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If you want meaningful adaptations to your engine you need loads of ez aerobic work. Your hiit gains are fast and fleeting.
Does HIIT increase the demand on the cardiovascular system? That is, will cardiac output - heart rate, stroke volume temporarily increase? Clearly yes. Are these short term increases sufficient for the remodeling of the heart required for large increases in VO2max? No.
If you want meaningful adaptations to your engine you need loads of ez aerobic work. Your hiit gains are fast and fleeting.