Interesting thread but there are quite a few interpretations of Vo2max intervals that seem to miss the point. The following quote is taken from a factsheet provided free on the Flamme Rouge website. I've provided the link for those of you that are interested.
'The fact that it takes between 60-180 seconds to physiologically reach your VO2max means the interval could be over before you've actually achieved any VO2max development!' http://www.flammerouge.je/content/3_fac ... maxdev.htm
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That's true, but there are ways of working around that technically speaking. A properly done 30/30 workout as discussed will significantly elevate your heart rate to around vo2 max power quickly and even though the power is variable it actually stays there quite long. Studies on the protocol (IIRC and I can't seem to find them) demonstrated significant oxygen debt and oxidative activity that bore the same physiological burden as traditional intervals done at or closely around vo2 max.
Development is a loose term. You don't develop from one interval, or even an interval session itself. Its a compound of everything you have done and will do and where it falls in the sequence of things. I notice almost nothing from sessions during a training block until I have properly recovered and my TSB has zeroed a bit. Tests have always shown, however, that power at those durations has risen even when I have done an entire block of the said protocol that supposedly will not influence MAP power.
Don't take me too seriously. GramzStrava