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Title: Test-Retest Reliability of Cognitive-Motor Interference Assessments in Walking With Various Task Complexities in Persons With Multiple Sclerosis
Authors: VELDKAMP, Renee 
Romberg, Anders
Hämäläinen, Paivi
GIFFROY, Xavier 
LEONE, Carmela 
FEYS, Peter 
BAERT, Ilse 
Issue Date: 2019
Source: Neurorehabilitation and neural repair, 33 (8), p. 623-634
Abstract: Background. Simultaneous execution of motor and cognitive tasks can result in worsened performance on one or both tasks, indicating cognitive-motor interference (CMI). A growing amount of research on CMI in persons with multiple sclerosis (pwMS) is observed. However, psychometric properties of dual-task outcomes have been scarcely reported. Objective. To investigate the between-day test-retest reliability of the motor and cognitive dual-task costs (DTCs) during multiple CMI test conditions with various task complexities in pwMS and matched healthy controls (HCs). Methods. A total of 34 pwMS (Expanded Disability Status Scale score 3.0 ± 0.8) and 31 HCs were tested and retested on 3 single cognitive, 4 single motor, and 12 cognitive-motor dual tasks. Cognitive tasks included serial subtraction by 7, titrated digit span backward, and auditory vigilance. Motor tasks were walking at self-selected speed, over obstacles, crisscross, and while carrying a water-filled cup. Outcome measures were cognitive and motor DTC, calculated as percentage change of dual-task performance compared with single-task performance. Intraclass correlations (ICCs) and Spearman correlation coefficients were calculated as appropriate. Results. For DTCmotor of gait speed, ICCs ranged from 0.45 to 0.81 and Spearman correlations from 0.74 to 0.82. For DTCcognitive, ICCs ranged from −0.18 to 0.49 and Spearman correlations from −0.28 to 0.26. Reliability depended on the type of motor and cognitive task. Conclusion. Reliability of the DTCmotor was, overall, good, whereas that of the DTCcognitive was poor. The “walking” and “cup” dual-task conditions were the most reliable regardless of the integrated cognitive task.
Notes: Veldkamp, R (reprint author), Hasselt Univ, Fac Rehabil Sci, Reval Rehabil Res Ctr, Martelarenlaan 42, B-3500 Hasselt, Belgium.
Keywords: multiple sclerosis;reliability;cognitive-motor interference;walking;gait;dual task
Document URI:
ISSN: 1545-9683
e-ISSN: 1552-6844
DOI: 10.1177/1545968319856897
ISI #: 000480261900004
Rights: The Author(s) 2019. Article reuse guidelines:
Category: A1
Type: Journal Contribution
Appears in Collections:Research publications

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