Document Detail

The trajectory of gait speed preceding mild cognitive impairment.
MedLine Citation:
PMID:  20697049     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: To compare the trajectory of motor decline, as measured by gait speed and finger-tapping speed, between elderly people who developed mild cognitive impairment (MCI) and those who remained cognitively intact. We also sought to determine the approximate time at which the decline in motor function accelerated in persons who developed MCI.
DESIGN: Longitudinal cohort study.
PARTICIPANTS: Participants were 204 healthy seniors (57.8% women) from the Oregon Brain Aging Study evaluated for up to 20 years using annual neurologic, neuropsychological, and motor examinations.
MAIN OUTCOME MEASURES: The pattern of motor decline with aging was compared using a mixed-effects model with an interaction term for age and a clinical diagnosis of MCI. The time before diagnosis of MCI, when the change in gait or finger-tapping speed accelerates, was assessed using a mixed-effects model with a change point for men and women, separately and combined, who developed MCI.
RESULTS: The rates of change, with aging, in gait speed (P < .001) and finger-tapping speed in the dominant hand (P = .003) and nondominant hand (P < .001) were significantly different between participants who developed MCI (converters) and those who did not (nonconverters). Using a change point analysis for MCI converters, the decrease in gait speed accelerated by 0.023 m/s/y (P < .001), occurring 12.1 years before the onset of MCI. An acceleration in gait speed decline occurred earlier in men than women. For tapping speed, the change point occurred after the onset of MCI for both dominant and nondominant hands when men and women were combined.
CONCLUSIONS: Motor decline as indexed by gait speed accelerates up to 12 years before MCI. Longitudinal changes in motor function may be useful in the early detection of dementia during preclinical stages, when the utility of disease-modifying therapies would be greatest.
Teresa Buracchio; Hiroko H Dodge; Diane Howieson; Dara Wasserman; Jeffrey Kaye
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Archives of neurology     Volume:  67     ISSN:  1538-3687     ISO Abbreviation:  Arch. Neurol.     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-08-10     Completed Date:  2010-09-03     Revised Date:  2014-09-09    
Medline Journal Info:
Nlm Unique ID:  0372436     Medline TA:  Arch Neurol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  980-6     Citation Subset:  AIM; IM    
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MeSH Terms
Aged, 80 and over
Cognition Disorders / complications*
Cohort Studies
Gait Disorders, Neurologic / etiology*
Geriatric Assessment
Neuropsychological Tests
Psychomotor Performance / physiology*
Sex Factors
Grant Support
K01 AG023014/AG/NIA NIH HHS; K01 AG023014-06/AG/NIA NIH HHS; K01AG023014/AG/NIA NIH HHS; P30 AG008017/AG/NIA NIH HHS; P30 AG008017-20/AG/NIA NIH HHS; P30 AG008017-216840/AG/NIA NIH HHS; P30AG008017/AG/NIA NIH HHS; R01 AG024059/AG/NIA NIH HHS; R01 AG024059-05/AG/NIA NIH HHS; R01AG024059/AG/NIA NIH HHS

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