Insulin Resistance-Varying Associations of Adiposity Indices with Cerebral Perfusion in Older Adults: A Population-Based Study

• Published in: The Journal of nutrition, health & aging health & aging, 2023, Vol.27 (3), p.219-227
• Main Authors: Han, X. D., Li, Y. J., Wang, P., Han, X. L., Zhao, M. Q., Wang, J. F., Li, C. Y., Tian, N., Han, X. J., Hou, T. T., Wang, Y. X., Song, Lin, Du, Yifeng, Qiu, C. X.
• Format: Article
• Language: English
• Subjects: Adiposity; Aged; Aging; Anthropometry - methods; Body fat; Body Mass Index; Brain; Cross-Sectional Studies; Dementia; Female; Geriatrics/Gerontology; Humans; Insulin Resistance; Male; Medicin och hälsovetenskap; Medicine; Medicine & Public Health; Neurosciences; Nutrition; Obesity; Obesity - complications; Older people; Original Research; Population-based studies; Primary Care Medicine; Quality of Life Research; Waist Circumference
• ISSN: 1279-7707; 1760-4788; 1760-4788
• DOI: 10.1007/s12603-023-1894-2

Objectives Excessive accumulation of adipose tissue may accelerate brain aging, but the underlying mechanisms are poorly understood. Several adiposity indices were proposed to assess obesity, while their linkage with brain health in older adults remained unclear. Here we aimed to examine the associations of adiposity indices with global and regional cerebral blood flow (CBF) in older adults, while considering insulin resistance. Design This was a cross-sectional population-based study that included older adults derived from the baseline participants in the ongoing Multimodal Interventions to Delay Dementia and Disability in rural China (MIND-China) study. Setting And Participants The study included 103 Chinese rural-dwelling older adults (age≥60 years; 69.9% women) who underwent brain magnetic resonance imaging scans. Methods We estimated eight adiposity indices based on anthropometric measures. We automatically quantified global and regional CBF using the arterial spin labeling scans. Insulin resistance was assessed using the triglyceride-glucose index and then dichotomized into high and low levels according to the median. Data were analyzed using general linear model and voxel-wise analysis. Results Of the eight examined adiposity indices, only higher waist-to-height ratio (WHtR) and body roundness index (BRI) were associated with reduced global CBF (multivariable-adjusted β-coefficients and 95%CI: −1.76; −3.25, −0.27 and −1.77; −3.25, −0.30, respectively) and hypoperfusion in bilateral middle temporal gyri, angular gyri and superior temporal gyri, left middle cingulum and precuneus (P