If you burn glucose during exercise, you tend to burn more fat the rest of the day. If you burn fat during exercise, you burn more glucose during the day. It is therefore concluded that the type of cardiovascular exercise performed is irrelavant, so long as total calorie expenditure remains the same.
Brybner, BW. The effects of exercise intensity on body composition, weight loss, and dietary composition in women. Journal of American College of Nutrition, (1997) 16: 68-73
Interesting. I have to say from personal experience that I would agree!