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Lissette Ruberte
04-22-2005, 03:31 AM
I am trying to estimate the power spectral density of EMG data I collected from the erector spinae muscles using bipolar surface electrodes (smapling rate 500 Hz).
I have noticed that my data is not zero at 0Hz even after detrending (both raw data and filtered data). Detrending also considrably reduces the ampitude of the curve. I am not sure if these results are correct. Can anyone provide some feedback about the power spectral density curve at 0Hz.

Thanks in advance,

Lissette M. Ruberte
Northwestern University
l-ruberte@northwestern.edu