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# 1   2008-03-10 06:54:16 Why 150 ?

tybos
Member
Registered: 2007-08-07
Posts: 22

Why 150 ?

Hi,

I took a look at your code at I was surprised to see that you limited the measured heart frequency to 150 BPM.
It is a problem for sportsmen and women whose heart frequency can approach 200 !!
Is there a valid reason to limit this ?

Regards
Tybos

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# 2   2008-03-10 19:56:59 Why 150 ?

jingxizhang
Member
Registered: 2007-12-13
Posts: 35

Re: Why 150 ?

The person with heart rate over 150 BPM probably cannot hold the ECG Primer device steady (sorry, just kidding).
Actually, I was setting a temporal inhibition window after detecting the QRS wave to prevent the high T-wave mis-triggering the heart rate detector. The 150 BPM is arbitrary set by taking the half of normal RR-interval. Because the normal heart rate is 72 BPM and the heart rate for half of the normal RR-interval is 144 BPM. So I used 150 BPM. However, there is no reason to prevent shortening the window to cover the HR up to 200 BPM.

Jingxi Zhang

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