It had been assumed that low-intensity exercise burns a greater percentage of calories from fat as opposed to carbs, however, when high-intensity exercise is practiced, research shows the percentage of fuel from carbs is increased, while the amount of fat utilized is greater than or equal to that burned during low-intensity exercise.
In research, HIIT has been shown to burn adipose tissue more effectively than low-intensity exercise—up to 50% more efficiently! In other words, HIIT speeds up your metabolism and keeps it revved up for some time after your workout. The bottom line is HIIT training burns a greater number of total calories than low-intensity training, and more calories burned equals more fat lost.
A study at Laval University in Quebec, Canada found that HIIT cardio helped trainees loose nine times more fat than those who trained the traditional way (moderate speed for 20-60 minutes). Combine HIIT with your weight program and you boost your metabolism through the roof!
The reason that HIIT is so successful is this:
When you work at a high intensity, you burn more total calories per pound of body weight.
High Intensity workouts such as weight training and HIIT boost growth hormone levels.
Elevates the body's metabolism throughout the ENTIRE DAY!
What does this mean for you? The more calories that you burn in a day, the more weight you are able to lose.
HIIT will not only help your cardiovascular system, but will train the Anaerobic, ATP/CP system as well. Not only will you increase your cardiovascular endurance but also improve your raw speed and explosiveness.
(I found this information on HIIT by looking at a few websites).
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