When do you burn more calories?

[Catrin]

Whichever one keeps your heart rate the highest. It would differ for different people so there isn't a definitive answer.

Agreed, each of our bodies are different and our bodies do become more efficient through exercise and proper diet. 3 years ago, when I was 60 pounds heavier, I didn't have to do much to drop 1 pound, or even 5...that changed of course. Our bodies adapt to our activity level so this is also something to keep in mind as time continues. As our cardiovascular endurance increases it does become more difficult to raise the heart rate.