SkinDeep Sensor

The SkinDeep™ Sensor Technology was developed to provide continuous heart rate detection without the need for an uncomfortable chest strap. The SkinDeep™sensor emits blue light into the skin. Some of this blue light is absorbed by the hemoglobin traveling through the index finger. The light reflected back to the sensor varies in intensity as the amount of hemoglobin changes due to the pumping of blood. The SkinDeep™ sensor measures the changes in light intensity and feeds it into a special algorithm that converts it into heart rate data.

Because blue light has a much shorter wavelength it cannot penetrate deep into body tissue. Therefore, the index finger is used because there is good blood flow close to the skin surface.