I just read this over on Big Bottom Blogger:
"In an article entitled ‘Forget the Fat-Burn Zone’, Clarence Bass cites research done by a group of Canadian scientists, headed by Angelo Tremblay, Ph.D. Tremblay, et al, compared the results of an Endurance Training (ET) program versus High-Intensity Interval Training (HIIT) on fat loss:
“As you might expect, the total energy cost of the ET program was substantially greater than the HIIT program. The researchers calculated that the ET group burned more than twice as many calories while exercising than the HIIT program. But (surprise, surprise) skin-fold measurements showed that the HIIT group lost more subcutaneous fat. ‘Moreover,’ reported the researchers, ‘when the difference in the total energy cost of the program was taken into account..., the subcutaneous fat loss was nine-fold greater in the HIIT program than in the ET program.’ In short, the HIIT group got 9 times more fat-loss benefit for every calorie burned exercising.”
That was encouraging for me, seeing as I've been doing HIIT but noticing it doesn't burn NEARLY as many calories as, say, doing 45 minutes on the elliptical. So I'll keep on keeping on! I still plan to do the Shred. But maybe I can add in 20 minutes of HIIT 3x a week as well. We'll see how it goes!