One season of professional rugby could be enough to see a decline in a player's blood flow to the brain and cognitive function, a new study claims. The University of South Wales research followed a professional rugby team over the course of a season, testing players pre-season, mid-season and post season. It will be published in Wednesday's September edition of the Journal of Experimental Physiology. Researchers followed a team playing in the United Rugby Championship. They say more research is needed on the