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The acute testosterone, growth hormone, cortisol and interleukin-6 response to 164-km road cycling in a hot environment.
Vingren, Jakob L; Budnar, Ronald G; McKenzie, Amy L; Duplanty, Anthony A; Luk, Hui-Ying; Levitt, Danielle E; Armstrong, Lawrence E.
Afiliación
  • Vingren JL; a Applied Physiology Laboratory, Department of Kinesiology, Health Promotion and Recreation , University of North Texas , Denton , TX 76203 , USA.
  • Budnar RG; b Department of Biological Sciences , University of North Texas , Denton , TX 76203 , USA.
  • McKenzie AL; a Applied Physiology Laboratory, Department of Kinesiology, Health Promotion and Recreation , University of North Texas , Denton , TX 76203 , USA.
  • Duplanty AA; b Department of Biological Sciences , University of North Texas , Denton , TX 76203 , USA.
  • Luk HY; c Department of Kinesiology , University of Connecticut , Storrs , CT 06269 , USA.
  • Levitt DE; a Applied Physiology Laboratory, Department of Kinesiology, Health Promotion and Recreation , University of North Texas , Denton , TX 76203 , USA.
  • Armstrong LE; b Department of Biological Sciences , University of North Texas , Denton , TX 76203 , USA.
J Sports Sci ; 34(8): 694-9, 2016.
Article en En | MEDLINE | ID: mdl-26199143
This study investigated the acute endocrine responses to a 164-km road cycling event in a hot environment. Thirty-four male experienced cyclists (49.1 ± 8.3 years, 86.8 ± 12.5 kg, 178.1 ± 5.1 cm) participating in a 164-km road cycling event were recruited. Blood samples were collected within 0.3-2.0 h before the start (PRE: ~0500-0700 h) and immediately following the ride (POST). Samples were analysed for testosterone, growth hormone (GH), cortisol and interleukin-6 (IL-6). The temperature and humidity during the event were 35.3 ± 4.9°C and 47.2 ± 14.0%, respectively. Based on the finishing time, results for the fastest (FAST, 305 ± 10 min) and the slowest (SLOW, 467 ± 31 min) quartiles were compared. At POST, testosterone concentration was significantly (P < 0.05) lower (PRE, 20.8 ± 8.6; POST, 18.2 ± 6.7 nmol · L(-1)), while GH (PRE, 0.3 ± 0.1; POST, 2.3 ± 0.3 µg · L(-1)), cortisol (PRE, 661 ± 165; POST, 1073 ± 260 nmol · L(-1)) and IL-6 (PRE, 4.0 ± 3.4; POST, 22.4 ± 15.2 pg · mL(-1)) concentrations were significantly higher than those at PRE. At POST, GH and cortisol were significantly higher for the FAST group than for the SLOW group (GH, 3.6 ± 2.0 and 1.0 ± 0.8 µg · L(-1); cortisol, 1187 ± 209 and 867 ± 215 nmol · L(-1)). Participation in an ultra-endurance road cycling event in a hot environment induced significant acute changes in concentrations of circulating hormones, with a greater augmentation of GH and cortisol in those completing the ride fastest.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Testosterona / Ciclismo / Hidrocortisona / Interleucina-6 / Hormona de Crecimiento Humana / Calor Límite: Adult / Humans / Male / Middle aged Idioma: En Revista: J Sports Sci Año: 2016 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Testosterona / Ciclismo / Hidrocortisona / Interleucina-6 / Hormona de Crecimiento Humana / Calor Límite: Adult / Humans / Male / Middle aged Idioma: En Revista: J Sports Sci Año: 2016 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido