wide limits of agreement ( − 34.54 to 23.99 BPM), reflecting substantial variability and sensitivity to motion artifacts. (d) Xiaomi smartwatch shows an underestimation tendency ( − 3.62 BPM) and broad limits of agreement ( − 29.64 to 22.39 BPM), particularly at higher heart rates.

Journal: Frontiers in Sports and Active Living

Article Title: Impact of central adiposity on the heart rate and calorie estimation accuracy of diverse smartwatches and the resulting subjective exercise experience

doi: 10.3389/fspor.2026.1829700

Figure Lengend Snippet: Bland–Altman plots comparing heart rate measurements from four smartwatches against the Polar H10 reference. (a) Apple Watch shows negligible bias ( − 0.05 BPM) with tight limits of agreement ( − 6.20 to 6.09 BPM), indicating strong agreement. (b) Garmin smartwatch demonstrates a small bias ( − 0.70 BPM) and moderate limits of agreement ( − 11.31 to 9.90 BPM), suggesting stable performance across heart-rate ranges. (c) ThaiSook smartwatch exhibits a larger negative bias ( − 5.27 BPM) with wide limits of agreement ( − 34.54 to 23.99 BPM), reflecting substantial variability and sensitivity to motion artifacts. (d) Xiaomi smartwatch shows an underestimation tendency ( − 3.62 BPM) and broad limits of agreement ( − 29.64 to 22.39 BPM), particularly at higher heart rates.

Article Snippet: Participants wore four commercially available wrist-worn smartwatches throughout the entire 45 min exercise protocol: ThaiSook Watch, Garmin Forerunner 245, Apple Watch SE, and Xiaomi Watch Lite.

Techniques: