Inter-limb Center of Pressure Changes and Stance Asymmetry during Long Duration Quiet Standing in Individuals with Hemiplegia Post-Stroke

Kabir Ujalan

Authors

Kabir Ujalan Electrical Engineering and Computer Science Department, Izmir Institute of Technology, Turkey, Izmir

Abstract

This study aimed to investigate center of pressure (COP) changes and stance asymmetry during long-duration quiet standing in individuals with hemiplegia secondary to stroke. A total of 10 stroke participants and 12 healthy controls stood on a level floor with eyes open for 120 seconds while their COP displacement, velocity, and loading forces were measured. Inter-limb stability was assessed using COP distance and velocity-dependent phase plane analysis.

The findings revealed significant asymmetry in COP measures, with greater values observed on the non-paretic side in the anterior-posterior direction among the stroke group. This indicated that the majority of weight bearing during the 120 seconds of quiet standing was imposed on the non-paretic side. The over-utilization of the non-paretic side may contribute to increased COP displacements, velocities, and potential postural instability in the anterior-posterior direction. However, the loading forces, COP range, root mean square (RMS) COP, and COP velocity medial-lateral (ML) ratios showed symmetry and were not significantly different from the healthy control group. These findings highlight the asymmetrical weight distribution and the compensatory "switching" strategy observed in individuals with hemiplegia post-stroke during quiet standing. Understanding these inter-limb differences and postural control patterns can contribute to the development of targeted interventions for improving balance and reducing the risk of falls in this population.

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