Congruence and trajectories of device-measured and self-reported physical activity during therapy for early breast cancer.

Purpose: This study examines congruence between self-reported and device-measured physical activity data in women with early breast cancer and compares trajectories under different treatments.

Methods: Women with non-metastatic breast cancer were recruited before primary therapy. In four weeks distributed over six months after treatment start, patients reported time spent on work, transport, chores and sports via diary and wore Garmin vivofit 3 accelerometers to assess steps taken.