GH responses to a near-maximal exercise training session on the-field in cyclists
| Autor: | Lafortuna C.L., Marinone P.G., Ottolini S., Sartorio A. |
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| Rok vydání: | 2003 |
| Zdroj: | Journal of endocrinological investigation (Testo stamp.) 26 (2003): 12–14. info:cnr-pdr/source/autori:Lafortuna C.L., Marinone P.G., Ottolini S., Sartorio A./titolo:GH responses to a near-maximal exercise training session on the-field in cyclists/doi:/rivista:Journal of endocrinological investigation (Testo stamp.)/anno:2003/pagina_da:12/pagina_a:14/intervallo_pagine:12–14/volume:26 |
| Popis: | Acute plasma GH response to prolonged (1 h) near-maximal exercise was studied in 7 elite cyclists (6 males, 1 female; mean age +/- SE: 24.9 +/- 1.4 yr) during a routine training session on an uphill track (length: 22.0 km, average slope: 4.39%) and during a recovery (REC) period of 60 min from the end of exercise. The training session entailed a warming-up (WARM) phase of about 20 min at 63% of individual maximal heart rate (HRmax) followed by a high intensity exercise (HIE) phase of about 60 min at 90-92% of HRmax. GH resting values averaged 0.2 +/- 0.06 ng/ml; average GH concentration attained a maximal value (21.5 +/- 3.3 ng/ml, range: 11.0-38.2 ng/ml) between 20 and 40 min of HIE and significantly decreased thereafter (p=0.01), although exercise intensity was unchanged in the following period (p=0.14). After WARM, GH concentrations were significantly lower than peak values (p=0.05). During REC, GH levels steadily decreased, attaining a value of 2.6 +/- 0.8 ng/ml 60 min after the end of exercise. It was concluded that during prolonged and sustained exercise on-the-field in cyclists, GH value determined at the end of the bout may not correspond to the maximal value, which can be observed after 20 to 40 min of near-maximal exercise. |
| Databáze: | OpenAIRE |
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