The exhaustive intermittent training consisted of seven to eight sets of 20-s exercise at an intensity of about 170% of VO2max with a 10-s rest between each bout.
First, are you certain you were at 170% of VO2max? My understanding is that only the top level elite athletes can even get close to 170% of VO2max.
Secondly, what does it mean to be 170% of VO2max? What is VO2max?
"the highest rate of oxygen consumption attainable during maximal or exhaustive exercise"
How does one consume more than 100%? 170% of VO2max sounds like that activity or exercise has gone anaerobic to me. If that's indeed the case, there must be more effective ways to exercise anaerobically.