Unknown message slot CUSTOM_MSG_HEADER_SEARCH_FIND
Unknown message slot CUSTOM_MSG_HEADER_SEARCH_TIPS
We measure your heartbeat by optically measuring changes in your blood flow. This is done on the top of your wrist by shining light through the skin onto the capillary veins just below the skin and detecting the changing light reflections.
|See also:||My heart rate is not recorded properly. What do I need to do?|