OBJECTIVE: to examine whether usual gait speed, fast gait speed or speed while walking with a cognitive or neuromuscular challenge predicts evolving cognitive decline over 3 years. DESIGN: prospective study. SETTING: population-based sample of community-dwelling older persons. PARTICIPANTS: 660 older participants (age > or = 65 years). MEASUREMENTS: usual gait speed, fastest gait speed, gait speed during 'walking-while-talking', depression, comorbidities, education, smoking and demographics were assessed at baseline. Cognition was evaluated at baseline and follow-up. A decline in MMSE score by > or = 3 points was considered as significant cognitive decline (SCD). RESULTS: adjusting for confounders, only fast speed was associated with cognitive performance at 3-year follow-up. One hundred thirty-five participants had SCD over 3 years. Participants in the lowest quartile of usual speed or walking-while-talking speed were more likely to develop SCD. Conversely, participants in the third and fourth quartiles of fast speed were more likely to develop SCD. J-test showed that the model including fast speed quartiles as a regressor was significantly more predictive of SCD than the models with usual speed or walking-while-talking speed quartiles. CONCLUSION: measuring fast gait speed in older persons may assist in identifying those at high risk of cognitive decline.
OBJECTIVE: to examine whether usual gait speed, fast gait speed or speed while walking with a cognitive or neuromuscular challenge predicts evolving cognitive decline over 3 years. DESIGN: prospective study. SETTING: population-based sample of community-dwelling older persons. PARTICIPANTS: 660 older participants (age > or = 65 years). MEASUREMENTS: usual gait speed, fastest gait speed, gait speed during 'walking-while-talking', depression, comorbidities, education, smoking and demographics were assessed at baseline. Cognition was evaluated at baseline and follow-up. A decline in MMSE score by > or = 3 points was considered as significant cognitive decline (SCD). RESULTS: adjusting for confounders, only fast speed was associated with cognitive performance at 3-year follow-up. One hundred thirty-five participants had SCD over 3 years. Participants in the lowest quartile of usual speed or walking-while-talking speed were more likely to develop SCD. Conversely, participants in the third and fourth quartiles of fast speed were more likely to develop SCD. J-test showed that the model including fast speed quartiles as a regressor was significantly more predictive of SCD than the models with usual speed or walking-while-talking speed quartiles. CONCLUSION: measuring fast gait speed in older persons may assist in identifying those at high risk of cognitive decline.
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