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Biochemical and hormonal changes during a 1000 km ultramarathon
R G Pestell1, D M Hurley, R Vandongen
1Royal Perth Hospital, Western Australia.
Summary
Highly trained athletes exhibit unique hormonal profiles during extreme endurance events. Ultramarathon running significantly elevates catecholamines and cortisol, suggesting hormonal adaptation to prolonged physical stress.
Area of Science:
- Endocrinology
- Sports Medicine
- Exercise Physiology
Background:
- Endurance athletes often display distinct physiological characteristics.
- Understanding hormonal responses to extreme physical stress is crucial for sports science.
Purpose of the Study:
- To investigate the hormonal responses of highly trained athletes to an ultramarathon.
- To compare hormonal profiles before and after extreme physical exertion.
Main Methods:
- Blood samples collected from eight elite athletes before and after the 1986 Sydney to Melbourne Ultramarathon.
- Analysis of serum concentrations for catecholamines (epinephrine, norepinephrine, dopamine), ACTH, beta-endorphin, GH, PRL, cortisol, and CBG.
Main Results:
- Baseline elevated serum conjugated catecholamines and ACTH in athletes.
- Ultramarathon completion further increased norepinephrine levels.
- Significant increases in growth hormone, prolactin, and cortisol post-race.
Conclusions:
- Ultramarathon runners present an altered hormonal baseline, particularly in catecholamines and the HPA axis.
- These hormonal changes may represent adaptive mechanisms to chronic physical stress.
- The hormonal response to severe exercise differs from that observed in untrained individuals.
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