We are currently trying to perform spectral analysis on blood pressure with matlab. The device we used(Caretaker, Biopac) provides time position and amplitude of the peak according to the PDA model. The inter-peak interval was calculated by subtracting the time position of successive peak.
However, the interval between peaks were not uniform. We found that the process called interpolation should be performed before using FFT. So, instead of using FFT, we tried Lomb-Scargle periodogram(Reference: https://www.mathworks.com/help/signal/examples/spectral-analysis-of-nonuniformly-sampled-signals.html). The problem is, we don’t know how to calculate the blood pressure variability of interested bandwidth based on Lomb-Scargle periodogram. As a quick fix, we used trapz function on matlab to integrate the area under the curve of interested bandwidth.
But we are not sure about the validity of analyzing process. Is it OK to use trapz function on matlab to calculate the BPV of interested bandwidth on Lomb-Scargle periodogram?
First what are you measuring. BP has two componets, systolic and diastolic. What have you got? where is the cuff that measures blood pressure. IMO you need to look at where you get your data before you do any supermathematics. Then you might want consult an expert in chemometrics. I would suggest: Dr. Peter Harington, Chemistry and Biochemistry Dept, OHIO University, USA. Google this name to get full contact information and the ask his advice or perhaps even invite him to work with you. You may mention my name. Good luck, David Booth
First what are you measuring. BP has two componets, systolic and diastolic. What have you got? where is the cuff that measures blood pressure. IMO you need to look at where you get your data before you do any supermathematics. Then you might want consult an expert in chemometrics. I would suggest: Dr. Peter Harington, Chemistry and Biochemistry Dept, OHIO University, USA. Google this name to get full contact information and the ask his advice or perhaps even invite him to work with you. You may mention my name. Good luck, David Booth
Thank you for your suggestion! I might need to study more to understand my data and analysis procedure.
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