Analyzing Polar session HR data in Kubios 3 4 Free Edition
Channel: Tyson Sapre
Date: 28/02/2021

*Recording is for educational purposes only - always consult a licensed physician for ANY health concerns

From Kubios regarding video and method: 

"Please note that conversion of HR [bpm] data into RR interval [ms] data is possible only if the HR data is provided beat-by-beat. Meaning that you would have HR value computed from every successive beat interval. 

The file that you export from Polar Flow manually gives averaged HR data at 1-sec intervals, you cannot extract RR interval data from this. When you do this conversion for averaged HR data, what you get is averaged RR interval data, which is missing most of the high frequency variation of HRV. Beat-to-beat RR interval data is required for HRV analysis, thus we cannot recommend this procedure.

If you are using Polar equipment, you can have the beat-to-beat RR interval data from Polar Flow by using Kubios HRV Premium (it exports the RR data from Flow using Polar API)."
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Calculation source: https://www.quora.com/Can-RR-interval-be-calculated-from-BPM

How to export/convert Polar data for analysis in Kubios 3.4 Free Edition - macOS Catalina 10.15.5 
Data collected from H10 chest band HR monitor to Polar iOS app

See recording for caveats - truncated data,  conversion accuracy, etc. - Please comment on known solutions and or comment inaccuracies - Thanks

Apologies for the amateur software knowledge

Polar recording is from shift of outdoor manual labor - moving, cleaning fitness equipment(benches, dumb bells, plates, etc) - that accidentally led to "heat exhaustion" after an abrupt weather transition to dry, hot conditions toward end of session