Hormone levels of world class cyclists during the Tour of Spain stage race

Objectives—To evaluate the hormonal response to strenuous endurance exercise performed by elite athletes. Methods—Nine professional cyclists (mean (SD) age 28 (1) years; mean (SD) Vo2max 75.3 (2.3) ml/kg/min) who participated in a three week tour race (Vuelta a España 1999) were selected as subjects...

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Bibliographic Details
Published in:British journal of sports medicine 2001-12, Vol.35 (6), p.424-430
Main Authors: Lucía, A, Díaz, B, Hoyos, J, Fernández, C, Villa, G, Bandrés, F, Chicharro, J L
Format: Article
Language:English
Subjects:
Adult
Athletes
Bicycle racing
Bicycling - physiology
Body Weight
Circadian Rhythm
cortisol
Cyclists
Endocrine system
endurance exercise
Endurance sports
Exercise
Exercise - physiology
Follicle Stimulating Hormone - blood
gonadotrophins
Hormones
Hormones - blood
Humans
Hydrocortisone - blood
Luteinizing Hormone - blood
Male
melatonin
Melatonin - urine
Original
Physical Endurance - physiology
Physiological aspects
Physiology
Sports medicine
Studies
Testosterone
Testosterone - blood
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Summary:Objectives—To evaluate the hormonal response to strenuous endurance exercise performed by elite athletes. Methods—Nine professional cyclists (mean (SD) age 28 (1) years; mean (SD) Vo2max 75.3 (2.3) ml/kg/min) who participated in a three week tour race (Vuelta a España 1999) were selected as subjects. Morning urinary levels of 6-sulphatoxymelatonin (aMT6s) and morning serum levels of testosterone, follicle stimulating (FSH), luteinising hormone (LH), and cortisol were measured in each subject at t0 (before the competition), t1 (end of first week), t2 (end of second week), and t3 (end of third week). Urine samples of aMT6s were also evaluated in the evening at t0, t1, t2, and t3. Results—Mean urinary aMT6s levels had increased significantly (p
ISSN:0306-3674
1473-0480
DOI:10.1136/bjsm.35.6.424