Explanation:
A: 1. Non-standard wearing methods, such as light leakage caused by incomplete fitting, arm swing and slight movement of the bracelet on the skin, etc.Wearing tight band, raising the arm and making a fist can affect blood circulation and may also affect heart rate signals.
2. Wear the band close to the joint.
3. There are more sweat stains on the band.
The right way to measure it: Lay the arm flat, relax and hold it still, while making sure the bracelet fits the arm tightly.
Note:
Under the correct condition, individual differences such as skin color, hair, tattoo and scar may also affect heart rate monitoring (brown skin and black skin cannot be measured, and darker skin can not be detected if it absorbs more green light).