Project BIPAMS: Behavioral Intervention for Physical Activity in Multiple Sclerosis

This randomized controlled trial will examine the effect of a 6-month behavioral intervention, based on social cognitive theory and delivered through the Internet, for increasing physical activity and secondarily improving mobility, cognition, symptoms and quality of life in persons with MS. The investigators hypothesize that individuals who receive the 6-month behavioral intervention will demonstrate an increase in physical activity behavior that will last throughout a 6-month follow up compared with participants in the control condition. The investigators further hypothesize that individuals in the behavioral intervention will demonstrate better walking mobility and cognitive function, reduced fatigue, depression, anxiety, and pain, and improved quality of life compared to the control condition. The investigators hypothesize that the behavioral intervention will increase physical activity through positive changes in self-efficacy, outcome expectations, goal setting, and impediments as social-cognitive determinants.