Another interval study

Just for completeness, I thought I'd point to this one:

Two Minutes of Sprint-Interval Exercise Elicits 24-hr Oxygen Consumption Similar to That of 30 min of Continuous Endurance Exercise

Eight male students did either 30 minutes of endurance exercise or two-minutes of sprint intervals (it is not clear from the abstract what this was), three times a week for six weeks. 

Their oxygen consumption (VO₂) during and after 24 hours of exercise was measured and while it was 150 percent higher during endurance exercise than during the sprinting intervals, after 24 hours the overall amount of oxygen consumed between athletes was nearly identical.

There is a lot of debate about EPOC and what it means for calorie burn.  Here is another one to through in the mix