Muscle weakness and lack of reflex gain adaptation predominate during post-stroke posture control of the wrist
| Autor: | Jurriaan H. de Groot, Frans C. T. van der Helm, Bob J. van Hilten, Erwin de Vlugt, Alfred C. Schouten, Hans J.H. Arendzen, Carel G. M. Meskers |
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| Přispěvatelé: | Rehabilitation medicine, Amsterdam Neuroscience - Neurovascular Disorders, Amsterdam Movement Sciences |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
musculoskeletal diseases
Adult Male Wrist Joint medicine.medical_specialty Movement disorders Neurology Posture Health Informatics Wrist medicine.disease_cause Models Biological lcsh:RC321-571 Weight-bearing Weight-Bearing Physical medicine and rehabilitation METIS-259090 Reflex medicine Humans lcsh:Neurosciences. Biological psychiatry. Neuropsychiatry Aged Feedback Physiological Muscle Weakness Reflex Abnormal Research Rehabilitation Stroke Rehabilitation Muscle weakness Middle Aged Adaptation Physiological Paresis Stroke medicine.anatomical_structure Torque Muscle Spasticity Joint stiffness Female medicine.symptom Psychology Psychomotor Performance Follow-Up Studies Muscle Contraction Muscle contraction |
| Zdroj: | Journal of NeuroEngineering and Rehabilitation, 6(1):29. BioMed Central Journal of NeuroEngineering and Rehabilitation Journal of NeuroEngineering and Rehabilitation 2009, 6 Journal of NeuroEngineering and Rehabilitation, Vol 6, Iss 1, p 29 (2009) Meskers, C G M, Schouten, A C, De Groot, J H, De Vlugt, E, Van Hilten, B J J, Van Der Helm, F C T & Arendzen, H J H 2009, ' Muscle weakness and lack of reflex gain adaptation predominate during post-stroke posture control of the wrist ', Journal of NeuroEngineering and Rehabilitation, vol. 6, no. 1, 29 . https://doi.org/10.1186/1743-0003-6-29 Journal of neuroengineering and rehabilitation, 6(29), 1-11. BioMed Central Ltd. Journal of NeuroEngineering and Rehabilition, 6 (29), 2009 |
| ISSN: | 1743-0003 |
| Popis: | Background Instead of hyper-reflexia as sole paradigm, post-stroke movement disorders are currently considered the result of a complex interplay between neuronal and muscular properties, modified by level of activity. We used a closed loop system identification technique to quantify individual contributors to wrist joint stiffness during an active posture task. Methods Continuous random torque perturbations applied to the wrist joint by a haptic manipulator had to be resisted maximally. Reflex provoking conditions were applied i.e. additional viscous loads and reduced perturbation signal bandwidth. Linear system identification and neuromuscular modeling were used to separate joint stiffness into the intrinsic resistance of the muscles including co-contraction and the reflex mediated contribution. Results Compared to an age and sex matched control group, patients showed an overall 50% drop in intrinsic elasticity while their reflexive contribution did not respond to provoking conditions. Patients showed an increased mechanical stability compared to control subjects. Conclusion Post stroke, we found active posture tasking to be dominated by: 1) muscle weakness and 2) lack of reflex adaptation. This adds to existing doubts on reflex blocking therapy as the sole paradigm to improve active task performance and draws attention to muscle strength and power recovery and the role of the inability to modulate reflexes in post stroke movement disorders. |
| Databáze: | OpenAIRE |
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