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The relationship between physical activity and 2-hydroxyestrone, 16α-hydroxyestrone, and the 2/16 ratio in premenopausal women (United States)

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Abstract

Objectives: Estrogen is metabolized in the body through two mutually exclusive pathways yielding metabolites with different biological activities: the low estrogenic 2-hydroxyestrone (2-OHE1) and the highly estrogenic 16α-hydroxyestrone (16α-OHE1). The ratio of these metabolites (2/16) may be predictive of risk for developing breast cancer. Early evidence has demonstrated that exercise may alter estrogen metabolism to favor the weak estrogen, 2-OHE1. Methods : Seventy-seven eumenorrheic females completed physical activity logs for two weeks prior to providing a luteal phase urine sample. Concentrations of 2-OHE1 and 16α -OHE1 were measured and the 2/16 ratio computed. Hierarchical regression, controlling for age and body mass index (BMI), was used to determine relationships between estrogen metabolites and daily physical activity. Results : Regression analyses indicated significant positive relationships between physical activity and 2-OHE1 and the 2/16 ratio (p < 0.05) that appears to be independent of BMI. 16αOHE1 was not significantly related to physical activity. Conclusion : These results indicate that physical activity may modulate estrogen metabolism to favor the weak estrogen, 2-OHE1, thus producing a higher 2/16 ratio. This alteration in estrogen metabolism may represent one of the mechanisms by which increased physical activity reduces breast cancer risk.

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  1. University of Northern Colorado, Sport and Exercise Science, BNCC Campus Box 6, Greeley, CO, 80639, USA

    Ann T. Bentz & Carole M. Schneider

  2. AMC Cancer Research Center, Denver, Colorado, 80214, USA

    Kim C. Westerlind

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  1. Ann T. Bentz
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Bentz, A.T., Schneider, C.M. & Westerlind, K.C. The relationship between physical activity and 2-hydroxyestrone, 16α-hydroxyestrone, and the 2/16 ratio in premenopausal women (United States). Cancer Causes Control 16, 455–461 (2005). https://doi.org/10.1007/s10552-004-6256-6

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