How is a constant aerobic heart rate workout better/different than a workout with sprints?!


Question: How is a constant aerobic heart rate workout better/different than a workout with sprints.?
How are the following different or better.?

CONSTANT EFFORT: Perform an aerobic exercise for one hour maintaining an aerobic heart rate the whole time.

VARIED EFFORT: Perform an aerobic exercise for one hour maintaining an aerobic heart rate but periodically increasing effort to a sprint.

According to a Yahoo "self-editor"

http://health.yahoo.com/experts/healthie...

"You can get an hour's worth of fitness and calorie burning in 20 short minutes." The article continues:

Pick any cardio you like (running, swimming, the elliptical trainer). Warm up for 2 minutes at a moderate pace, then sprint for 30 seconds at the highest intensity you can muster. Slow down and do 90 seconds at a catch-your-breath recovery pace. Repeat eight times. You'll torch more calories in less time, while you burn fat faster."Health Question & Answer


Answers:
yes that yahoo thing is right...but the main difference is what your burning....short burst of high intensity cardio, you just burn carbs (anaerobic)....workouts lasting longer than 20mins you start to burn fat as your main fuel...Health Question & Answer



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