I processed an ECG signal using findpeaks in Octave. Then, I plotted the amplitude of the "peaks" found by that function and got the followinge result (original unprocessed ECG signal on top, simple plot of "peaks" on bottom).

ECG Signal and (possibly) breathing signal?

If I analyze the "peaks" signal, I get a frequency of about .07 Hz, which translates to about 14 events per minute. This correlates nicely with breathing rate. Is that really the breathing rate that I found, or am I jumping the gun? I've heard this may be referring to a "DC Drift"?


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