The original article says that subjects were placed into either the Ibuprofen or Control groups based on their historical use during training and competition. But later they talk about the I group having used it the day before and the day of the race. They also note that they did not control for use of the drug in the weeks prior to the race. Which to me doesn't quite hold up the same definition of "historical" as one would think. Admittedly I don't have the time to print and read the whole article, but it seems that they assume the I group use it on a regular basis, but I don't see that they actually knew that. They gave them questionairres and I guess that is where they got that info, but it isn't spelled out very well in the article.

And I see nothing about athletes with injuries being excluded or treated as a sub-group in any analysis. But again, not a thorough read of the article.