Charge6 - fast jump in heart rate

[bulletBob19380]

I recently started using a Charge6. It has worked well with one exception. In the past week started using some new cardio machines at my local "Y".  When I start a session on the machine, my machine heart rate is consistent with what I see on my fitbit.  However, after a few minute, my fitbit heart rate soars very quickly to about  170 beats / minute.  When I check what the machine for it's heart rate, I see a rate that is about 120 beats / minute.  During this time my preserved effort is consistent with 120 beats / minute.  I haven't seen these sudden jumps durinbg my walks in hilly areas. Has anyone else experienced this? 

[bulletBob19380]

As a 67 YO Male, my max heart rate is between 161 and 153 beats per minute.

[Chrisbla · Accepted solution]

This has happened to me as well. I frequently see spikes in heart rate during workouts and thought it might be accurate since I had heart surgery and am still recovering. However, when I attended cardiac rehab I was on a heart monitor during workouts and even though my watch showed spikes the monitor was steady,  no spikes. I believe either certain arm movements or skipped heart beats may cause inaccurate readings. My cardiologist also said he hears this concern from many patients.