Here is a quick analysis of the heart beat reading accuracy of the fitbit HR compared with Garmin/Cycleops heart strap. As you can see the fitbit HR is inaccurate at high heart rates by about 40-50 bpm; at least under these test conditions where there is a fast build up to 145bpm. The two methods synched up around 113 BPM and lower.

In this video we also discuss heart rate zones based on max HR (for more see [ Ссылка ])

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