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I've been searching everywhere, but I'm having trouble finding a step-by-step guide for someone with little knowledge of signal processing.

I have a file with a list of RR-intervals in milliseconds. The RR-interval is the time between successive heartbeats, so if you took the cumulative sum, you could think of it as a timestamp for each heart beat.

One method of calculating heart rate variability is to find the ratio of power between the low frequency band (0.04 - 0.15 Hz) and the high frequency band (0.15 - 0.40 Hz) in the heart rate signal.

How can I find these values? The RR-intervals aren't like an evenly sampled signal, so I think resampling would be involved. Thank you very much.

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Here is a link with a bunch of stuff relating to HVR and how to calculate various features using python discrete-heart-rate-signal-using-python-part-1. Hope it helps.

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