Are you training for an endurance event or for physique purposes [rhetorical]?
Sprinting will do a number of things for you, besides improving cardiovascular conditioning burning a few extra calories.
1. Will increase anaerobic enzymes. Hence, you'll be better able to utilize CHO for high intensity work.
2. Increase glycogen synthase activity and density. Hence, more of the CHO you consume will be stored as glycogen.
3. Increase beta-oxidation enzymes. Hence, you will be more efficient at using fat for fuel.
4. Train the type II fibers of the lower body, as well as place more stress upon the global core (abs, obliques, etc.).
1-3 will improve nutrient partitioning. In other words, more of what you eat will go towards muscle vs. fat. All this from 2-3 sessions of 6-10 sprints per session.
Br