Quote:
Originally Posted by Bring_Back_Shantz
I'm just gonna comment on the bike portion of your workout.
If you're trying to lose weight/burn fat, doing HIIT may not be the best way to go about doing it, especially if you eat before hand.
If you're doing really high intensity, you'll definitely be in an anaerobic state, and when you're in that state, you're body will burn carbs first becasue it can't use fat fast enough to meet the energy demands.
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The type of macronutrient your body uses for energy is not an indicator of how many calories an activity burns. You're right, high intensity has a higher RER and consequently utilizes carbohydrates more than fat, but overall "fat loss" has nothing to do with this, but rather the amount of calories the workout burned overall (and if you're in a caloric deficit). Short term, the source of energy will be replaced regardless if it's fat or glycogen / glucose; weight loss is much more long term than that.
With the same duration, a HIIT workout will burn more calories than an aerobic workout always. If you think about it, the harder you work the more calories you're burning, it's pretty simple. Though keep in mind you can't sustain HIIT nearly as long as aerobic so you should be including both in your regime.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2991639/