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The Effect Of Dietary Caffeine On Voiding Function
Richard C Harkaway, Phillip Ginsberg*, Michael Metro
Albert Einstein Medical Center, Philadelphia, PA
Introduction: Relatively few studies have been carried out to determine the effect of dietary caffeine on the urinary bladder. Our goal was to determine a correlation, if any, between caffeine intake and AUA symptom scores in men.
Methods: Over a 12 month period, 97 men were given the AUA symptom index questionnaire with an additional thirteen question caffeine intake survey. Each patient’s daily caffeine intake was calculated in milligrams. The Pearson product-moment coefficient of correlation and regression were used for statistical analysis.
Results: The covariance of caffeine and total symptom score was 36.38 with an r value of .045 and the coefficient of determination was .002. This would indicate a relatively weak correlation, suggesting that there is little to no association between caffeine intake and overall symptom scores in men. Each of the seven questions in the AUA symptom score questionnaire was also separately analyzed for correlation with caffeine intake and proved to have no statistical correlation.
Conclusions: Multiple studies of isolated detrusor specimens have shown that caffeine stimulates muscle contraction in animal models. Our study, however, showed that there was no correlation between caffeine intake and AUA symptom scores in men. Further studies are necessary to fully examine the effects of dietary caffeine on the human bladder.
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