Models of adherence have been proposed to explicate the concept of adherence behavior.20-23 The Medication Adherence Model interprets adherence as purposeful action, patterned behavior, and feedback.20 Purposeful action and feedback describe the cognitive process while patterned behavior is a behavioral process. From this perspective, the term adherence includes the cognitive process to initiate and evaluate prescribed treatment as well as the behavioral process
for establishing and maintaining a pattern of treatment. According to a process-oriented model, perceived selfefficacy,
perceived benefits of exercise, interpersonal support for exercise, and perceived barriers to exercise were significant predictors of exercise adherence.21 In Thailand, Pinprapapan and colleagues 22 found that social support, health beliefs, provider-patient communication and perceived self-efficacy were factors which influenced adherence.