This experiment was designed to examine the effects of resistance exercise on a manipulated preexercise mood. Participants were 40 undergraduate males who were randomly assigned to either resistance exercise or no-exercise, placebo activity. Prior to each session, participants were exposed to 1 of 3 mood inductions: positive, negative, or neutral, each of which was induced through the use of guided imagery. Resistance exercisers in the control condition reported increased anxiety and anger within 5 nun postexercise. This quickly dissipated, with anxiety falling below baseline values within 30 min postexercise. Neither condition was able to maintain the manipulated positive mood. Likewise, both conditions reduced the manipulated negative mood. However, the mood-enhancing effect of the placebo activity plateaued within 15 min. while the anxiolytic effect of exercise continued throughout recovery.
John B. Bartholomew is with the Department of Kinesiology and Health Education at the University of Texas at Austin. 222 Bellmont Hall, Austin, TX 78712.