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gain a quick and reliable insight into older people's cognitive ca pability(认知能力)，as it is increasingly recognized that pace is associated with not only musculoskeletal mechanisms but also the central nervous system.Until now,however,no one knew it could signify underlying brain health so much earlier in life. The correlation was so clear,however,that the US scien tists now say walking tests could be used to provide an early symbol of dementia ()Published in the Journal of the A merican Medical Association,the study revealed an average difference of 16 IQ points between the slowest and the fastest walkers at the age of 45.This reflected both the participants'nat- ural walking speed and the pace they achieved when asked to walk as fast as they could.Those with a slower pace also scored