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I'm doing HIIT for VO2 improvement and wondering if that'll help with fat loss as well.

I've read a lot of conflicting reports, including one fellow who said "there a study on this that will be published soon" (but no date on th article (arrggg!).

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Found this research

Which compared Endurance Training vs. HIIT showing that relative to the energy expended, HIIT was 9x as effective in reducing fat.

(This isn't exactly the comparison I was looking for but it's a good start)

But this other study contradicts that

This study suggests that fat loss is a function of energy expended rather than exercise intensity.

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I think making it relative to energy use is skewing the results. Most HIIT I know, e.g. tabata, use a lot less energy than an endurance workout. I'm also skeptical of that result, as I've read more that says lower intensity is better for burning fat. – andrewb Nov 27 '13 at 7:05

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