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Associations of objectively assessed physical activity and sedentary time with biomarkers of breast cancer risk in postmenopausal women: findings from NHANES (2003–2006)

  • Epidemiology
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Abstract

Physical activity reduces the risk of postmenopausal breast cancer through multiple inter-related biologic mechanisms; sedentary time may contribute additionally to this risk. We examined cross-sectional associations of objectively assessed physical activity and sedentary time with established biomarkers of breast cancer risk in a population-based sample of postmenopausal women. Accelerometer, anthropometric and laboratory data were available for 1,024 (n = 443 fasting) postmenopausal women in the U.S. National Health and Nutrition Examination Survey 2003–2006. Associations of quartiles of the accelerometer variables (moderate- to vigorous-intensity activity, light-intensity activity and sedentary time per day; average length of active and sedentary bouts) with the continuous biomarkers were assessed using linear regression models. Following adjustment for potential confounders, including sedentary time, moderate- to vigorous-intensity activity had significant (P < 0.05), inverse associations with all biomarker outcomes (body mass index, waist circumference, C-reactive protein, fasting plasma glucose, fasting insulin and homeostasis model assessment of insulin resistance). Light-intensity activity and sedentary time were significantly associated in fully adjusted models with all biomarkers except fasting glucose. Active bout length was associated with a smaller waist circumference and lower C-reactive protein levels, while sedentary bout length was associated with a higher BMI. The associations of objectively assessed moderate- to vigorous-intensity activity with breast cancer biomarkers are consistent with the established beneficial effects of self-reported exercise on breast cancer risk. Our findings further suggest that light-intensity activity may have a protective effect, and that sedentary time may independently contribute to breast cancer risk.

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Acknowledgments

All data used in this study were collected by the National Center for Health Statistics, Centers for Disease Control and Prevention. Lynch is supported by a National Health and Medical Research Council (NHMRC) Public Health Training Fellowship (#586727) and an Alberta Innovates—Health Solutions Fellowship; Friedenreich is supported by a Health Senior Scholar Award from the Alberta Heritage Foundation for Medical Research; Healy is supported by a NHMRC Public Health Training Fellowship (#569861); Vallance is supported by a Population Health Investigator Award from the Alberta Heritage Foundation for Medical Research and a New Investigator Award from the Canadian Institutes of Health Research; Eakin is supported by a NHMRC Senior Research Fellowship (#511001); Owen is supported by a NHMRC Program Grant (#569940), a NHMRC Senior Principal Research Fellowship (#1003960) and by Research Infrastructure funding from Queensland Health.

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Correspondence to Brigid M. Lynch.

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Lynch, B.M., Friedenreich, C.M., Winkler, E.A. et al. Associations of objectively assessed physical activity and sedentary time with biomarkers of breast cancer risk in postmenopausal women: findings from NHANES (2003–2006). Breast Cancer Res Treat 130, 183–194 (2011). https://doi.org/10.1007/s10549-011-1559-2

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