Wilson V E, Morley N C, Bird E I
Percept Mot Skills. 1980 Feb;50(1):117-8. doi: 10.2466/pms.1980.50.1.117.
10 marathon runners and 10 joggers reported less depression on an adjective check list than 10 non-exercisers, as well as less confusion, more vigor. Marathoners scored better on each than joggers.