Effect of a 3-Month Endurance Training Program on Metabolic and Multiple Hormonal Responses to Exercise

Abstract We have investigated the effect of a 3-month endurance training program (running and cycling) on plasma hormone responses during standardized bicycle ergometer work (15-min consecutive work loads of 60%, 70%, 80%, and eventually 90% V̇O 2 max) in eight previously untrained eumenorrheic wome...

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Bibliographic Details
Published in:International journal of sports medicine 1987-12, Vol.8 (S 3), p.S154-S160
Main Authors: Keizer, H. A., Kuipers, H., de Haan, J., Janssen, G. M. E., Beckers, E., Habets, L., van Kranenburg, G., Geurten, P.
Format: Article
Language:English
Subjects:
Adrenal Cortex Hormones - blood
Adult
Chapter 4
Female
Follicular Phase
Gonadal Steroid Hormones - blood
Humans
Lactates - blood
Lactic Acid
Luteal Phase
Physical Education and Training
Physical Endurance
Physical Exertion
Pituitary Hormones, Anterior - blood
Time Factors
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Summary:Abstract We have investigated the effect of a 3-month endurance training program (running and cycling) on plasma hormone responses during standardized bicycle ergometer work (15-min consecutive work loads of 60%, 70%, 80%, and eventually 90% V̇O 2 max) in eight previously untrained eumenorrheic women. The subjects were investigated before and after training both in the follicular and luteal phases of the menstrual cycle (between the 7th-10th and 20th-25th days of their menstrual cycle, respectively). Blood was obtained 15 and 2 min before the onset of exercise and at the end of each work load from an indwelling catheter. In each sample, the plasma concentrations of estradiol 17β (E 2 ), progesterone (P), testosterone (T), androstenedione (Δ4-A), dehydroepiandrosterone sulfate (DHEA-S), prolactin (PRL), and adrenocorticotropic hormone (ACTH) were assayed in duplicate by RIA; lactate was assayed as well. The hormone concentrations were expressed in absolute as well as in relative values. After training basal DHEA-S and ACTH levels were significantly (P < 0.05) lower in both phases of the menstrual cycle, whereas basal luteal phase E 2 and T levels were significantly (0.05 > P > 0.01) lower after training. Exercise induced significant increments in the relative values of ail hormones in both phases (0.05 > P > 0.001). After training, T and DHEA-S increased relatively more pronounced (0.05 > P > 0.02) in the follicular and luteal phase, respectively.
ISSN:0172-4622
1439-3964
DOI:10.1055/s-2008-1025722