Yours is the very best way to burn fat!
The only thing I’d change, or be aware of is worrying about specific duration (other than your warm-up). I discuss this in my soon to be released steroid.com women’s fitness section. The key for you is not be a slave to the clock, but rather instinctually train to the point of near exhaustion, then reduce speed for recovery and repeat. There is a general consensus myth that moderate-paced cardio training (the Fat Burning Zone) is the superior fast or HIIT training, but that’s not what the numbers relate.
Note: In clinical studies with OBESE subjects, changes in fat oxidation were NOT significantly different among groups.
http://jap.physiology.org/cgi/content/full/92/3/1300
Here’s an excerpt from my women's section:
Low Intensity (L.I. for short) burns about 50% fat for fuel while High Intensity (H.I.) burns about 40%. This is not a big difference. But say, for example, one burns 100 calories in 20 minutes of L.I. work, compared to 160 calories in 10 minutes of HI work. Performing HI actually burns more total fat, and does so in only half the time as illustrated below:
Low Intensity
100 calories x 50% = 50 calories
High Intensity
160 calories x 40% = 64 calories
In addition, HI training will also boost the metabolism long AFTER the workout is done. This post-workout fat burning effect does not accompany LI training. Even though HI training is a powerful fat loss tool, it should only be used by those who have already attained a good level of cardiovascular fitness. The basic idea when trying to lose fat is to create a caloric deficit that prompts the body to release stored energy, a.k.a. fat. The type of training does not matter nearly as much as creating this deficit, bringing us back to the paramount importance of diet and muscle building, but as illustrated above HI training creates this deficit more efficiently than LI training.
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As for the information in the recent Japanese study, I don't think it's a matter of either or, but rather both. If time permits you’d do well to implement this info, in other words, maintain your regimen but within their timing template (30/20/30). This would be the best of both worlds.
Best to you.