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Cognitive-motor interference in persons with multiple sclerosis during five upper limb motor tasks with different

Joke Raats1, Ilse Lamers2, Ilse Baert2

  • 1Rehabilitation Research Center (REVAL) and Biomedical Research Institute (BIOMED), Faculty of Rehabilitation Sciences, Hasselt University, Hasselt, Belgium/De Mick, AZ Klina, Brasschaat, Belgium.

Multiple Sclerosis (Houndmills, Basingstoke, England)
|November 13, 2018
PubMed
Summary

Cognitive-motor interference in upper limb tasks was examined in people with multiple sclerosis (pwMS) and healthy controls (HC). Task complexity influences dual-task cost (DTC), but it was similar between HC and mildly impaired pwMS.

Keywords:
Cognitive-motor interferencedual taskingmultiple sclerosisupper limb

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Area of Science:

  • Neuroscience
  • Rehabilitation Science
  • Human Motor Control

Background:

  • Cognitive-motor interference is well-studied in walking for multiple sclerosis (MS).
  • However, interference during upper limb (UL) performance in MS is less understood.
  • This study investigates dual-task cost (DTC) in UL tasks for persons with multiple sclerosis (pwMS) and healthy controls (HC).

Purpose of the Study:

  • To quantify the dual-task cost (DTC) in pwMS and HC during various upper limb (UL) motor tasks.
  • To compare DTC across different task types and complexities.
  • To assess the impact of cognitive-motor interference on UL performance in MS.

Main Methods:

  • 30 pwMS and 30 HC performed five UL tasks (unimanual and bimanual) under single and dual-task conditions (with a cognitive task).
  • Motor, cognitive, and combined DTC were calculated as percent change in performance.
  • Statistical analyses included unpaired/paired t-tests and multivariate analysis of variance.

Main Results:

  • Motor DTC varied from 10% (bimanual Purdue pegboard) to 35% (box-and-block test).
  • Cognitive DTC ranged from -8% (finger tapping) to +21% (bimanual Purdue pegboard).
  • Combined DTC did not significantly differ between pwMS and HC across tasks.

Conclusions:

  • Dual-task cost (DTC) in upper limb (UL) tasks is influenced by task complexity.
  • No significant difference in DTC was observed between healthy controls (HC) and persons with multiple sclerosis (pwMS) with mild motor impairment and intact cognition.
  • Findings suggest cognitive-motor interference during UL tasks may not be significantly exacerbated in mildly affected MS patients.