Motoric Cognitive Risk Syndrome, Aging Disorder
Conditions
Brief summary
The overall objective of the proposal is to examine the epidemiology of the newly reported motoric cognitive risk (MCR) syndrome, which is a pre-dementia syndrome combining subjective cognitive complaint (i.e.; memory complaint) with objective slow gait speed, in the Quebec elderly population. Cognition and locomotion are two human abilities controlled by the brain. Their decline is highly prevalent with physiological and pathological aging, and is greater than the simple sum of their respective prevalence, suggesting a complex age-related interplay between cognition and locomotion. Both declines in cognition and locomotion are associated, furthermore the temporal nature of their association has been unclear for a long time. Recently, a systematic review and meta-analysis has provided evidence that poor gait performance predicts dementia and, in particular, has demonstrated that MCR syndrome is a pre-dementia syndrome, suggesting that low gait performance is the first symptom of dementia. The uniqueness of MCR syndrome is that it does not rely on a complex evaluation or laboratory investigations. Indeed, this syndrome combined subjective cognitive complaint and objective slow gait speed, and is easy to apply in population-based settings. Prevalence and incidence of MCR syndrome, as well as its association with incidence of cognitive decline and impairment, have never been reported in Canada. Nutrition as a determinant of successful aging: The Quebec longitudinal Study (the NuAge study) is a Quebec population-based observational cohort study performed in healthy older community-dwellers adults which provides a unique opportunity to: 1) obtain reliable estimates of MCR syndrome prevalence and incidence, 2) determine the distribution of clinical and biological (blood biomarkers and genetic) characteristics associated with MCR syndrome, 3) examine the association of MCR syndrome and its biological characteristics with cognitive decline and incidence of cognitive impairment in the Quebec elderly population.
Interventions
OTHERData analysis
No intervention, data analysis only
Sponsors
Centre integre universitaire de sante et de services sociaux du Centre-Sud-de-l'Île-de-Montréal
Study design
Observational model
COHORT
Time perspective
RETROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
65 Years to No maximum
Inclusion criteria
* All included participants of NuAge Study
Exclusion criteria
* no information about cognitive complaint in NuAge database * no measure of walking speed in NuAge database * no follow-up completed in NuAge database
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| prevalence of MCR syndrome | 3 years | Diagnosis of MCR syndrome following Verghese et al. criteria |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Cognitive decline and impairment | 3 years | Modified Mini-Mental State (3MS) in the NuAge study. |
| Covariates | 3 years | Cardio-vascular risk factors and diseases assessed using reported health condition |
| Biological characteristics | 3 years | we selected biomarkers that consistently show associations with clinical risk factors for MCR : IL-6, high-sensitivity CRP and Malondialdehyde (MDA). These biomarkers are associated with individual MCR components. CRP was associated with plaques. Inflammation is hypothesized to be a precursor to neurofibrillary tangles and amyloid plaques; hallmarks of AD. Oxidative stress damage is elevated in vulnerable brain regions in early AD and MCI. We propose a multi-level examination of vascular pathways in MCR including biomarkers (CRP and homocysteine). We include homocysteine, a vascular biomarker, linked to gait and cognitive deficits in other studies. |
| Genetic approach | 3 years | we propose to derive polygenic risk scores for cognitive and obesity phenotypes in NuAge, and to examine its predictive validity for MCR syndrome and incident cognitive impairment |
Countries
Canada
Outcome results
None listed