Association between gait and cognition in an elderly population based sample.

The sample was highly selected: cognitively healthy, well-educated, predominantly male, and physically active. Results cannot be generalised to people with cognitive impairment, lower education, or frailty. The study was cross-sectional, so it cannot determine whether gait changes cause cognitive decline or vice versa. Cognitive scores showed very little variance (ceiling effect), meaning the study likely lacked power to detect small but real associations between gait and cognition. Physical health and medical history were assessed mainly by self-report, without a full neurological examination. The study excluded participants with MoCA scores below 26, removing the population where gait-cognition links are most clinically relevant.

The paper reports funding from the Wellcome Trust and the Medical Research Council. The authors declared no conflicts of interest. The study used data from the Whitehall II Imaging Sub-study, which is a public health research resource, not an industry-sponsored trial.

Do not conclude that gait and cognition are unrelated in older adults. This null finding applies only to a highly educated, cognitively healthy sample with little variation in cognitive scores. In people with mild cognitive impairment or lower baseline function, walking speed often does correlate with cognitive decline.