Heart rate measurements of wearable monitors vary by activity, not skin color

Biomedical engineers have demonstrated that while different wearable technologies, like smart watches and fitness trackers, can accurately measure heart rate across a variety of skin tones, the accuracy between devices begins to vary wildly when they measure heart rate during different types of everyday activities, like typing.

from Health & Medicine News -- ScienceDaily https://www.sciencedaily.com/releases/2020/02/200212121950.htm