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Skeletal Muscle Gender Dimorphism from Proteomics
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Published on: December 14, 2011

Gonadal function in male mountain bikers.

Faruk Yamaner1, Hulusi Atmaca, Taner Bayraktaroglu

  • 1High School of Physical Education and Sport, Hitit University, Corum, Turkey. yamanerf@hotmail.com

Journal of Strength and Conditioning Research
|May 25, 2011
PubMed
Summary

Male mountain bikers exhibit lower bioavailable testosterone (bioT) and calculated free testosterone (cFT) levels compared to non-cyclists. This hormonal alteration in athletes is complex and not solely due to testicular dysfunction.

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Area of Science:

  • Endocrinology
  • Sports Medicine
  • Reproductive Health

Background:

  • Previous research linked mountain biking to testicular issues like injuries and erectile dysfunction.
  • However, gonadal function in male cyclists has not been thoroughly evaluated.
  • This study addresses the gap by assessing hormonal profiles in professional mountain bikers.

Purpose of the Study:

  • To investigate gonadal function in male professional mountain bikers.
  • To compare hormone levels, including testosterone, between mountain bikers and a control group.
  • To explore potential contributing factors like insulin and leptin levels.

Main Methods:

  • Recruited 22 male professional mountain bikers and 30 healthy non-cyclist controls.
  • Measured fasting blood levels of total testosterone (TT), sex-hormone binding globulin (SHBG), luteinizing hormone (LH), follicle-stimulating hormone (FSH), insulin, glucose, and leptin.
  • Calculated bioavailable testosterone (bioT) and calculated free testosterone (cFT).

Main Results:

  • No significant differences in age, body mass index, or basal hormonal levels (TT, SHBG, LH, FSH, insulin, leptin, glucose) between groups.
  • Significantly lower bioavailable testosterone (bioT) and calculated free testosterone (cFT) levels were observed in mountain bikers compared to controls (p ≤ 0.05).
  • Lower testosterone levels in bikers were not correlated with altered LH, FSH, insulin, or leptin concentrations.

Conclusions:

  • Male mountain bikers demonstrate reduced testosterone concentrations compared to non-cyclists.
  • The observed decrease in testosterone is not solely attributable to testicular dysfunction.
  • The complex etiology of lower testosterone in cyclists warrants further investigation into its impact on athlete performance and well-being.