The Relationship between Changes in Normal-Range Systolic Blood Pressure and Cognitive Function in Middle-Aged Healthy Women.
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<B>Little is known about the effect of normal-range blood pressure (BP) on cognitive function. In previous studies investigating the relationship between BP and cognitive function in elderly subjects, underlying cerebrovascular damage has complicated the interpretation of results. To reveal the relationship between BP levels that were within an absolutely normal range and cognitive function, we examined cognitive function in normotensive, healthy middle-aged women. BP levels were measured on three separate occasions at 1-month intervals, and the subjects exhibiting normotension (<140/90 mmHg) throughout the evaluation period were recruited as normotensive subjects. Cognitive function was assessed using subtests of the Wechsler Adult Intelligence Scale—Revised. The study demonstrated that, among the subtests examined, the scores on the Digit Symbol Test, an index of psychomotor performance, had a significant correlation with normotensive-range systolic blood pressure (SBP) (<I>r</I> =-0.51, <I>p</I> <0.05); this relation was negative—that is, higher but still normal-range SBP levels were associated with impaired Digit Symbol Test scores. In addition, the relationship adjusted by age and educational level was also significant (partial correlation=-0.56, <I>p</I> <0.05). In contrast, diastolic BP was not related to the Digit Symbol Test (<I>r</I> =-0.33, <I>p</I> =0.13). Furthermore, the Digit Symbol Test was not influenced by blood glucose or serum cholesterol levels. These findings suggested that, even within the normotensive range, lower levels of SBP might be protective against impairment of psychomotor speed in middle-aged women. (<I>Hypertens Res</I> 2002; 25: 565-569)</B>
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