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Changes in objectively measured physical activity and sedentary behaviour among breast cancer survivors undergoing treatment

Forbes, Cynthia

Authors

Abstract

Purpose: Activity behaviors of breast cancer survivors (BCSs) during treatment are unlikely to be at levels sufficient enough to gain health benefits. Previous activity research among BCSs has been mainly posttreatment and generally cross-sectional. This study aimed to determine the prevalence and changes in objectively measured moderate-to-vigorous physical activity (MVPA), light physical activity (LPA), and sedentary behavior (SED) among BCSs undergoing adjuvant/palliative therapy.

Methods: Participants completed baseline surveys and wore accelerometers to measure activity during waking hours during treatment and again 6 months later. Hierarchal linear modeling (HLM) was used to determine changes.

Results: In total, 77 BCSs participated. Ninety-one percent provided physical activity (PA) data for 3 or more valid days at baseline (T1) and 72% at 6 months (T2); 29% met PA guidelines at T1 and 41% at T2. Daily LPA and SED did not change from T1 to T2 (133 vs 138 minutes; 595 vs 597 minutes). Controlling for body mass index at the intercept, HLM revealed that MVPA significantly increased from T1 to T2 (+5.62; P = .015).

Conclusion: An increase in objectively measured total daily MVPA over 6 months was found, at which time, fewer BCSs were currently receiving chemo- or radiotherapy and may theoretically be feeling better. However, fewer T2 measures may bias and artificially inflate the results. Although total MVPA minutes increased at T2, less than half BCSs were meeting guidelines and had high amounts of LPA/SED during treatment, with insignificant change over time (71% at T1; 59% at T2). Practitioner intervention may help reduce SED while increasing LPA and MVPA behavior among those currently undergoing treatment.

Journal Article Type Article
Publication Date 2018-10
Print ISSN 2168-3808
Publisher American Physical Therapy Association
Peer Reviewed Peer Reviewed
Volume 36
Issue 4
Pages 198–205
Institution Citation Forbes, C. (2018). Changes in objectively measured physical activity and sedentary behaviour among breast cancer survivors undergoing treatment. Rehabilitation Oncology, 36(4), 198–205. https://doi.org/10.1097/01.REO.0000000000000137
DOI https://doi.org/10.1097/01.REO.0000000000000137
Publisher URL https://journals.lww.com/rehabonc/Abstract/2018/10000/Changes_in_Objectively_Measured_Activity_Behavior.5.aspx