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The effect of exercise and oral contraceptives on total serum calcium, estradiol and luteinizing hormone in moderately trained women
Abstract
The effect of twenty minutes of exercise at approximately 74% maximal aerobic capacity (VO$\sb2{\rm max})$ upon total serum calcium (Ca$\sb{\rm t}),$ 17 B-estradiol (E$\sb2$), and luteinizing hormone (LH) was examined during the luteal phase of the menstrual cycle in thirty moderately trained eumenorrheic women (mean age = 25.0 $\pm$ 0.6 years). Sixteen women served as a control group. Fourteen women were taking oral contraceptives. Blood samples were drawn immediately pre-exercise, post-exercise, and 30 min post-exercise. Concentrations of E$\sb2$ and LH were measured using radioimmunoassays. The concentration of Ca$\sb{\rm t}$ was determined spectrophotometrically. Pre-exercise concentrations of LH were significantly (p $<$ 0.05) higher in control subjects compared to subjects taking oral contraceptives. The concentration of E$\sb2$ was significantly (p $<$ 0.01) increased immediately following exercise in control subjects taking oral contraceptives. The mean concentration of E$\sb2$ returned to the pre-exercise concentration within 30 min following exercise in the control subjects. The mean concentration of Ca$\sb{\rm t}$ was increased slightly (p $>$ 0.05) immediately following exercise in subjects of both groups. A slight hemoconcentration of approximately 2% occurred during exercise which explains the changes in Ca$\sb{\rm t}$. No significant changes (p $>$ 0.05) were detected in the mean concentration of LH following exercise in subjects of either group. Across the three sampling times, mean concentrations of E$\sb2$ and LH were significantly higher (p $<$ 0.05) in control subjects. These results suggest that steady-state exercise at approximately 74% VO$\sb2$max elicits an increase in the concentration of E$\sb2$ in moderately trained eumenorrheic women while use of oral contraceptives prevents exercise-induced increases in E$\sb2$. However, steady-state submaximal exercise or oral contraceptives do not appear to change the secretion of LH during or subsequent to the exercise bout.
Subject Area
Anatomy & physiology|Animals
Recommended Citation
Nutter, June, "The effect of exercise and oral contraceptives on total serum calcium, estradiol and luteinizing hormone in moderately trained women" (1987). ETD collection for University of Nebraska-Lincoln. AAI8803764.
https://digitalcommons.unl.edu/dissertations/AAI8803764