Physical activity (PA) participation has important health benefits among individuals with disabilities, whereas inactive lifestyles may lead to secondary health conditions (Rimmer & Braddock, 2002). Although national governmental agencies have increased awareness about the high proportion of people with disabilities who lead a mainly inactive lifestyle, few empirically based studies have started to explore PA promotion strategies for this population. Contrary, most of the health promotion studies have concentrated on active individuals without disabilities. According to the Transtheoretical Model (TM), positive PA behavior change can occur within a stage pattern starting from the early (i.e., inactive) stages and moving to the later (i.e., active) stages. Stage movement can be determined by different individually based and environmental factors such as social support (i.e., behavioral process), perceived health benefits (i.e., cognitive processes and decisional balance), and perceptions of confidence (i.e., self-efficacy). Therefore, the purpose of this study was to explore influential factors toward PA change patterns using the constructs of the TM. From a nationwide pool of volunteers, 151 physically inactive adults (females = 77.5%, males = 22.5%, M age = 37.8 years, age range = 19-58 years) qualified to participate in this study and filled out the survey questionnaires. The most dominant disability categories were spinal cord injury (32.5%), cerebral palsy (21.2%), and multiple sclerosis (19.2%) with the majority of the participants being Caucasian (88%). A direct discriminant function analysis identified that the most influential factors toward PA stage pattern were the behavioral processes (r = .86), cognitive processes (r = .70), self-efficacy (r = .55), and decisional balance (r = .54). According to those stage predictors, the most stable PA stages of change were maintenance (75% classification accuracy), precontemplation (60% classification accuracy), contemplation (52.5% classification accuracy), action (33.3% classification accuracy), and preparation (18.8% classification accuracy). These results support the importance of both behavioral and cognitive processes to the early stages of change (Rosen, 2000). The preparation and action stages were the least stable stages in classification accuracy, indicating the need for further examination of the way the stages of change are conceptualized and operationalized in accordance with the other constructs of the TM. Health promotion experts can utilize the dimensions of the TM to facilitate the development and delivery of contemporary and appealing motivational PA programs for people with disabilities who mainly follow an inactive lifestyle. Funded by NIDRR, USDE.Keyword(s): health promotion, physical activity, research