When I was a teen I called the ADA about this, and they said that "normal" people use the same amounts of insulin as we do, in proportion of course to what they are eating (if they eat nothing they'll use less insulin than if they eat three Cheesecake buffets).
Now that I think about it, I would also think that there is a wide variance between each individual and how much insulin they need to control their sugars, just like you and I and everyone else here seems to have varying carb ratios and basal needs.
Off-topic: What kind of competition? Fitness competition? If so, let me encourage you to partake in the "Names with faces" thread...
(hee hee, okay, I'll stop)