研究目的
Investigating the feasibility of a wrist-worn device using photoplethysmography (PPG) to accurately measure both heart rate and respiration, providing a more holistic picture of human health.
研究成果
The device demonstrated the ability to accurately measure both heart rate and respiration from the wrist using PPG, with results agreeing closely with a commercial reference device. Future work includes optimizing algorithms for faster refresh rates and validating the device with a larger number of subjects.
研究不足
The study was conducted on a small sample size of two participants. Additional frequency components observed may be due to system baseline drift, requiring further investigation.
1：Experimental Design and Method Selection:
The device uses a photodiode, transimpedance amplifier, and specifically tuned bandpass filters to extract heart rate and respiration from the PPG signal.
2：Sample Selection and Data Sources:
Tested on two male participants aged 25-34 years.
3：List of Experimental Equipment and Materials:
Includes a 9DoF inertial measurement unit, PCF8523 real-time clock, SD card, OLED display, ARM Cortex M0 Bluetooth microcontroller, and custom designed printed circuit boards.
4：Experimental Procedures and Operational Workflow:
Participants wore the device on their wrist and a reference chest strap. Measurements were taken in different positions (seated upright and sleeping).
5：Data Analysis Methods:
Discrete Fourier transform (DFT) was used to analyze the frequency content of the signals for heart rate and respiration.
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