Estimation of Heart Rate and Energy Expenditure Using a Smart Bracelet during Different Exercise Intensities: A
Yihui Cai1, Zi Wang1, Wanxia Zhang1
1School of Sports Medicine and Rehabilitation, Beijing Sport University, Beijing 100084, China.
Sensors (Basel, Switzerland)
|July 9, 2022
Summary
The Lexin Mio smart bracelet accurately measures heart rate (HR) but is less reliable for estimating energy expenditure (EE) across various activity levels and intensities.
Area of Science:
- Sports Science
- Biomedical Engineering
- Wearable Technology
Background:
- Wrist-worn wearables are increasingly common.
- Assessing their accuracy in diverse conditions is crucial.
- The reliability and validity of smart bracelets for physiological monitoring require investigation.
Purpose of the Study:
- To evaluate the Lexin Mio smart bracelet's accuracy.
- To assess its reliability and validity for heart rate (HR) and energy expenditure (EE) measurements.
- To examine performance across varied physical activity levels and exercise intensities.
Main Methods:
- 65 participants underwent maximal oxygen uptake and running tests.
- Measurements were taken using the Lexin Mio, Polar H10 HR band, and gas-analysis system.
- Reliability (left/right, test-retest) and validity were assessed.
Main Results:
- Mio showed good reliability and validity for HR measurement (MAPE < 10%, ICC > 0.4).
- Mio demonstrated good reliability for EE on the right wrist but low test-retest reliability on the left.
- EE validity was low for the Mio bracelet (MAPE > 10%, ICC < 0.4).
Conclusions:
- The Lexin Mio offers reliable and valid heart rate (HR) tracking in laboratory settings.
- While reliable for energy expenditure (EE) on the right wrist, its validity for EE estimation is limited.
- Further research may be needed to improve EE accuracy in wearable devices.
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