American scientists have published a study according to which the fitness bracelets and smart watches are not able to accurately measure the pulse of the person.
Participated In the test of optical heart rate monitors built into Charge HR , Apple Watch, Mio Alpha and Basis Peak.
To do this, the staff of the cardiovascular Institute of the Cleveland clinic, invited 50 healthy volunteers with normal body weight and using wearable devices measured heart rate at rest, during exercise of varying intensity and during recovery. In parallel, the heart rate was recorded using ECG and chest monitor Polar H7. Data measurements included the heart rate from 49 to 200 per minute.
It Turned out that the Basis Peak overstates the pulse at moderate stress: the discrepancy between the ECG 8.9 and 7.3 beats per minute at a speed of 3.2 and 4.8 km/h respectively. Fitness tracker Charge HR from Fitbit underestimated the value of under intensive workloads, 7.2 and 4.6 beats per minute when at 6.4 and 9.6 km/h.
95% of the pulse values measured with the Apple Watch and the Mio Alpha, ranged from -27 to 29 beats per minute compared with ECG. Have the Charge HR, this figure ranged from -34 to 39 beats per minute, and the Basis Peak from -39 to 33.
The Scientists noted that the most accurate device worked by measuring heart rate of a person at rest. However, the chest monitor provided a much higher accuracy of data. Body mass, gender and age of participants on the measurement results are not affected.