Accuracy of Firstbeat Bodyguard 2: https://assets.firstbeat.com/firstbeat/uploads/2015/10/white_paper_bodyguard2_final.pdf We tested the accuracy of the BG2 RRI extraction against standard clinical ECG derived RRI during rest and different types of physical activity (walking,running, biking) in 19 healthy volunteers. BG2 detected onaverage 99.95% of the heartbeats (0.05% of beats missed) and had0.16% extra beat detection rate, with 2.96ms (0.54%) …