Smartwatch blood pressure tracking: Which one is more accurate?
One-month test results comparing three popular smartwatches with Garmin.
1The global impact of hypertension
According to the World Heart Federation, high blood pressure affects 1.3 billion people worldwide and is the number one risk factor for death globally. In the US, half of adults have hypertension, with many unaware of their condition. Regular home monitoring is crucial, especially for those with white coat syndrome.
2Tested devices and methodologies
The test included Samsung Galaxy Watch Ultra, Amazfit Cheetah 2 Ultra, and BP Doctor Fit. Samsung and Amazfit use algorithm-based measurements with cuff calibration, while BP Doctor Fit employs inflatable wristband technology. Garmin Index BP Monitor served as the reference device, with measurements taken at different times of day.
3Measurement processes and ease of use
BP Doctor Fit requires a single button press for inflation (30-60 sec). Samsung Health Monitor needs monthly cuff calibration. Amazfit offers one-touch measurement. Since Amazfit models are approved outside the US, account location must be set to Brazil for blood pressure functionality to work.
4BP Doctor Fit's unexpected results
Despite mimicking arm cuffs, BP Doctor Fit measured 15 mmHg higher systolic than Garmin, though diastolic readings were within 2-4 mmHg. It produced the most inconsistent results and frequent errors, requiring multiple attempts. The inflatable wristband technology was found uncomfortable during testing.
5Samsung vs. Amazfit performance
Samsung Galaxy Watch Ultra measured 12-14 mmHg higher systolic and 10 mmHg lower diastolic than Garmin. Amazfit Cheetah 2 Ultra stayed within 2-4 mmHg for both readings, showing remarkable consistency. Amazfit also led in user experience with simpler operation.
6Final verdict and recommendations
The month-long test proved Amazfit Cheetah 2 Ultra delivers clinical-grade accuracy. While FDA-cleared Samsung has US market advantages, Amazfit outperformed in precision. As Apple Watch is expected to add this feature, sports watch manufacturers should prioritize blood pressure monitoring capabilities.
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