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I am trying to extract heart rate value of different time points from the H.R. channel of shhs1 and the PR channel of shhs2. The issue is that I have come across some very atypically low values in the mentioned channels. These values mostly come up towards the end of the recordings (but happen more sporadically during the night as well).
As an example I have the value 0.00381476 for the heart rate of subject 200001 in shhs1 for the last approximately 3000 seconds of the night. Is there an explanation for this or is there maybe an issue with the way I am handling the data?
Thanks in advance!
Thanks for using the site. It sounds like you've encountered artifact. Perhaps you could exclude impossible/implausible values. Certain sensors may not have been worn when the recording started, may have come loose in the middle of the recording, may have been removed before the recording ended, etc.