Journal Article Epublish 1 citation
PubMed: 40702042 DOI: 10.1038/s41598-025-10830-4
Gait instability is a more specific predictor of corticospinal tract function than gait speed in clinically stable multiple sclerosis.
Sci Rep 15(1):26822
Authors: Furkan Bilek, Arthur R Chaves, Oleksandr Fesenko, Michelle Ploughman
Affiliations
- Recovery and Performance Laboratory, Division of Biomedical Sciences, Faculty of Medicine, Memorial University of Newfoundland, St. John's, NL, Canada.
- Department of Gerontology, Fethiye Faculty of Health Sciences, Muğla Sıtkı Koçman University, Muğla, Turkey.
- University of Ottawa's The Royal Institute for Mental Health Research, Ottawa, ON, Canada.
- Interdisciplinary School of Health Sciences, Health Sciences Department, University of Ottawa, Ottawa, ON, Canada.
- Recovery and Performance Laboratory, Division of Biomedical Sciences, Faculty of Medicine, Memorial University of Newfoundland, St. John's, NL, Canada.
Abstract
Multiple sclerosis (MS) research requires new, more sensitive, behavioral biomarkers that map to subtle central nervous system injury. Although gait speed, as measured using the Timed 25 Foot Walk Test, is used clinically to track MS progression, it is less useful in people with MS who do not have overt gait impairment. This study aimed to identify specific spatiotemporal gait parameters that predict corticospinal tract (CST) function in individuals with MS. We recruited consecutive patients attending a neurology clinic and evaluated CST excitatory and inhibitory function using single pulse transcranial magnetic stimulation of the primary motor cortex representation of the first dorsal interosseous muscle. We generated excitatory and inhibitory recruitment curves by calculating the area under the curve for motor-evoked potential amplitudes and cortical silent period durations, respectively, across stimulation intensities from 105 to 155% of active motor threshold in 10% increments. Spatiotemporal gait parameters were assessed using an electronic walkway. We built predictive models with gait parameters as the predictors and CST function as the outcome. We evaluated 78 individuals with MS (58 females). Longer distance of the center of pressure movement during single support was the strongest predictor of higher excitability (lower active motor threshold; accounting for 25.8% of variance, R² = 0.258), while less time in double support accounted for a smaller portion of variability in excitatory recruitment curve (13.3% variance explained, R² = 0.133). For inhibitory CST function, slower stride time (30.5% variance explained, R² = 0.305) and wider stride (6.3% variance explained, R² = 0.063) predicted greater inhibition. Notably, in all models, measures of gait stability, not gait speed, predicted CST function. Our results suggest that even among people with MS who have normal gait speed and can easily cross an urban intersection, subtle postural control impairments exist which may not be apparent to them or to their clinician.
MeSH
Sclerosis, Multiple Sclerosis, Gait, Walking Speed, Natural Science Disciplines