Optimizing a mHealth Physical Activity Intervention With Mindful Awareness Lessons in Breast Cancer Survivors

The primary purpose of the present study is to apply MOST methodology to determine which types of social support and mindfulness training intervention components optimally increase MVPA adoption and maintenance in Breast Cancer Survivors (BCS) in a 24-week intervention with a 48-week follow-up. The researchers will also examine the effects of changes in MVPA on symptom burden, time spent in intensities of other activities (i.e. light and sedentary), and sleep quality and duration. Aim 1: To identify which components from four mHealth components under consideration for inclusion meaningfully contribute to improvements in MVPA at 24 and 48 weeks. Aim 2: To examine how changes in MVPA, as a result of the 4 components, may influence additional health behaviors and outcomes including: a) symptom burden (i.e. fatigue, depression, anxiety); b) time spent i n other activity intensities (i.e. light, sedentary time); and c) sleep duration and quality. Aim 3: To examine potential mediators (i.e. adherence, psychosocial factors such as post-traumatic growth, self-compassion, self-efficacy, and goal-setting) and moderators (i.e., age, time since diagnosis) of the four intervention components on MVPA.