Pulsmätningen

Såhär skriver Fitbit själva:

"We have performed multiple internal studies to rigorously test the accuracy of PurePulse against heart rate chest straps, and we see only a small percentage difference across a variety of workouts.

Unlike chest straps, PurePulse is designed for all day wear and tracking, giving you a more complete picture of your health and fitness. By comparison, chest straps are only designed to be worn for a short duration, during exercise. They tend to be uncomfortable and can stop working if the skin is not kept damp during wear."