Wrist-ECG

What does an ECG measure?

With every heartbeat, an electrical impulse travels through the heart, prompting its contraction and facilitating blood circulation.

An ECG records these electrical signals and provides a graphical representation to show how fast the heart is beating, the rhythm of the heart beats (steady or irregular), and the strength and timing of the electrical impulses as they move through the different parts of the heart. More specifically, the different waves of the ECG signal represent the sequence of depolarization and repolarization of the heart muscle’s atriums and ventricles.

How to record an ECG

An electrocardiogram is recorded by placing ten small patches, called electrodes, on the patient's skin, typically on the chest, arms, and legs. The electrodes are connected to an ECG machine that detects and amplifies the electrical impulses generated by the heart.

Outside the medical setting, the latest generation of wearables, like Polar watches equipped with Wrist-ECG and Elixir™ biosensing technology, can record an ECG at rest using just two electrodes placed on the back and the buttons of the device. All you need to do is place a finger on a button for 30 seconds.

Wrist-ECG and sports performance

The metrics provided by Wrist-ECG measurements allow you to monitor how your physical condition develops over time. For example, an increased heart rate variability—the fluctuation in the time intervals between consecutive heartbeats—typically indicates improved cardiovascular fitness and endurance. It is also a key indicator of stress and recovery.

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The science behind Wrist-ECG

Wrist-ECG safely records the resting ECG signal in just 30 seconds. To get an accurate measurement, wear the device snugly on your wrist, keep still, and place your other hand's finger firmly on the button during the test.