H-REFLEX IN PATIENTS AFTER STROKES
Journal Title: Issues of Rehabilitation, Orthopaedics, Neurophysiology and Sport Promotion-IRONS - Year 2014, Vol 9, Issue 9
Abstract
Introduction. Ischemic stroke of a specified location within the centers of the motor cortex in the brain results in the isolation of the centers with motor neurons from the influences cells of origin of the corticospinal tract. The result of this is the phenomenon of increased muscle tension in clinical trials, resulting from an increased excitability of the spinal motor neurons. In studies of clinical neurophysiology, the manifestation is hyperreflexia of mono- or polysynaptic connections as well as the increase in the amplitude parameter of the sEMG recordings performed at rest with surface electrodes. Aim. The aim of this study was to investigate the activity of muscle motor units and transmission of nerve impulses in the motor fibers of the lower extremity nerves in patients after ischemic stroke on more paretic side (stroke-related). An additional aim of the study was to determine the parameters H-reflex recordings. Material and methods. In all of 5 examined patients, sEMG recordings parameters performed from the lower extremity muscles on more paretic side showed significant deficits in motor units activity. No significant changes of peripheral nerve impulses transmission in motor fibers were found. There were detected the significant changes in the H-reflex parameter of amplitude (increase compared to the standard values), while the latency parameter of this potential remained unchanged. Conclusion. The increase of the H-reflex amplitude can be explained by isolation the spinal motor centers out of cortical centers control and other supraspinal centers in patients with the ischemic stroke.
Authors and Affiliations
Juliusz Huber, Aleksandra Kulczyk, Joanna Lipiec, Agnieszka Szymankiewicz-Szukała
Keywords
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