Exercise barrier and task self-efficacy in breast cancer patients during treatment

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Abstract
Understanding exercise self-efficacy in breast cancer patients during treatment is important for enhancing physical activity adherence. Therefore, the primary study purpose was to determine, among breast cancer patients during treatment, the psychometric properties of scales to measure exercise barrier and task self-efficacy. The study also aimed to determine the following: (1) level of self-efficacy, (2) associations between barrier and task self-efficacy, and (3) associations between self-efficacy and patient age, race, and treatment type. Eighty-six female breast cancer patients recruited from a medical oncologist’s office completed the scales once, and 46 repeated the scales 2 weeks later. The majority were Caucasian (95%), with 26% receiving chemotherapy, 64% hormonal therapy alone, and 5% radiation/other. The mean age was 59±14 years. The Cronbach’s alpha for the nine-item barrier self-efficacy scale was 0.96, with a test–retest correlation of 0.89 (ppr=−0.36, p=0.001). Both self-efficacy scales demonstrated good internal consistency and test–retest reliability. Self-efficacy may be a useful target for physical activity interventions among breast cancer patients during treatment.