Fitt APP not showing peak BPM it has 124 as top when I was up to 148 on my Fitbix LUX.

[SuzyQC69]

The Fit APP doesn't seem to accurately capture BPM, its graphing throughout the day, but its as if it will only capture the BPM if it stays there for several mins.  My BPM was over 140 almost 150 for a couple mins in cardio range on my Fit luxe yet I noticed it peaks at only 124 on the Fit APP.  I wear my fit luxe to bed to identify if I have any heart rate spikes, clearly the APP is not accurately even picking up what the Fit luxe captured.  Why?  

[LZeeW]

Hello @SuzyQC69 and welcome to the Community.  Your Luxe looks at your heart rate on a beat-to-beat basis.  This is is basis for the Irregular Rhythm Notifications.  How it gets displayed in the app is a different story, depending on the graph.  Your daily heart rate graph shows a number that is averaged over five minutes.  Your exercise details and your sleeping heart rate graph (if you subscribe to Premium) show a number that is averaged over one minute.  Your daily heart rate graph will never show the highest high or the lowest low.  Those values get smoothed out.