Abstract
Background
Exercise generally improves quality of life (QoL) and psychosocial functioning in adult populations but few randomized trials have examined dose-response effects.
Purpose
The purpose of the present study was to report the QoL and psychosocial outcomes from the Breast Cancer and Exercise Trial in Alberta (BETA).
Methods
Healthy but inactive postmenopausal women at risk for breast cancer were randomized to a year-long aerobic exercise intervention consisting of either 150 min/week (moderate volume group, n = 200) or 300 min/week (high volume group, n = 200). QoL was assessed at baseline and 1 year using the short form-36 health survey. Sleep quality, depression, anxiety, stress, self-esteem, and happiness were also assessed. Participant preference for group assignment (i.e., exercise volume) was assessed at baseline and tested as a moderator.
Results
There were no statistically significant dose-response effects of aerobic exercise on any QoL, sleep quality, or psychosocial outcome. Participant preference for group assignment did not moderate any QoL, sleep quality, or psychosocial responses. Marital status was a significant moderator (p for interaction = 0.01) and obesity showed a trend towards being a moderator (p for interaction = 0.08) of the dose-response effects of aerobic exercise on global sleep quality such that unmarried and obese women improved sleep quality with the higher volume of aerobic exercise.
Conclusions
A higher volume of aerobic exercise, approximately double the minimum public health guideline, did not provide additional QoL or psychosocial benefits compared to the minimum public health guideline in inactive postmenopausal women, even for women who preferred the higher volume of exercise at baseline.
Trial Registration
Trial Registration clinicaltrials.gov identifier: NCT1435005.
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Authors’ Contributions
Drs. Courneya and Friedenreich had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Courneya, Friedenreich. Acquisition, analysis, or interpretation of data: All authors. Drafting of the manuscript: Courneya, McNeil, O’Reilly, Morielli. Critical revision of the manuscript for important intellectual content: All authors. Statistical analysis: O’Reilly. Obtained funding: Courneya, Friedenreich. Administrative, technical, or material support: Courneya, Friedenreich. Study supervision: Courneya, Friedenreich.
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Funding
This research was funded by the Alberta Cancer Foundation (#24404). Dr. Courneya is supported by the Canada Research Chairs Program. Dr. Friedenreich holds a Health Senior Scholar Award from Alberta Innovates-Health Solutions and the Alberta Cancer Foundation Weekend to End Women’s Cancers Breast Cancer Chair. The funding body had no role in the design of the study; the collection, analysis, or interpretation of data; or in writing the manuscript.
Author’ Statement of Conflict of Interest and Adherence to Ethical Standards
Authors Courneya, McNeil, O’Reilly, Morielli, and Friedenreich declare that they have no conflict of interest. All procedures, including the informed consent process, were conducted in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000.
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Courneya, K.S., McNeil, J., O’Reilly, R. et al. Dose-Response Effects of Aerobic Exercise on Quality of Life in Postmenopausal Women: Results from the Breast Cancer and Exercise Trial in Alberta (BETA). ann. behav. med. 51, 356–364 (2017). https://doi.org/10.1007/s12160-016-9859-8
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DOI: https://doi.org/10.1007/s12160-016-9859-8