Enhanced spinal excitation from ankle flexors to knee extensors during walking in stroke patients
| Autor: | Jens Nielsen, V. Achache, Véronique Marchand-Pauvert, A. Lackmy, Caroline Iglesias, R. Katz, Dominique Mazevet |
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| Rok vydání: | 2010 |
| Předmět: |
Adult
Male medicine.medical_specialty Stroke patient Movement Stimulation Walking Physical medicine and rehabilitation Physiology (medical) Humans Medicine Knee Muscle Skeletal Gait Stroke Aged Analysis of Variance Electromyography business.industry Peroneal Nerve Recovery of Function Middle Aged musculoskeletal system medicine.disease Electric Stimulation Sensory Systems Preferred walking speed medicine.anatomical_structure Spinal Cord Neurology Reflex Physical therapy Female Neurology (clinical) Ankle business human activities Common peroneal nerve |
| Zdroj: | Clinical Neurophysiology. 121:930-938 |
| ISSN: | 1388-2457 |
| DOI: | 10.1016/j.clinph.2009.12.037 |
| Popis: | Objectives It is still unclear to what an extent altered reflex activity contributes to gait deficit following stroke. Spinal group I and group II excitations from ankle dorsiflexors to knee extensors were investigated during post-stroke walking. Methods Electrical stimulation was applied to the common peroneal nerve (CPN) in the early stance, and the short-latency biphasic excitation in Quadriceps motoneurones was evaluated from the Vastus Lateralis (VL) rectified and averaged ( N =50) EMG activity in 14 stroke patients walking at 0.6–1.6km/h, and 14 control subjects walking at 3.2–4.8 and at 1km/h. Results The second peak of the CPN-induced biphasic facilitation in VL EMG activity, which is likely mediated by group II excitatory pathways, was larger on the paretic side of the patients, as compared to their nonparetic side or control subjects, whatever their walking speed. Conclusions The spinal, presumed group II, excitation from ankle dorsiflexors to knee extensors is particularly enhanced during post-stroke walking probably due to plastic adaptations in the descending control. Significance This adaptation may help to stabilize the knee in early stance when the patients have recover ankle dorsiflexor functions. |
| Databáze: | OpenAIRE |
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