Stress-associated testosterone suppression: central adaptation or hypogonadism?

Area of Science:

• Endocrinology
• Sports Medicine
• Physiology

Background:

• Low circulating testosterone is often misdiagnosed as hypogonadism in stressed populations.
• Previous research has not fully distinguished between central suppression and intrinsic testicular dysfunction.

Purpose of the Study:

• To investigate the mechanisms behind testosterone suppression in physically stressed individuals.
• To differentiate adaptive androgen suppression from pathological hypogonadism.

Main Methods:

• Analysis of data from military field studies, endurance athletes, and competitive stress models.
• Human chorionic gonadotropin stimulation tests to assess Leydig cell responsiveness.
• Evaluation of the impact of energy availability and stress on hormonal profiles.

Main Results:

• Testosterone suppression during sustained stress is primarily a centrally mediated, reversible adaptation.
• Severe energy deficit, sleep disruption, and psychogenic stress suppress hypothalamic-pituitary-gonadal axis function.
• Resistance training in energy-sufficient men does not suppress testosterone, highlighting energy availability as key.
• Acute competitive stress causes rapid, central testosterone modulation.
• Leydig cell responsiveness is preserved, confirming hypothalamic-pituitary inhibition.

Conclusions:

• Androgen suppression in stressed populations is an adaptive endocrine response to energetic and psychological constraints.
• This adaptive phenotype is distinct from pathological hypogonadism and is reversible upon recovery.
• Clinical evaluation should differentiate functional central suppression from intrinsic gonadal failure.