Common sense tells you that the longer the duration of exercise, the larger the energy expenditure – more calories burned. The intensity of the exercise – either as a percentage of maximum endurance capacity (VO2 Max) or maximum heart rate (220-age) – determines the type and percent of energy expended – carbohydrate (muscle and liver glycogen) and adipose fat (fatty acids and glycerol).When exercise is stopped, a process called enhanced or excess post-exercise oxygen consumption is activated ...