Dual-task walking could reveal cognitive impairment linked to cerebral small vessel disease

An assessment that places greater demands on attention

Cerebral small vessel disease contributes to vascular cognitive impairment. According to the authors, gait abnormalities can appear early in its course and are closely linked to cognitive decline. Measuring them is therefore a potential way to identify difficulties associated with this disease.

Dual-task assessment adds a cognitive demand while walking. This extra demand could reveal cognitive and motor difficulties that are less apparent when someone is simply walking. This is an assessment method, not a training intervention whose effectiveness has been tested.

More apparent differences under dual-task conditions

The review identified nine studies reporting dual-task results and eight reporting walking-only results. Four studies included both conditions. The abstract consulted specifies neither the total number of participants nor the study durations.

Dual-task assessment better distinguished patients with cognitive impairment associated with this disease from controls without cognitive impairment. Under this condition, patients walked more slowly and showed greater stride-time variability, as well as a higher dual-task cost.

These differences were statistically significant. However, the abstract does not report their magnitude: it is therefore impossible to derive a useful threshold for assessing an individual or to quantify the clinical relevance of the differences.

A potential measure, not yet a validated tool

The studies differed in their gait measures, imaging criteria and cognitive tasks. Exploratory analyses suggest that imaging findings could explain some of the differences between studies.

The authors call for research using standardized diagnostic criteria to assess screening performance and the ability to predict cognitive progression. These findings therefore do not allow difficulty walking under dual-task conditions to be interpreted as a diagnosis, nor can this association be generalized to the entire population.

What we can take away

Dual-task walking is a potential approach to assessing cognitive impairment linked to cerebral small vessel disease. Its usefulness for screening for these impairments or predicting their progression remains to be established.