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paulvangentcom / heartrate_analysis_python

Python Heart Rate Analysis Package, for both PPG and ECG signals
MIT License
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some output measures are different in v1.2.6 #59

Closed handlercc closed 3 years ago

handlercc commented 3 years ago

Hi! I was running through the smart watch data and following your Analysing Smartwatch Data notebook but some of the output values differ a lot such as the sdsd and the rmssd, hoping there could be some analysis as to why or what these numbers would mean.

From the notebook: bpm: 78.981709 ibi: 759.669563 sdnn: 79.989043 sdsd: 99.586554 rmssd: 99.586688 pnn20: 0.385797 pnn50: 0.205374 hr_mad: 41.049817 sd1: 36.948123 sd2: 73.723698 s: 8557.548377 sd1/sd2: 0.501170 breathingrate: 0.239659

My output: bpm: 75.543450 ibi: 794.244901 sdnn: 92.544456 sdsd: 33.387928 rmssd: 49.947643 pnn20: 0.644444 pnn50: 0.244444 hr_mad: 35.056933 sd1: 34.389733 sd2: 85.202755 s: 9205.180571 sd1/sd2: 0.403622 breathingrate: 0.200000

paulvangentcom commented 3 years ago

Thanks for letting me know, strange indeed I see the same with a newer version of HeartPy.

Something to dig into, will keep you updated.

-Paul

paulvangentcom commented 3 years ago

Turns out some improvements in the rejection of peaks, as well as some changes to how plotting handles figures led to strange behaviour. I've updated the notebook to reflect these changes now.

In some areas HeartPy has become stricter. It probably detected quite some false positives in the earlier version, leading to an inflation of the HRV metrics.