Isoflavone supplementation reduced serum sex hormone-binding globulin concentration in postmenopausal women
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Abstract
The bone loss that occurs with ageng in postmenopausal women is related to a decrease in serum levels of bioavailable estrogen and testosterone, which are mainly bound to sex hormone-binding globulin (SHBG) and albumin. Phytoestrogens are thought to exert hormonal effects in the body due to their structural resemblance to 17â-estradiol. The objective of this study was to evaluate the effect of isoflavone supplementation on levels of SHBG in postmenopausal women aged 47- 60 years.
Methods
A study of pre and post test design with controls was conducted in 70 women aged 47- 60 years. Subjects were randomly divided into 2 groups, the isoflavone group received 100 mg isoflavones/day + calcium 500 mg/day and the control group calcium 500 mg/day for 6 months. Measurement of bone mineral density was performed prior to supplementation, and serum SHBG levels before and after supplementation.
Results
Supplementation of isoflavones for 6 months reduced the SHBG levels by 31.1% in the isoflavone group (p=0.000), whereas supplementation of calcium for 6 months did not affect the levels of SHBG in the control group (p=0.359). Supplementation of isoflavones for 6 months reduced SHBG levels of postmenopausal women in the isoflavone group with either osteopenia (p=0.028) or osteoporosis (p=0.008).
Conclusion
Supplementation of isoflavones for 6 months decreased the SHBG levels of postmenopausal women in the isoflavone group with osteopenia and osteoporosis. Our findings suggest that phytoestrogens may significantly decreased SHBG levels in postmenopausal women.
Article Details
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References
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