hrotha said:The boost of doping is lower than in cycling, but the risk of being caught is much, much smaller. Blood tests aren't really done. They look for steroids and recreational drugs. It's basically a free boost with no risk of being caught, so even if it only gave you a 1% advantage it would be worth it.
Think of Ronaldinho. How useless was he when he got fat?
I don't buy the first claim. The typical midfielder (think Xavi) runs 8-10 km during a 90 minute game. It matters a lot how "fresh" he is in the 80th minute. For a team like Barca this is an integral part of its attack - control the ball and wear the other side down - since you have the ball they can't score - and when they get tired, you can. The marginal benefits to doping seem clearly quite substantial, particulaly when one considers that a single goal can decide a match.
Ronaldinho is probably not the best example. He was never renowned for spending time in the gym (except to avoid practicing), and he is naturally a tremendous athlete.