“…Whether exercise improves depressive symptomatology in a general older population has been less consistently demonstrated in trials; some have been positive (Blumenthal et al, 1991;Coyle & Santiago, 1995;King, Taylor, & Haskell, 1993;McMurdo & Rennie, 1993;Williams & Lord, 1997), whereas others have yielded null effects (Dustman et al, 1984;Emery & Gatz, 1990;Jette et al, 1996;King, Taylor, Haskell, & DeBusk, 1989;McMurdo & Burnett, 1992;Pierce, Madden, Siegel, & Blumenthal, 1993). Consequently, it has been suggested that the antidepressive effect of exercise is most likely due to normalizing depressed mood states in older participants who have high initial depression levels rather than to inducing improvements in all older participants (Craft & Landers, 1998;King et al, 1993;Williams & Lord, 1997).…”