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I dusted off my Powerbreathe and spent six weeks training twice a day to see the effect. It not only improved my wearable metrics significantly (HRV, RHR) but also led me to run further in my estimated VO2max test.
I wrote up my results here: 9to5strength.com/powerbreathe...
Research paper: journals.lww.com/acsm-msse/Fu...
Chapters
00:00 Introduction
00:14 Powerbreathe Device
01:21 Wearable Results
02:47 Estimated VO2max Results
03:37 Research Paper
04:43 Conclusions