LOW OR NORMAL BONE MINERAL DENSITY IN FEMALE ELITE TRIATHLETES

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BODY COMPOSITION, NUTRITION, SUPPLEMENTATION ORIGINAL ARTICLES J SPORTS MED PHYS FITNESS 2012;52:489-500

BMD in elite female triathletes is related to isokinetic peak torque without any association to sex hormone concentrations 4

IN C ER O V P A Y R M IG E H DI T C ® A

E. WULFF HELGE 1, A. MELIN 2, M. WAADDEGAARD 3, I.-L. KANSTRUP

M

Aim. Female endurance athletes suffering from low energy availability and reproductive hormonal disorders are at risk of low BMD. Muscle forces acting on bone may have a reverse sitespecific effect. Therefore we wanted to test how BMD in female elite triathletes was associated to isokinetic peak torque (IPT) and reproductive hormone concentrations (RHC). A possible effect of oral contraceptives (OCON’s) is taken into consideration. Methods. Eight female elite triathletes (training 8-24 hrs/wk) and seven sedentary controls, age 21-37 years, participated. Total body and regional BMD (g.cm-2) were measured by DXA. IPT were measured during knee extension, and trunk extension and flexion (Nm). Serum RHC and biochemical bone markers were evaluated. Energy balance was estimated from 7-days training-and weighed food records. Results. Despite a high training volume, BMD in triathletes was not higher than in controls. In triathletes trunk flexion IPT, but not RHC, was a strong predictor of BMD in both total body and femur (0.70