Elevated daytime urinary excretion of testosterone glucuronide in men with the type A behavior pattern

Area of Science:

• Endocrinology
• Behavioral Science
• Cardiovascular Health

Background:

• Type A behavior pattern is associated with increased coronary heart disease (CHD) risk.
• Testosterone's role in CHD pathogenesis is suggested by its higher incidence in men and acceleration of atherogenesis.

Purpose of the Study:

• To compare urinary testosterone glucuronide excretion in Type A versus Type B men.
• To investigate potential hormonal mechanisms underlying the elevated CHD risk in Type A individuals.

Main Methods:

• Compared 24-hour urinary testosterone glucuronide excretion in 13 Type A and 10 Type B men.
• Urine collections were divided into daytime (9 AM - 6 PM), evening, and overnight periods.

Main Results:

• Type A men showed significantly higher daytime testosterone glucuronide excretion (24 µg) than Type B men (15 µg; P < 0.05).
• No significant differences were observed between groups during evening or overnight periods.
• Findings align with previous reports of increased plasma testosterone in Type A men under stress.

Conclusions:

• Type A behavior is associated with elevated daytime testosterone secretion.
• Increased testosterone secretion in Type A men may contribute to their higher risk of coronary heart disease.
• This hormonal difference presents a potential mechanism for the link between Type A behavior and cardiovascular disease.