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Two studies on the Theory of Planned Behavior (TPB) and exercise behavior are reported that consider the mediating and moderating effects of planning on intention-behavior relationships. Undergraduate students (N = 125 and N = 102) completed questionnaires assessing TPB constructs, planning, and past exercise behavior. The TPB was highly predictive of exercise intentions (R2 = .37 and .62) and future behavior (R2 = .43 and .49) assessed at 2 weeks (Study 1) and 1 week (Study 2) follow-up. Planning was found to mediate the impact of intention on future behavior (Study 2) and to moderate the intention/behavior relationship (both studies). The results are discussed in relation to recent models of health behavior that focus on the volitional (i.e., postdecisional) phase of health behavior.
Dept. of Psychology, University of Sheffield, Sheffield S10 2TP, U.K.
Institute of Psychological Sciences, University of Leeds, Leeds, LS2 9JT, U.K.