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Low testosterone: Androgen deficiency, endurance exercise training, and competitive performance.

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|December 19, 2019
PubMed
Summary

Intensive endurance training significantly lowered resting testosterone (T) and T:C ratio in males, with about 50% meeting androgen deficiency (AD) criteria. Decreased T or T:C ratio does not always impair performance.

Keywords:
adaptationcatabolichormoneshypogonadismmalesovertrainingstress

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Area of Science:

  • Endocrinology
  • Sports Science
  • Exercise Physiology

Background:

  • Intensive endurance training impacts male hormonal profiles.
  • Understanding the relationship between training load, testosterone, and cortisol is crucial for athlete health and performance.
  • Androgen deficiency (AD) has significant health implications.

Purpose of the Study:

  • To track weekly changes in resting testosterone (T), cortisol (C), and the T:C ratio during intense endurance training.
  • To determine if male athletes meet clinical criteria for androgen deficiency (AD) based on T levels during training.

Main Methods:

  • An 18-week endurance training program with progressive increases in training volume.
  • Weekly assessment of blood testosterone (T) and cortisol (C) levels.
  • Evaluation of competitive running performance and T:C ratio at regular intervals.

Main Results:

  • Running performance improved significantly throughout the training period.
  • Testosterone (T) levels decreased significantly from baseline, with the greatest reduction observed at week 13.
  • The T:C ratio also significantly decreased, particularly at week 13, while cortisol (C) levels showed high variability without significant changes.
  • Approximately 50% of participants met the criteria for androgen deficiency (AD).

Conclusions:

  • Decreases in testosterone or the T:C ratio during intense training do not necessarily indicate compromised athletic performance.
  • Clinicians and sports scientists should be aware that high training loads can induce androgen deficiency (AD) in male athletes.