| Titre : | Modification of Spastic Stretch Reflexes at the Elbow by Flexion Synergy Expression in Individuals With Chronic Hemiparetic Stroke (2018) |
| Auteurs : | Jacob G. McPherson ; Arno H. Stienen ; Justin M. Drogos |
| Type de document : | Article |
| Dans : | Archives of Physical Medicine and Rehabilitation (Vol. 99, n° 3, 2018) |
| Article en page(s) : | p. 491-500 |
| Langues: | Anglais |
| Descripteurs : |
HE Vinci Accident vasculaire cérébral (AVC) ; Rééducation et réadaptation ; Robotique |
| Mots-clés: | Motor disorders ; Troubles moteurs ; Muscle spasticity ; Spasticité musculaire ; Neurological rehabilitation ; Rééducation neurologique ; Robotics ; Stroke |
| Résumé : |
Objective To systematically characterize the effect of flexion synergy expression on the manifestation of elbow flexor stretch reflexes poststroke, and to relate these findings to elbow flexor stretch reflexes in individuals without neurologic injury. Design Controlled cohort study. Setting Academic medical center. Participants Participants (N=20) included individuals with chronic hemiparetic stroke (n=10) and a convenience sample of individuals without neurologic or musculoskeletal injury (n=10). Interventions Participants with stroke were interfaced with a robotic device that precisely manipulated flexion synergy expression (by regulating shoulder abduction loading) while delivering controlled elbow extension perturbations over a wide range of velocities. This device was also used to elicit elbow flexor stretch reflexes during volitional elbow flexor activation, both in the cohort of individuals with stroke and in a control cohort. In both cases, the amplitude of volitional elbow flexor preactivation was matched to that generated involuntarily during flexion synergy expression. Main Outcome Measures The amplitude of short- and long-latency stretch reflexes in the biceps brachii, assessed by electromyography, and expressed as a function of background muscle activation and stretch velocity. Results Increased shoulder abduction loading potentiated elbow flexor stretch reflexes via flexion synergy expression in the paretic arm. Compared with stretch reflexes in individuals without neurologic injury, paretic reflexes were larger at rest but were approximately equal to control muscles at matched levels of preactivation. Conclusions Because flexion synergy expression modifies stretch reflexes in involved muscles, interventions that reduce flexion synergy expression may confer the added benefit of reducing spasticity during functional use of the arm. |
| Disponible en ligne : | Oui |
| En ligne : | https://login.ezproxy.vinci.be/login?url=https://www.sciencedirect.com/science/article/pii/S0003999317304859 |
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