2/ Here is my IHHT protocol:

+ 35 days total
+ 26 biofeedback training sessions
+ 3:1 rhythm: three training sessions,one recovery

Cycle per Session (Biofeedback Mode):
+ 5 minutes training (hypoxia: SpO2 85→77%)
+ 3 minutes recovery (adaptive hyperoxia, 99% SpO2)
+ 5 cycles