Alcohol consumption and blood pressure in Japanese men.

In a study of Japanese men, a nonlinear association of alcohol consumption and blood pressure was not observed. This cross-sectional study was conducted to clarify the effect of infrequent or light alcohol consumption on blood pressure in normotensive Japanese men. The subjects were 2,179 male workers ranging in age from 40 to 54 years. Drinking habits were represented by three indices: episodic alcohol consumption, frequency of drinking, and monthly alcohol consumption. Seven items were analyzed as covariates: age, body mass index, salt intake, physical activity, and levels of gamma-glutamyl transpeptidase, uric acid, and plasma glucose. The association between drinking habits and blood pressure was evaluated by using analysis of covariance. Both episodic alcohol consumption and frequency of drinking were significantly associated with blood pressure in subjects aged 45 to 54 years. In those aged 40 to 44 years, there was a significant association between frequency of drinking and diastolic blood pressure. Significant associations of monthly alcohol consumption with blood pressure in every age group also were found. In subjects aged 45 to 54 years, linear associations between episodic alcohol consumption, frequency of drinking, monthly alcohol consumption, and adjusted blood pressure were observed. In those aged 40 to 44 years, nonlinear associations of monthly alcohol consumption and frequency of drinking with adjusted blood pressure were observed, and threshold effects of 540 ml of alcohol per month and a frequency of 1 to 12 days per month were found. In conclusion, habitual alcohol consumption increases blood pressure linearly in normotensive workers aged 45 to 54 years, although light consumption does not affect blood pressure in those aged 40 to 44 years.