INTRINSIC MOTIVATION AND EXERCISE ADHERENCE

Two prospective studies tested the hypothesis that intrinsic motives f or physical activities facilitate long-term adherence. In Study 1, par ticipants in two physical activity classes Tae Kwon Do and Aerobics (N = 40), were compared in their motives for participating using the Mot ivation for Physical Activity Measure (MPAM; Frederick E Ryan, 1993). Participation motives were also used to predict adherence. Results sho wed that Tae Kwon Do participants were higher in enjoyment and compete nce motives and lower in body-related motives than those in aerobics. They, also showed better adherence. Further analyses revealed that gro up differences in adherence were mediated by enjoyment motives. Body-f ocused motives were unrelated to adherence. In Study 2, subjects joini ng a nautilus renter (N-155) rated their initial motives on a revised Motivation for Physical Activity Measure (MPAM-R). They also rated wor kout length, challenge, and enjoyment after each exercise session. Res ults revealed that adherence was associated with motives focused on en joyment, competence, and social interaction, but not with motives focu sed on fitness or appearance. Post-workout ratings of enjoyment also p redicted adherence. Discussion focuses on the importance of intrinsic motivation for exercise adherence.