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Steroid use and human performance: Lessons for integrative biologists.

Jerry F Husak1, Duncan J Irschick

  • 1Department of Biological Sciences, Virginia Tech, Blacksburg, VA 24061, USA. Jerry.Husak@usd.edu

Integrative and Comparative Biology
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Hormone studies show steroids boost muscle mass and power in humans, but their effects on endurance remain unclear. More research is needed to understand hormone impacts on animal performance.

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Area of Science:

  • Integrative biology
  • Endocrinology
  • Exercise physiology

Background:

  • Research on hormone-mediated animal performance lags behind human studies.
  • Human steroid use increases muscle mass and power through protein synthesis and hypertrophy.
  • Steroid effects on human endurance, fatigability, and recovery are not well-established.

Purpose of the Study:

  • To review current understanding of hormone effects on performance.
  • To identify research gaps in comparative endocrinology and performance.
  • To provide recommendations for future research on hormones and performance.

Main Methods:

  • Literature review of human and animal studies on steroid use and performance.
  • Analysis of biochemical and cellular mechanisms of steroid action on muscle.
  • Comparative analysis of findings across different taxa and body regions.

Main Results:

  • Steroids enhance muscle morphology and burst performance in humans, consistent with animal models.
  • Discrepancies exist between human and animal data, possibly due to limited comparative research.
  • No clear evidence shows steroids improve human endurance, fatigability, or recovery.

Conclusions:

  • Further research is crucial to understand the fundamental relationships between hormones, morphology, and performance.
  • Future studies should consider training, timing, and dosage when investigating hormone regulation of performance.
  • Long-term effects of hormone manipulation on fitness require more investigation.