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

Urinary excretion of testosterone glucuronide was compared in 13 men with typical Type A behavior pattern (as determined by structured interviews) and 10 age-matched men with typical Type B behavior pattern. Twenty-four hour urine collections were divided into three periods: 9AM-6PM, 6PM to bedtime, and bedtime to 9AM. Type A men showed a significantly higher excretion than Type B men in the daytime (9AM-6PM): the geometric mean value was 24 μg in Type A and 15 μg in Type B (p<0.05). There were no significant differences between Type A and Type B men for the other two time periods. Indicating an elevated daytime testosterone secretion in Type A men, this finding is consistent with a recent report that exposure to laboratory tests of reaction time causes an increase in plasma testosterone levels and Type A but not Type B men. Since a role for testosterone in the genesis of coronary heart disease (CHD) is suggested by the much higher incidence of CHD in men and the acceleration of murine atherogenesis by testosterone, the findings of this and the previous report may represent a mechanism for the elevated incidence of CHD in Type A men.