Constraints on perception of information from obstacles during foot clearance in people with chronic stroke

SHAFIZADEHKENARI, Mohsen, WHEAT, Jonathan, DAVIDS, Keith, ANSARI, Noureddin Nakhostin, ALI, Ali and SAMIRA, Garmabi (2017). Constraints on perception of information from obstacles during foot clearance in people with chronic stroke. Experimental Brain Research, 235 (6), 1665-1676.

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The aim of this study was to examine effects of different types of task constraints on coupling of perception and action in people with chronic stroke when crossing obstacles during a walking task. Ten participants with hemiplegic chronic stroke volunteered to walk over a static obstacle under two distinct task constraints: simple and dual task. Under simple task constraints, without specific instructions, participants walked at their preferred speed and crossed over an obstacle. Under dual task constraints the same individuals were required to subtract numbers whilst walking. Under both distinct task constraints, we examined emergent values of foot distance when clearing a static obstacle in both affected and unaffected legs, measured by a 3D motion tracking system. Principal Component Analysis was used to quantify task performance and discriminant analysis was used to compare gait performance between task constraints. Results suggested that patients, regardless of affected body side, demonstrated differences in perception of distance information from the obstacle, which constrained gait differences in initial swing, mid-swing and crossing phases. Further, dual task constraints, rather than hemiplegic body side, was a significant discriminator in patients' perceptions of distance and height information to the obstacle. These findings suggested how performance of additional cognitive tasks might constrain perception of information from an obstacle in people with chronic stroke during different phases of obstacle crossing, and thus may impair their adaptive ability to successfully manoeuvre around objects.

Item Type: Article
Research Institute, Centre or Group: Centre for Sports Engineering Research
Departments: Health and Well-being > Department of Sport
Identification Number:
Depositing User: Mohsen Shafizadeh
Date Deposited: 09 Mar 2017 15:45
Last Modified: 16 Nov 2018 13:31

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