The mediating role of intention and stages of change in physical activity among adults with physical disabilities: an integrative framework

• Published in: Journal of sport & exercise psychology 2007-02, Vol.29 (1), p.21-38
• Main Authors: Kosma, Maria, Ellis, Rebecca, Cardinal, Bradley J, Bauer, Jeremy J, McCubbin, Jeffrey A
• Format: Article
• Language: English
• Subjects: Adult; Disabled Persons; Exercise - psychology; Female; Humans; Intention; Internet; Male; Middle Aged; Prospective Studies; Surveys and Questionnaires; United States
• ISSN: 0895-2779; 1543-2904
• DOI: 10.1123/jsep.29.1.21

The study's purpose was to identify the mediating role of intention and the stages of change (SOC) in physical activity (PA) over a 6-month period using two models (theory of planned behavior [TPB] and TPB/SOC). Participants were 143 adults with physical disabilities (70.68% response rate; M age = 46.03). The TPB constructs, SOC (time 1), and PA (time 2) were assessed using standardized self-report questionnaires. Based on path analyses, attitude had the highest effect on intention and SOC followed by perceived behavioral control within both well-fit models. The variance in PA explained by the first (TPB) and second (TPB/SOC) models was 16% and 28% respectively. In the just identified model of TPB/SOC, the direct effect of SOC on physical activity remained strong (gamma(soc.pa) = .45) and SOC approached full mediation through attitude. Health promotion interventions need to include both intention and behavior elements (SOC) reinforcing increased PA value and barrier elimination.