Trial reportBritish journal of sports medicine2001
Hormone levels of world class cyclists during the Tour of Spain stage race.
Trial report in British journal of sports medicine, 2001. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
26 citing papers in PubMed, 114 citations in OpenAlex.
- Diurnal variation in the salivary melatonin responses to exercise: relation to exercise-mediated tachycardia.European journal of applied physiology · 2011Trial
- Effects of carbohydrate supplementation on competitive runners undergoing overload training followed by a session of intermittent exercise.European journal of applied physiology · 2010Trial
- The metabolic signature of excessive endurance exercise-A prospective study in Tour de France cyclists.iScience · 2026Article
- Recent advances in training intensity distribution theory for cyclic endurance sports: theoretical foundations, model comparisons, and periodization characteristics.Frontiers in physiology · 2025Review
- Effects of Melatonin Administration on Physical Performance and Biochemical Responses Following Exhaustive Treadmill Exercise.Current issues in molecular biology · 2024Article
- Measurement of energy availability in highly trained male endurance athletes and examination of its associations with bone health and endocrine function.European journal of nutrition · 2024Article
- Article
- Relationships between training dose and record power outputs in professional road cyclists: insights and threats to validity.Biology of sport · 2023Article
- Effect of Seasonal Variation during Annual Cyclist Training on Somatic Function, White Blood Cells Composition, Immunological System, Selected Hormones and Their Interaction with Irisin.Journal of clinical medicine · 2021Article
- Influence of a Maximal Incremental Test Until Exhaustion on the Urinary Excretion of Steroid Hormones in Trained Cyclists.Journal of human kinetics · 2021Article
- Correlations between Basal Trace Minerals and Hormones in Middle and Long-Distance High-Level Male Runners.International journal of environmental research and public health · 2020Article
- Is vitamin D status reflected by testosterone concentration in elite athletes?Biology of sport · 2020Article
- Functional Overreaching in Endurance Athletes: A Necessity or Cause for Concern?Sports medicine (Auckland, N.Z.) · 2020Review
- Sport, doping and male fertility.Reproductive biology and endocrinology : RB&E · 2018Review
- Low energy availability assessed by a sport-specific questionnaire and clinical interview indicative of bone health, endocrine profile and cycling performance in competitive male cyclists.BMJ open sport & exercise medicine · 2018Article
- Impact of physical activity and exercise on male reproductive potential: a new assessment questionnaire.Revista andaluza de medicina del deporte · 2017Article
- Urine citrate and 6-sulfatoximelatonin excretion during a training season in top kayakers.European journal of applied physiology · 2012Article
- Sex and gender issues in competitive sports: investigation of a historical case leads to a new viewpoint.British journal of sports medicine · 2012Article
- Bone and energy metabolism parameters in professional cyclists during the Giro d'Italia 3-weeks stage race.PloS one · 2012Article
- Urine melatonin and citrate excretion during the elite swimmers' training season.European journal of applied physiology · 2010Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
7 authors at 4 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectivesTo evaluate the hormonal response to strenuous endurance exercise performed by elite athletes.
methodsNine professional cyclists (mean (SD) age 28 (1) years; mean (SD) VO(2)MAX 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 t(0) (before the competition), t(1) (end of first week), t(2) (end of second week), and t(3) (end of third week). Urine samples of aMT6s were also evaluated in the evening at t(0), t(1), t(2), and t(3).
resultsMean urinary aMT6s levels had increased significantly (p<0.01) during the day after each stage (1091 (33) v 683 (68) ng/ml at t(1); 955 (19) v 473 (53) ng/ml at t(2); 647 (61) v 337 (47) ng/ml at t(3)). Both morning and evening aMT6s levels decreased significantly during the study. A similar pattern was observed for morning serum levels of cortisol and testosterone.
conclusionsThe results suggest that the basal activity of the pineal gland, adrenal glands, and testis may be decreased after consecutive days of intense, long term exercise.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.