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Photoplethysmography (PPG): Origins to Modern Applications in Wearable Technology

This lecture delves into the world of Photoplethysmography (PPG), a non-invasive technology used in various health monitoring devices. We explore its historical roots, beginning in the 1930s, and trace its evolution to contemporary applications in wearable technology. The video covers the basics of PPG, including how it measures blood flow using light, and details the signal processing techniques that transform raw data into meaningful health metrics like heart rate and oxygen saturation. Additionally, we discuss the diverse applications of PPG in detecting heart arrhythmias, respiratory rate, blood pressure, and sleep apnea, highlighting its potential to revolutionize both clinical and consumer health monitoring. Finally, we look ahead to future advancements and the broader implications for public health surveillance and remote healthcare monitoring. 0:00 Introduction 0:56 The history of PPG 2:02 Measuring blood flow with PPG 3:03 Sensor locations and other considerations 4:37 PPG signal processing 7:05 Practical use of PPG: measuring HR, Blood SPO2, Respiratory rate, Blood Pressure and Sleep apnoea 11:48 Concluding remarks References: https://doi.org/10.1016/j.ahj.2021.04... https://doi.org/10.1016/j.lanepe.2023... https://doi.org/10.1016/j.lanepe.2023... https://doi.org/10.1016/j.lanepe.2023... https://doi.org/10.1016/j.lanepe.2023... https://doi.org/10.1016/j.lanepe.2023... https://doi.org/10.1016/j.lanepe.2023... https://doi.org/10.3181/00379727-37-9... https://doi.org/10.1056/NEJMoa1901183 https://doi.org/10.1007/s11036-019-01... https://doi.org/10.1007/s40279-024-02...