(Hypertension. 2001;38:1361.)
© 2001 American Heart Association, Inc.
Scientific Contributions |
From INSERM U558, Faculté de Médecine Purpan, Toulouse (P. M-V., J.F.), France; MONICA-Strasbourg, Laboratoire dEpidémiologie et de Santé Publique (D.A.), Strasbourg, France; Belfast-MONICA, Department of Epidemiology, The Queens University of Belfast (A.E.), Belfast, United Kingdom; INSERM U508, Institut Pasteur de Lille (P.A.), Lille, France; and INSERM U258, Hôpital Paul Brousse (P.D.), Villejuif, France.
Reprint requests to Jean Ferrières, INSERM U558, Faculté de Médecine Toulouse-Purpan, Département dEpidémiologie, 37, Allées Jules Guesde, 31073 Toulouse Cedex, France.
| Abstract |
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Key Words: alcohol drinking blood pressure periodicity
| Introduction |
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Alcohol consumption is positively associated with BP.6 In France, alcohol consumption is regular throughout the week, whereas in Northern Ireland, most of the alcoholic consumption occurs on Fridays and Saturdays, with little consumption during the other days.7 Furthermore, it has been shown that the effects of an acute intake of alcohol are somewhat different than that of regular intake. For instance, consistent regular drinking is a more important determinant of the alcohol/BP relationship than intake in the previous 24 hours8; additionally, a single intake of alcohol has a depressor effect on BP that lasts for several hours after drinking, whereas repeated intakes for 7 days have both depressor and pressor effects according to the differences in time intervals after the last drink,9 this biphasic effect being found by other authors.10,11 Thus, we wondered whether the pattern of intake in Northern Ireland could also influence BP levels during the week compared with the pattern of intake in France. Hence, we used the data from the Prospective Epidemiological Study of Myocardial Infarction (PRIME), which involved France and Northern Ireland, to analyze the relationships between alcohol consumption and BP levels from Monday to Friday in middle-aged, healthy men.
| Methods |
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Personal and Medical History
Self-administered questionnaires relating to demographic and socioeconomic factors and diet were completed at home by the participants and checked by the interviewer at the clinic. Data on level of education, occupational activity, personal and family history, tobacco and alcohol consumption, drug intake, and physical activity were collected.
Alcohol Consumption
Alcohol consumption was assessed by a questionnaire in which the subject reported his average consumption (in units) of wine, beer, cider, and spirits for each day of the week. Alcohol consumption (expressed in milliliters of pure ethanol per day) was estimated from the average number of milliliters of ethanol in a serving of each type of alcoholic beverage: wine, 12-cL serving, 10% or 12% alcohol (vol/vol); beer, 12-cL serving, 5% alcohol, 25- or 33-cL serving, 6% or 8% alcohol; cider, 12-cL serving, 5% alcohol; and spirits, 2- or 6-cL serving, 20% or 40% alcohol. Because one of the hypotheses of this work was that BP levels were dependent on the average alcohol consumption of the previous days, individual consumption of alcohol of the days before (lag0=current, lag1=the day before, lag2=2 days before, etc) was computed.
BP Measurement
BP was measured once with an automatic device (Spengler SP9) at the end of the examination after a 5-minute rest in the sitting position and before blood draw. A standard cuff size was used, but a large cuff was available when necessary. At least 3 measuring devices were available at any time in each center, and all 3 were equally used. To avoid systematic differences between centers, the devices were circulated between them. The devices were recalibrated every 3 months in the coordinating center in Paris.
Statistical Analysis
Statistical analysis was conducted with the use of SAS software. Subjects with history of angina pectoris, myocardial infarction (MI), and possible coronary heart disease and those treated for hypertension and/or dyslipidemia were excluded from the analysis. Results were expressed as mean±SD or adjusted mean±SEM or number of subjects and percentage, unless otherwise stated. Univariate comparisons between countries were performed with
2 and Students t tests. Multivariate comparisons were performed with a general linear model (Proc GLM) of SAS. Statistical significance was considered for P<0.05.
An expanded Methods section can be found in an online data supplement available at http://www.hypertensionaha.org.
| Results |
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Average alcohol consumption was slightly higher in Northern Ireland than in France (325±333 versus 317±249 mL of ethanol per week; P<0.01, Kruskal-Wallis test). Breakdown by day of the week indicated that total alcohol consumption was evenly distributed throughout the week (with a slight increase on weekends) in France, whereas Fridays and Saturdays accounted for two thirds of total alcohol consumption in Northern Ireland (Figure).
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BP Levels by Day of the Week
After adjustment for age, body mass index, heart rate, number of years of education, marital status, occupational activity, and smoking status, drinkers from Northern Ireland had significantly higher levels of systolic BP (SBP) and lower levels of diastolic BP (DBP) than their French counterparts (Table 2). In addition, significant between-day differences and countryxday interactions were noted for SBP and DBP. Those differences and interactions remained significant even after adjustment for total alcohol consumption (data not shown). Close inspection of the data indicated that in Northern Ireland, SBP and DBP levels were higher on Monday and decreased until Thursday, with a further increase on Friday (Table 2). Conversely, no such relationship was found for nondrinkers (Table 3).
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Correlation Between Cardiovascular Risk Factors and Prior Alcohol Consumption
In Northern Ireland, SBP and DBP were significantly correlated with the mean amount of alcohol consumed 3 and 4 days before (lag3 and lag4), whereas the correlations for the other lags were not statistically significant. Conversely, in France the relationship between SBP and DBP and the amount of alcohol consumption did not show any fluctuation for all lags tested.
