Mason C, Alfano CM, Smith AW, Wang CY, Neuhouser ML, Duggan C, Bernstein L, Baumgartner KB, Baumgartner RN, Ballard-Barbash R, McTiernan A. Long-term physical activity trends in breast cancer survivors.
Cancer Epidemiol Biomarkers Prev 2013;
22:1153-61. [PMID:
23576689 DOI:
10.1158/1055-9965.epi-13-0141]
[Citation(s) in RCA: 107] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND
Physical activity is associated with reduced mortality and higher quality of life in breast cancer survivors; however, limited data on the prevalence of activity and long-term trends after diagnosis are available.
METHODS
A multiethnic cohort of 631 women (18-64 years) with stage 0 to IIIA breast cancer was followed for 10 years. Recreational aerobic activity (MET-h/wk) was ascertained for the year before diagnosis (baseline), 24 months, 5 years, and 10 years after enrollment. Women were classified according to U.S. physical activity guidelines (≥150 min/wk moderate or ≥75 min/wk vigorous activity). The OR for meeting guidelines at 5 and 10 years according to baseline factors was estimated using logistic regression. The change in MET-h/wk was predicted using linear regression.
RESULTS
Prediagnosis, 34% of women met physical activity guidelines; 34.0%, 39.5%, and 21.4% met guidelines at 24 months, 5 years, and 10 years after enrollment, respectively. Less than 8% of survivors met guidelines at all follow-up periods. Over 10 years, recreational aerobic activity decreased by a mean ± SD of 4.3 ± 16.2 MET-h/wk. Meeting guidelines pre-diagnosis was strongly associated with meeting guidelines at 5 years [OR (95% confidence interval; CI): 2.76 (1.85-4.1)] and 10 years [OR (95% CI): 3.35 (2.13-5.28)]. No other demographic or prognostic factors were significantly associated with the 10-year change in MET-h/wk.
CONCLUSION
The vast majority of early breast cancer survivors do not meet national exercise recommendations 10 years postdiagnosis.
IMPACT
Physical activity levels are low in breast cancer survivors across the 10 years postdiagnosis; nonetheless, the predictors of activity in this population remain poorly understood.
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