EPOC is excessive post-exercise oxygen consumption which is associated with increased energy expenditure after exercise. In a study researchers hypothesized that women who had strength trained regularly would experience reduced post-workout energy expenditure compared to women who had not trained regularly. The study compared energy expenditure of the two groups 20, 40, 60, 90, and 120 minutes post-exercise.
Interestingly the result was not what they had hypothesized. From an article commenting on the study Energy Expenditure After Exercise, Part 2: