World junior champion in Belgrade in 1982, Procházka missed the 1984 Olympics because of the Eastern Bloc's boycott but went on to win two medals at the 1987 senior World Championships in Duisburg, West Germany. In the individual C-1 500 m he was the silver medallist. He also won a bronze medal in the C-2 500 m with partner Alan Lohniský. At the 1988 Summer Olympics however he came a disappointing eighth in the C-1 500 m and ninth in the C-2 500 m.