As the report declares the TRA/TPB suggests subjective norms reflect the summed products of the following 2 factors: the individuals beliefs that referents influence the behavior in question; and his or her motivation to comply with these referents. Research support for the importance of subjective norms in exercise intention has generally been insignificant among older and younger adults.
This paper stresses that unlike attitude, which tends to consistently account for approximately 30% of behavioral intention, social norms are rarely even significant and always account for a very small percentage towards the variance of exercise intentions. Still, social norms tend to have greater impact on less educated members of a community, and further survey research is needed to assess the impact of social norms on the geriatric population. Both the TRA and the extended TPB identify behavioral intention as the central predictor of behavior. In cross-sectional research, significant associations were identified between intention and self-reported regular exercise and pre-contemplation, contemplation and preparation stages of exercise behavior. Further, a 3-year longitudinal follow-up identified intention with significant discriminant ability between individuals who had maintained their exercise stage versus those who had relapsed. However, the same study failed to discriminate those who did not change stages from those who moved to a latter stage.