Adrenal medulla responsiveness to the sympathetic nervous activity in sprinters and untrained subjects during a supramaximal exercise
Deutscher übersetzter Titel: | Reaktionsbereitschaft des Nebennierenmarks auf den Sympathikotonus von Sprintern und Untrainierten unter supramaximaler Belastung |
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Autor: | Zouhal, H.; Rannou, F.; Gratas-Delamarche, A.; Monnier, M.; Bentue-Ferrer, D.; Delamarche, P. |
Erschienen in: | International journal of sports medicine |
Veröffentlicht: | 19 (1998), 3, S. 172-176, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource Elektronische Ressource (online) |
Sprache: | Englisch |
ISSN: | 0172-4622, 1439-3964 |
DOI: | 10.1055/s-2007-971899 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199805301896 |
Quelle: | BISp |
Abstract des Autors
The purpose of this study was to compare the adrenal medullar responsiveness to the sympathetic nervous activity between sprinters and untrained subjects after a supramaximal exercise (Wingate-test). Thirteen subjects took part in this study: 7 male athletes (20.3+/-1.8 years) competing in sprint running (S) and 6 untrained men (UT) (21+/-1.3 years). They performed an incremental treadmill test to determine the maximal oxygen uptake (VO2max), a force-velocity test and a Wingate-test on 3 different days, separated by a maximal interval of 15 days. The maximal power (Wmax) and the mean power (W) were determined from the Wingate-test on a cycle ergometer. Plasma lactate, adrenaline and noradrenaline concentrations were determined at rest (La0, A0, NA0), immediately after the Wingate-test (Amax, NAmax) and after-5 minutes recovery (Lamax, A5 and NA5). S exhibited higher performances than UT during the Wingate-test as shown by their significantly higher values of Wmax (1111+/-38 W in S vs 886+/-148 W in UT), W (822+/-37 W in S vs 646+/-69 W in UT) and Lamax (16.8+/-1.8 mmol/l in S vs 12.2+/-2.5 mmol/l in UT). At the end of the test the NAmax values were similar in both groups whereas the Amax were significantly higher in S (7.6+/-1.4 nmol/l in S vs 3.6+/-3.2 nmol/l in UT). This leads to a higher Amax/NAmax ratio for sprinters compared to untrained subjects (0.7+/-0.2 in S vs 0.3+/-0.2 in UT, p<0.05). As the disappearance of A (estimated by the Amax-A5 difference) was not lower in S (6.4+/-1.5 nmol/l in S vs 1.8+/-4 nmol/l in UT), the higher Amax values in S might be explained by a greater secretion level of A. Conversely the identical NAmax values in both groups suggested that this kind of exercise induced the same sympathetic input in S and UT. Consequently the higher Amax/NAmax ratio in S argued in favor of a higher responsiveness of the adrenal medulla of sprinters to the same sympathetic input. Verf.-Referat