Effects of Adjustment for the Amount of Alcohol Consumed
Because BP levels were significantly associated with average alcohol consumption 3 days before, an adjustment on lag3 was performed by introducing the alcohol consumption 3 days before in the model. Additionally, because the effect of the alcohol consumed on Fridays and Saturdays was supposed to decrease during the next week (higher effect on Mondays to Wednesdays, lower afterward), a dayxlag3 interaction was also introduced. This adjustment canceled out the differences between days as well as the countryxday interaction for SBP and DBP (Table 4). Further adjustment on lag4 or on other lags did not improve the model (not shown).
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| Discussion |
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The effect of an acute intake of alcohol on BP levels differs according to the time elapsed and the consumption pattern. Several authors have shown that acute alcohol consumption leads to a decrease in BP levels 2 to 24 hours after consumption.1518 Nevertheless, some authors have shown that BP levels actually increase the day after acute alcohol consumption.10,19 Thus, although higher SBP and DBP levels were found on Mondays among Northern Irish drinkers, because no BP measurements were performed on Sundays, the hypothesis regarding whether BP levels are increased or decreased on Sundays cannot be substantiated in this study.
The biological mechanisms by which acute alcohol consumption modulates BP levels are still controversial: acute alcohol consumption has been shown to modulate intracellular sodium16 and to decrease adrenoceptor-mediated cardiovascular reactivity,20,21 but the precise relationships between the rise in BP after regular, moderate alcohol consumption remain to be assessed. It should also be stressed that alcohol consumption occurs mostly with meals in France, whereas Northern Irish binge drinkers tend to consume alcohol without any other nutritional intake. Because blood alcohol levels are influenced by the concomitant absorption of a meal,22 chronic alcohol consumption,23 the concentration of ingested ethanol,24 and the time during which alcohol is consumed,25 it is conceivable that the metabolic effects of alcohol depend on the pattern of alcohol drinking. It is also possible that binge drinking is associated with an increased consumption of cigarettes,26 which could lead to an increase in fibrinogen levels,27 or with the consumption of salted food such as peanuts and potato chips, which would increase BP levels. Although we did not assess the daily consumption of cigarettes or salted food, those hypotheses deserve further investigation. Another possible explanation for the higher BP levels on Monday among binge drinkers might be the metabolic effects of beer that are not related to alcohol. For instance, beer intake has been associated with hyponatremia due to the hyposmolality of the beer ingested28; this would lead to secondary hyperaldosteronism, with an increase in vascular tone and hypertension. Indeed, a stronger relationship between SBP and DBP was found for beer (Spearman correlation=0.17 and 0.16 for SBP and DBP, respectively, for France [P<0.001]; and r=0.10 and r=0.08, respectively, for Northern Ireland [P<0.01]) than for wine (Spearman correlation=0.04 [P<0.01] and 0.02 [P=NS] for SBP and DBP, respectively, for France; and r=-0.05 and r=-0.03, respectively, for Northern Ireland [both P=NS]). It is thus tempting to speculate that the high amount of beer consumed during weekends by Northern Irish drinkers would lead to transient hyponatremia, with an increase in aldosterone levels, leading to higher BP levels on Mondays. Another possibility would be the higher potassium content as well as the higher potassium/sodium content of wine relative to other alcoholic beverages, which could modulate BP effects.29
Introducing a lag3xday interaction was found necessary to mimic the effect of the large amount of alcohol consumed at weekends in Northern Ireland, because it was expected that this effect would decrease during the week. Indeed, the introduction of the lag3xday interaction canceled out the differences in BP levels between days, whereas without this interaction the differences and interactions persisted (not shown). Similar results were obtained when the average alcohol consumption for Saturday (and its interaction with the day of the week) was used, but because this model did not take into account the amount of alcohol consumed the other days of the week, it was not retained. Nevertheless, those findings indicate that the amount of alcohol consumed during the weekend will influence BP levels on Mondays (and their decrease until Thursdays) among Northern Irish drinkers. Interestingly, adjustment for total alcohol consumption did not cancel out the between-day differences or the countryxday interaction. Thus, in this study time elapsed since last drink appears to be more important than total alcohol consumption in explaining the between-day differences and the countryxday interaction for BP levels. Still, the reasons for BP levels being correlated with the average amount of alcohol consumed 3 days before remain to be assessed.
The question that motivated this study was whether the amount of alcohol consumed on weekends in Northern Ireland could partly account for the higher incidence of MI observed in populations with a similar pattern of alcohol intake. If it was alcohol that explained this higher incidence of MI on Mondays among drinkers, then no such increase in MI risk or in BP levels should be found among Northern Irish teetotalers. Indeed, no between-day differences were found for SBP and DBP for Northern Irish teetotalers, and no countryxday interactions were found when Northern Irish teetotalers were compared with their French counterparts. Again, those findings support the hypothesis that the high intake of alcohol on weekends could partly explain the higher incidence of MI on Mondays, via an increase in SBP and DBP levels.
Finally, it should be stressed that in this study BP levels were assessed in different subjects for each day of the week. Hence, it would be possible that the differences observed in Northern Irish drinkers be attributable to differences in the characteristics of the subjects attending the clinic. Nevertheless, no between-day differences were found regarding age, body mass index, years of school, marital and smoking status, and occupational activity (employed/unemployed) among drinkers in Northern Ireland (data not shown), making this possibility unlikely to explain such differences.
In summary, our results indicate that the binge-drinking pattern observed among Northern Irish drinkers leads to physiologically disadvantageous consequences regarding BP levels, whereas no such fluctuations in BP levels are found for a regular consumption. The fluctuations in BP levels due to the binge-drinking pattern could also partly explain the higher incidence of MI on Mondays in countries characterized by a high alcohol intake on weekends.
| Appendix |
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| Acknowledgments |
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Received March 9, 2001; first decision April 23, 2001; accepted May 31, 2001.
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