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|Title: ||Factors affecting bone loss in female endurance athletes - A two-year follow-up study|
|Authors: ||Braam, L.A.J.L.M.|
|Issue Date: ||2003|
|Publisher: ||AMER ORTHOPAEDIC SOC SPORT MED|
|Citation: ||American journal of sports medicine, 31(6). p. 889-895|
|Abstract: ||Background: Low bone mass leading to stress fractures is a well-known and yet unsolved problem among female athletes.
Purpose: To quantify the rate of bone loss in healthy female athletes and investigate the effects of estrogen and vitamin K supplementation on bone loss.
Study Design: Prospective cohort study.
Methods: We classified 115 female endurance athletes into amenorrheic, eumenorrheic, or estrogen-supplemented groups and randomized them to receive either placebo or vitamin K-1. The bone mineral densities of the subjects' femoral neck and lumbar spine were measured at baseline and after 2 years.
Results: Bone mineral density in the lumbar spine remained constant, but bone density in the femoral neck had decreased significantly after 2 years in all three subgroups. The decrease was higher in amenorrheic (-6.5% +/- 4.0%) than in eumenorrheic (-3.2% +/- 4.1%) and estrogen-supplemented athletes (-3.9% +/- 3.1%). Supplementation with vitamin K did not affect the rate of bone loss.
Conclusions: The rate of bone loss in all three subgroups of female athletes was unexpectedly high; neither estrogen nor vitamin K supplementation prevented bone loss.
Clinical Relevance: High-intensity training maintained over several years must be regarded in women as a risk factor for osteoporosis, and protocols for optimal treatment should be developed. (C) 2003 American Orthopaedic Society for Sports Medicine.|
|ISI #: ||000186640600011|
|Type: ||Journal Contribution|
|Validation: ||ecoom, 2004|
|Appears in Collections: ||Research publications|
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