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Plasma testosterone during bicycle ergometer exercise without and after L-dopa pretreatment
Endocrinologia Experimentalis
|March 1, 1982
Summary
This study investigated exercise effects on testosterone levels in men. Prolactin inhibition did not alter the testosterone response to exercise, suggesting prolactin is not involved in regulating testosterone during physical activity.
Area of Science:
- Exercise Physiology
- Endocrinology
- Sports Science
Background:
- Testosterone levels can fluctuate with physical exertion.
- The role of prolactin in modulating testosterone during exercise remains unclear.
Purpose of the Study:
- To measure plasma testosterone during various exercise intensities.
- To investigate if prolactin influences testosterone secretion during exercise.
Main Methods:
- Healthy untrained men performed bicycle ergometer tests (submaximal, prolonged submaximal, maximal).
- Plasma testosterone and prolactin levels were measured.
- Prolactin release was inhibited using oral L-dopa pretreatment.
Main Results:
- Exercise caused a significant, albeit small, increase in plasma testosterone.
- Peak testosterone levels occurred immediately post-exercise or 10 minutes later.
- L-dopa pretreatment did not affect the exercise-induced testosterone response.
Conclusions:
- Prolactin does not appear to play a role in the increase of plasma testosterone observed during physical exercise.
- Testosterone response to exercise is similar across different intensities.