Murayama H, Shinkai S, Nishi M, Taniguchi Y, Amano H, Seino S, Yokoyama Y, Yoshida H, Fujiwara Y, Ito H. Albumin, Hemoglobin, and the Trajectory of Cognitive Function in Community-Dwelling
Older Japanese: A 13-Year Longitudinal Study.
J Prev Alzheimers Dis 2018;
4:93-99. [PMID:
29186279 DOI:
10.14283/jpad.2016.113]
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Abstract
BACKGROUND
Cognitive function can substantially decline over a long period, and understanding the trajectory of cognitive function is important. However, little is known about the linkage between nutritional biomarkers and long-term cognitive change.
OBJECTIVES
We analyzed 13-year longitudinal data for older Japanese to examine the associations of serum albumin and hemoglobin levels with the trajectory of cognitive function.
DESIGN
Longitudinal study.
SETTING
Community-based.
PARTICIPANTS
A total of 1,744 community-dwelling adults aged 65 years or older who participated in annual health examinations in Kusatsu town, Gunma Prefecture, Japan, from 2002-2014.
MEASUREMENTS
Cognitive function was assessed annually by the Mini-Mental State Examination (MMSE). Albumin and hemoglobin levels at baseline (the year when a respondent first participated in the health examination) were divided into quartiles. Hierarchical linear modeling was used to analyze intrapersonal and interpersonal differences in cognitive function.
RESULTS
Participants' MMSE scores decreased at an accelerated rate over the 13-year period. Participants with the lowest baseline albumin level (below the first quartile line) showed a greater accelerated decline in MMSE scores over time, compared with those with the highest level (above the third quartile line). Moreover, MMSE scores in participants with a lower hemoglobin level and lower MMSE score at baseline tended to decline faster over time at an accelerated rate.
CONCLUSIONS
These findings yield new insights about the complex and diverse roles of these nutritional biomarkers on the trajectory of cognitive function in old age.
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