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Why heart rate from the head and not wrist?

Wrist-worn heart rate devices are affected by the movement of your arm, flexing of your wrist, sweat, and light. In other words, there are many external factors and motion that could prevent an accurate reading from wrist-worn wearables.

Monitoring heart rate by placing a sensor on your head is far more effective due to fewer moving parts under the skin (less muscle constriction and bone movement), which lets the sensor excel at doing what it is designed for - measuring your pulse.

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