What sensors do advanced wearables use to monitor heart health and oxygen levels?
Advanced wearable computers, such as smartwatches, often incorporate specialized sensors for health monitoring. These devices may include electrocardiogram (ECG) and blood oxygen saturation (SpO2) monitors alongside standard heart rate sensors.
✓ Accepted answer
Advanced wearables primarily use photoplethysmography (PPG) and electrocardiogram (ECG) sensors to monitor heart health and oxygen levels in 2026.
- PPG Sensors: These utilize green, red, and sometimes infrared LEDs to measure light reflection off the skin, allowing devices to calculate heart rate and blood oxygen saturation (SpO2) by analyzing how much light is absorbed by deoxygenated versus oxygenated hemoglobin.
- ECG Electrodes: Modern smartwatches feature conductive metal cases or dedicated electrode pads that capture the electrical activity of the heart. This technology provides a clinical-grade signal useful for detecting atrial fibrillation and other arrhythmias.
- Impedance and Temperature Sensors: Newer 2026 models increasingly integrate bioimpedance analysis to monitor hydration and body composition, while skin temperature sensors help detect inflammatory responses that may precede heart-related issues.
- AI Processing: Raw data from these sensors is processed by on-device machine learning algorithms developed by manufacturers like Apple and Samsung to filter noise and provide accurate, real-time health insights without constant cloud connectivity.
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