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(Hypertension. 1997;30:1289-1294.)
© 1997 American Heart Association, Inc.

Articles

Association of Calcitriol and Blood Pressure in Normotensive Men

Estela Kristal-Boneh; Paul Froom; Gil Harari; Joseph Ribak

From the Occupational Health and Rehabilitation Institute (E.K.-B., P.F., G.H., J.R.), Raanana, and the Sackler Faculty of Medicine (P.F., J.R.), Tel Aviv University, Tel Aviv, Israel.

Correspondence to Dr E. Kristal-Boneh, Occupational Health and Rehabilitation Institute, POB 3, Raanana 43100, Israel.

Abstract The purpose of this study was to clarify the possible associations between the serum 1,25-dihydroxyvitamin D (calcitriol) level and blood pressure. Cross-sectional analysis of data was performed. Data collected included levels of serum calcitriol, parathyroid hormone, serum calcium, and blood lead; blood pressure; dietary history; and demographic and anthropometric variables. One hundred normotensive male industrial employees made up the study population. Systolic blood pressure and diastolic blood pressure were main outcome measures. After possible confounders were controlled for, multivariate analyses yielded an inverse, independent, and statistically significant association between calcitriol level and systolic blood pressure (standardized ß=-0.2704, P=.0051). A similar trend of borderline significance was found for the association between calcitriol and diastolic blood pressure (standardized ß=-0.1814, P=.0611). Parathyroid hormone, serum calcium, and blood lead levels were not associated with blood pressure. When subjects were divided into four groups by calcitriol level, those in the lowest quartile showed significantly higher systolic and diastolic blood pressures than those in the upper quartile (difference=11 mm Hg, P=.007, and difference=4 mm Hg, P=.071, respectively). There is an inverse association between serum calcitriol level and blood pressure. This suggests that in addition to its role in calcium homeostasis, the active metabolite of vitamin D may play a role in determining blood pressure. The differences in both systolic and diastolic blood pressures between the upper and lower quartiles of serum calcitriol were substantial and may be of clinical significance.

Key Words: vitamin D • blood pressure • lead

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