COMMETS- Combination MCI Metabolic Syndrome

The cognitive outcome is a balanced composite sum of z-scores of four executive function tests (Trails B, Digit-Symbol, and Category Fluency (animals, fruits and vegetables), four episodic memory tests (immediate and delayed recall of the word list from the ADAS-Cog, and immediate and delayed recall of Logical Memory Story I from the Wechsler Memory Test). Z-scores are reversed if necessary so that a positive value refers to good cognition. Cognitive functioning will be measured at baseline, 6 months, and 12 months follow-ups.

Change in CBF will be measured using Arterial Spin Labeling (ASL) brain magnetic resonance imaging (MRI) scans. The unit of cerebral blood flow from ASL is ml/100g/min, which means the amount of blood flow into 100g of tissue in one minute. Scans will be taken at baseline and 6 months follow-up. Baseline and 6 months scans will be compared and analyzed to assess change in blood flow between the time points.

Brain Glucose intake will be measured by [F18]FDG-PET: Voxel-wise standardized uptake value ratio (SUVR) images will be created in native MRI space with the pons as reference region. [F18]FDG values will be extracted from ADRD-vulnerable regions of interest (dorsolateral prefrontal cortex, medial and lateral temporal lobe, and medial and lateral parietal cortex). Scans will be taken at baseline and 6 months follow-up. Baseline and 6 months scans will be compared and analyzed to assess change in glucose intake between the time points.

Cognitive outcomes will be the domain-specific composites, for executive functions and episodic memory, by using four executive function tests (Trails B, Digit-Symbol, and Category Fluency [animals, fruits and vegetables), and four episodic memory tests (immediate and delayed recall of the word list from the ADAS-Cog, and immediate and delayed recall of Logical Memory Story I from the Wechsler Memory Test). Cognitive outcomes will be measured at baseline, 6 months, and 12 months follow-ups

Changes in White matter hyperintensity (WMH) volume: Total WMH volume of presumed ischemic origin will be quantified from 3D T2-FLAIR brain MRI using the Lesion Segmentation Tool. T1-weighted volumetric scans will be used to derive intracranial volume. Scans will be taken at baseline and 6 months follow-up. Baseline and 6 months scans will be compared and analyzed to assess change in WMH volume between the time points.

Changes in gray matter (GM) and hippocampal volumes: neurodegeneration will be measured using T1-weighted scans brain MRI scans. Regional cortical GM and hippocampal volumes will be extracted using FreeSurfer 7.1.1. and FSL. Scans will be taken at baseline and 6 months follow-up. Baseline and 6 months scans will be compared and analyzed to assess change in GM and hippocampal volumes between the time points.

Change in functional performance will be measured by the Clinical Dementia Rating (CDR) Scale Sum of Boxes (SB). The CDR-SB summarizes cognitive impairment in 6 domains (memory, orientation, judgment/problem-solving, community affairs, home/hobbies, and personal care) based on subject and informant interviews. Possible scores on the CDR are 0 (no impairment), 0.5 (very mild), 1 (mild), 2 (moderate), and 3 (severe). A maximal CDR-SB score is -18. CDR will be measured at baseline, 6 months, and 12 months follow-ups.

Functional Activities will be based on subject and informant interviews. Both ADLs (activities of daily living) and IADLs (instrumental ADLs) refer to key life tasks that need to be accomplish daily. ADLs, are more basic tasks that are essential to independent living. IADLs, are more complex tasks that are still a necessary part of everyday life. The study subjects are MCI, so mostly independent in ADLs. Therefore, the IADL questionnaire used in the "ADCS Prevention Instrument Project" will be used. IADL will be assessed at baseline, 6 months and 12 months. The range score is 0-45; a higher score means that the subject is more independent.

Physical capacity (PC) assessment (aerobic, balance, strength) includes grip strength, 6-m walk (6MWT), timed up and go (TUG), Berg balance testing (BBS), 30 Seconds Sit To Stand Test (STS), Four Square Step Test (FSST) and the Fried frailty scale. Based on the collected data, individuals will be categorized and assigned to 1 of 3 categories: low PC (LPC), medium PC (MPC), or normal PC (NPC). Participants will receive an LPC score if either standardized 6MWT/STS/Grip score is ≤ -2 standard deviation or BBS score ≤36 or TUG score between 21-30 or FSST score > 15 seconds or deemed as frail assessed by the Fried scale. Participants will have an MPC score if either the standardized 6MWT/STS/Grip score is between -2 and -1.5 or BBS score is between 37-45 or the TUG score is between 15-20 or FSST score is between 10.14-14.59 or determined as pre-frail by Fried scale. All other participants will be categorized as NPC. Physical capacity will be measured at baseline and 6 months follow-up.

A lower amyloid beta (Aβ) 42/Aβ 40 ratio in plasma is associated with a higher risk of dementia. Aβ 42/Aβ 40 plasma ratio will be measured at baseline and 6 months followup and will be compared to assess change in ADRD-blood biomarkers between the time points.

A higher rate of P-tau181 in plasma is associated with a higher risk of dementia. Change in rate of plasma tau proteins in blood plasma from baseline to 6 months will be assessed.

A higher rate of P-tau231associated with a higher risk of dementia. Change in rate of plasma P-tau231 proteins from baseline to 6 months will be examined.

A higher rate of T-tau associated with a higher risk of dementia. Change in rate of plasma T-tau proteins in blood plasma from baseline to 6 months will be examined.

A higher rate of neurofilament light (NfL) is associated with a higher risk of dementia. Change in rate of plasma tau proteins in blood plasma from baseline to 6 months will be examined.

A higher rate of glial fibrillary acidic protein (GFAP) is associated with a higher risk of dementia. Change in rate of plasma GFAP in blood plasma from baseline to 6 months will be examined.