Testosterone, cortisol, and creatine kinase levels in male distance runners during reduced training
Deutscher übersetzter Titel: | Testosteron-, Kortisol- und Kreatinkinasekonzentrationen bei Langstreckenlaeufern unter vermindertem Trainingspensum |
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Autor: | Houmard, J.A.; Costill, D.L.; Mitchell, J.B.; Park, So-hyun; Fink, W.J.; Burns, J.M. |
Erschienen in: | International journal of sports medicine |
Veröffentlicht: | 11 (1990), 1, S. 41-45, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource Elektronische Ressource (online) |
Sprache: | Englisch |
ISSN: | 0172-4622, 1439-3964 |
DOI: | 10.1055/s-2007-1024760 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199005043465 |
Quelle: | BISp |
Abstract
The purpose of this study was to examine if reduced training would reestablish normal testosterone, cortisol, and creatine kinase (CK) levels in male distance runners. Ten male runners ((mean +/- SE) age 32.0 +/- 2.5 yrs, body fat 9.6 +/- 1.0, VO2max 61.8 +/- 1.1 ml/kg/min) were monitored during 4 weeks of normal training (baseline training, BT) and 3 weeks of reduced training (RT). During BT running distance averaged 81 +/- 5 km/week, 6 days/week. During RT the runners reduced weekly training volume by 70 of BT to 24 +/- 2 km/week and training frequency to 5 days/week. Weekly resting blood samples were obtained between 0600-0900 hrs after an overnight fast. During BT resting total testosterone levels averaged 5.10 +/- 0.21 ng/ml, which is within the low ranges previously reported in male distance runners. Testosterone levels were not affected by RT (avg of 5.38 +/- 0.31 ng/ml). Cortisol levels were in the high range of normal during BT (23.61 +/- 1.18 ug/dl) and were not altered with RT (avg of 23.14 +/- 1.56 ug/dl). Creatine kinase was elevated (168 +/- 15 U/L) during BT and was significantly reduced at weeks 1-3 of RT (avg of 99 +/- U/L). These results suggest that normally training male runners have low resting total testosterone levels and cortisol levels in the high-normal range. Resting testosterone and cortisol were not responsive to the training reduction. Creatine kinase appears to be sensitive to relative changes in training. Verf.-Referat