ECG PDF Report Graph too small to read properly

[MelvinL]

Hi,

I have tested the ECG function on the Fitbit Sense several times, and noticed that the ECG graph from the PDF Export is very small due to the huge variations (peaks and troughs) of the graph during the first 2-3 seconds. To rephrase and explain further, the first 2-3 seconds of the graph will produce an inaccurate reading or noise, such that the peaks and troughs will be very extreme. After which, the graph will stabilise and show a more consistent ECG graph. But because of the extreme values during the 1st 2-3 seconds, the subsequent graph becomes very very small (the graph height is only about 10-20% the size of the background grid), and thus very difficult to read meaningfully.

(See attached examples found from other user reviews online, which indicates that this issue is common)

Is this expected? Or how can I avoid this issue to produce a more consistent graph? (I have tried it several times, relaxed, not moving, and not pressing too hard on the watch)

Else, I suggest that the Fitbit Sense should ignore the first 3 seconds after placing fingers on the watch corners, and start recording only after 3 seconds. I believe this should produce a more consistent and accurate result throughout, and can then generate a clearer, larger graph (graph peaks and troughs should maybe take up >50% of the grid background?).

Notice the extreme "noise" during the first 2-3s of the graph, and the tiny graph after that:

 

 

 

[LZeeW · Accepted solution]

@MelvinL   Removing those first 2-3 seconds won't change anything.  Do you see that little trace in the upper left that has squared off sides?  That segment is the ECG calibration waveform.  It takes up 10 small boxes because that is the standard for recording an ECG and it corresponds to 1 mV.  An ECG records the electrical activity of the heart.  The size of the waveform means something.  The normal spikes and rounded bumps should in a certain size range.

My husband was sent to a cardiologist who specializes in abnormal heart rhythms.  He didn't think much of wearable ECGs until he saw some of the Fitbit recordings.  These are very readable to someone who knows what they are looking for.

[MelvinL]

Would I be able to get an official reply or explanation of this from Fitbit?

Thanks.