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ORIGINAL ARTICLE   Open accessopen access

European Journal of Physical and Rehabilitation Medicine 2022 October;58(5):693-700

DOI: 10.23736/S1973-9087.22.07539-6

Copyright © 2022 THE AUTHORS

This is an open access article distributed under the terms of the CC BY-NC-ND 4.0 license which allows users to copy and distribute the manuscript, as long as this is not done for commercial purposes and further does not permit distribution of the manuscript if it is changed or edited in any way, and as long as the user gives appropriate credits to the original author(s) and the source (with a link to the formal publication through the relevant DOI) and provides a link to the license.

language: English

Effects of asymmetrical support on lower limb muscle activity during Lokomat guided gait in persons with a chronic stroke: an explorative study

Sylvana MINKES-WEILAND 1, 2 , Heleen A. REINDERS-MESSELINK 2, 3, Anne M. BOONSTRA 2, Lucas H. van der WOUDE 1, 3, 4, Rob den OTTER 1

1 Department of Human Movement Sciences, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands; 2 “Revalidatie Friesland” Rehabilitation Center, Beetsterzwaag, the Netherlands; 3 University Medical Center Groningen, Center for Rehabilitation, University of Groningen, Groningen, the Netherlands; 4 Peter Harrison Centre for Disability Sport, School of Sport Exercise and Health Sciences, Loughborough University, Loughborough, UK

BACKGROUND: The Lokomat, one of the most popular robotic exoskeletons, can take the asymmetry in the gait pattern of unilaterally affected patients into account with its opportunity to provide unequal levels of movement support (or ‘guidance’) to each of the legs. This asymmetrical guidance may be used to selectively unburden limbs with impaired voluntary control and/or to exploit the interlimb couplings for training purposes. However, there is a need to explore and understand these specific device opportunities more broadly before implementing them in training.
AIM: The aim of this study was to explore the effects of (a)symmetrical guidance settings on lower limb muscle activity in persons with post stroke hemiparesis, during Lokomat guided gait.
DESIGN: A single group, dependent factorial design.
SETTING: Rehabilitation center; a single session of Lokomat guided walking.
POPULATION: A group of ten persons with post stroke hemiparesis.
METHODS: Participants walked in the Lokomat in eight conditions, consisting of symmetrical and asymmetrical guidance situations, at both 0.28 m/s and 0.56 m/s. During symmetrical conditions, both legs received 30% or 100% guidance, while during asymmetrical conditions one leg received 30% and the other leg 100% guidance. Surface electromyography was bilaterally measured from: Biceps Femoris, Rectus Femoris, Vastus Medialis, Medial Gastrocnemius and Tibialis Anterior. Statistical effects were assessed using Statistical Parametric Mapping.
RESULTS: The provision of assymetrical guidance did not affect the level of lower limb muscle activity. In addition, no effect (except for Vastus Medialis in the affected leg during 1.5-2.4% of the gait cycle) of symmetrical guidance on muscle amplitude could be observed.
CONCLUSIONS: The results show no evidence that either symmetrical or asymmetrical guidance settings provided by the Lokomat can be used to manipulate activity of lower limb musculature in persons with post stroke hemiparesis.
CLINICAL REHABILITATION IMPACT: This study provides insights for the use of specific opportunities provided by the Lokomat for training purposes post stroke.

KEY WORDS: Exoskeleton device; Electromyography; Locomotion; Rehabilitation

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