Vitamin D status and measures of cognitive function in healthy older European adults


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Abstract

Background/Objectives:Data from human studies that have investigated the association between vitamin D status and cognitive function in elderly adults are conflicting. The objective of this study was to assess vitamin D status (reflected by serum 25-hydroxyvitamin D (25(OH)D)) in older European subjects (n=387; aged 55–87 years) and examine its association with measures of cognitive function.Subjects/Methods:Serum 25(OH)D was assessed using enzyme-linked immunosorbent assay, whereas measures of cognitive function were assessed using a comprehensive Cambridge Neuropsychological Testing Automated Battery (CANTAB).Results:In all, 12, 36 and 64% of subjects had serum 25(OH)D concentrations <30, <50 and <80 nmol/l, respectively, throughout the year. Serum 25(OH)D was significantly and inversely correlated with four assessments within the spatial working memory (SWM) test parameter (SWM between errors (r=−0.166; P=0.003); SWM between errors 8 boxes (r=−0.134; P=0.038); SWM strategy (r=−0.246; P<0.0001); and SWM total errors (r=−0.174; P<0.003)). When subjects were stratified on the basis of tertiles (T) of serum 25(OH)D (<47.6 (T1); 47.6–85.8 (T2); and >85.8 (T3) nmol/l), fewer errors in SWM test scores occurred in subjects in the third T when compared with the first T (P<0.05–0.084). Stratification by sex showed that these differences between tertiles strengthened (P<0.001–0.043) in the females, but the differences were not significant (P> 0.6) in males.Conclusions:Vitamin D insufficiency, but not deficiency, is widespread in the older population of several European countries. Low vitamin D status was associated with a reduced capacity for SWM, particularly in women.

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