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Titre : | Effect of Antispastic Drugs on Motor Reflexes and Voluntary Muscle Contraction in Incomplete Spinal Cord Injury (2014) |
Auteurs : | Virginia Way Tong Chu ; Thomas George Hornby ; Brian David Schmit |
Type de document : | Article |
Dans : | Archives of Physical Medicine and Rehabilitation (2014/4, 2014) |
Article en page(s) : | p. 622-632 |
Langues: | Anglais |
Descripteurs : |
HE Vinci Force musculaire ; Rééducation et réadaptation ; Traumatismes de la moelle épinière |
Mots-clés: | Muscle spasticity ; Spasticité musculaire ; Muscle strength ; Reflex ; stretch ; Réflexe d'étirement ; Spinal cord injuries |
Résumé : |
Objective To investigate the effects of antispastic drugs baclofen and tizanidine on reflexes and volitional tasks. Design Double-blind, placebo-controlled, crossover, before-after trial, pilot study. Setting Research laboratory in a rehabilitation hospital. Participants Men with chronic (>6mo) motor incomplete spinal cord injury (N=10) were recruited for the study. Interventions Tizanidine, baclofen, and placebo were tested in this study. Agents were tested in separate experimental sessions separated by >1 week. Main Outcome Measures Reflex and strength were measured before and after the administration of a single dose of each intervention agent. Electromyographic and joint torque data were collected during assessments of plantar flexor stretch reflexes, maximum contraction during motor-assisted isokinetic movements, and maximum isometric knee extension and flexion. Results Reduced stretch reflex activity was observed after the administration of either tizanidine or baclofen. We observed that tizanidine had a stronger inhibitory effect on knee extensors and plantar flexors whereas baclofen had a stronger inhibitory effect on the knee flexors. The effects of these drugs on strength during isometric and isokinetic tasks varied across participants, without a consistent reduction in torque output despite decreased electromyographic activity. Conclusions These results suggest that antispastic drugs are effective in reducing stretch reflexes without substantially reducing volitional torque. Differential effects of tizanidine and baclofen on reflexes of flexors and extensors warrant further investigation into patient-specific management of antispastic drugs. |
Disponible en ligne : | Oui |
En ligne : | https://login.ezproxy.vinci.be/login?url=https://www.sciencedirect.com/science/article/pii/S0003999313011532 |