For higher Fitzpatrick classifications, more melanin is present in the skin. The sensor may have
to work harder to find pulse which can require slightly more battery power
Tattoos Can Affect Heart Rate Accuracy
Tattoos can impact heart rate sensor accuracy and performance. In some cases the optical sensor
may not even turn on. The ink, pattern, and saturation of some tattoos can block light from
reaching the sensor, potentially making it difficult to get a reliable heart rate reading. Garmin
recommends that the watch be worn in an area free of tattoos.
