Thyroid hormone levels during a 3-week professional road cycling competition
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López Chicharro, José
Hoyos, J.
Bandrés Moya, Fernando
Terrados Cepeda, Nicolás
Fernández, Benjamín
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Abstract
The aim of this investigation was to examine the thyroid hormone levels of professional cyclists during a 3-week stage competition (Vuelta a España 1998). The study population was made up of 16 male cyclists from two world-leading professional teams. Four blood samples were drawn (between 07:00 and 09:00 a.m.) from each participant before and at the end of the 1st, 2nd and 3rd weeks of competition. 3,5,3′ (-Triiodothyronine (T3), free T3 (FT3), thyroxine (T4), free T4 (FT4) and thyroid-stimulating hormone (TSH) were determined in each blood sample by radioimmunoassay. Serum T4, FT4 and FT3 levels showed a significant increase (p<0.05) by the last week of competition while concentrations of TSH and T3 remained unchanged. In conclusion, 3 weeks of competition provokes changes in basal thyroid hormone concentrations in professional road cyclists.
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López Chicharro, J., Hoyos, J., Bandrés, F., Terrados Cepeda, N., Fernández, B., & Lucía Mulas, A. (2001). Thyroid hormone levels during a 3-week professional road cycling competition. Hormone Research, 56(5-6), 159-164.