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Related Experiment Video

Updated: Jun 16, 2026

Combining Behavioral Endocrinology and Experimental Economics: Testosterone and Social Decision Making

Combining Behavioral Endocrinology and Experimental Economics: Testosterone and Social Decision Making

Published on: March 2, 2011

Short term testosterone replacement therapy improves libido and body composition.

Edésio Seara de Andrade¹, Ruth Clapauch, Salo Buksman

¹Divisão de Endocrinologia Feminina e Andrologia, Setor de Endocrinologia, Hospital da Lagoa, Rio de Janeiro, RJ, Brasil. junioredesio@hotmail.com

Arquivos Brasileiros De Endocrinologia E Metabologia

|February 4, 2010

Summary

Testosterone replacement therapy in men with late-onset hypogonadism improved sexual function and body composition. The treatment demonstrated safety for prostate and blood health over six months.

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Area of Science:

Endocrinology
Men's Health
Andrology

Background:

Late-onset hypogonadism (LOH) affects a significant number of aging males.
LOH is associated with decreased quality of life, sexual dysfunction, and metabolic changes.
Testosterone replacement therapy (TRT) is a potential treatment for LOH.

Purpose of the Study:

To evaluate the efficacy and safety of TRT in men with LOH.
To compare TRT outcomes against hypogonadal men not receiving replacement and healthy controls.
To assess changes over a six-month period.

Main Methods:

A six-month study involving 62 participants divided into three groups.
Group 1 (HR): Hypogonadal males receiving intramuscular testosterone every three weeks.
Groups 2 (HV) & 3 (CV): Hypogonadal and control males receiving daily oral vitamins, respectively.
Assessments included ADAM, AMS, IIEF-5, SF-36 questionnaires, and clinical/laboratory examinations.

Main Results:

The TRT group (HR) showed significant improvement in libido (ADAM 1, p=0.004).
Borderline improvement in sexual potency (IIEF-5, p=0.053) and a decrease in waist circumference (p=0.018) were observed in the HR group.
Prostate-Specific Antigen (PSA) and hematocrit levels remained stable in the TRT group, indicating safety.

Conclusions:

Six months of TRT effectively improved sexual function in men with LOH.
TRT positively impacted body composition, specifically reducing waist circumference.
The study confirmed the safety of TRT regarding prostate and hematological parameters.