Recommended Further Reading
Wearable Photoplethysmographic Sensors—Past and Present
Optical Heart Rate Monitoring: What You Need to Know
Heart Rate Monitors – How do they work?
Best heart rate monitors and HRM watches
Five Challenges of Optical Heart Rate Monitoring
Wearable Device Technology for Accurately Monitoring Heart Rate from the Wrist
ECG vs PPG for heart rate monitoring which is best?
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