[P2–573]: EFFECTS OF AEROBIC EXERCISE ON BRAIN METABOLISM AND GREY MATTER VOLUME IN OLDER ADULTS: RESULTS OF THE SMART TRIAL. (1st July 2017) - Matura, Silke; Tesky, Valentina A.; Pilatus, Ulrich; Hattingen, Elke; Fleckenstein, Johannes; Vogt, Lutz; Banzer, Winfried; Deichmann, Ralf; Lienerth, Bianca; Pantel, Johannes