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http://dx.doi.org/10.5762/KAIS.2011.12.11.5019

Effect of the increased sympathetic outflow on the changes of muscle tone and central nervous system excitability in chronic stroke patients  

Kang, Byeong-Kil (Dept. of Rehabilitation Medicine, Presbyterian Medical Center)
Nam, Ki-Won (Dept. of Physical Therapy, Dongshin University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.12, no.11, 2011 , pp. 5019-5026 More about this Journal
Abstract
The purpose of this study was to investigate the effect of the increased sympathetic outflow on the changes of muscle tone and central nervous system excitability in the chronic stroke patients. This study was conducted from October 12th 2009 to December 4th 2009. 30 patients with chronic hemiplegia for at least 6 months were participated. Before and during the mental arithmetic, static handgrip and post-handgrip ischemia tasks, the central nervous system action potentials and global synkinesis level were compared. The central nerve action potentials were measured with H/Mmax ratio and V/Mmax ratio. To obtain global synkinesis level, surface electromyography data were digitized, processed to root mean square. In our study, The global synkinesis level during knee flexion and extension was decreased in the mental arithmetic and in the post-handgrip ischemia task(p<.05) but not in the grip task. Also, V/Mmax ratio was decreased all in the three task(p<.05). In conclusion, we know that the central nervous system excitability and the muscle tone in chronic hemiplegic patients were decreased by the increased sympathetic outflow.
Keywords
Chronic stroke; Muscle tone; Central nerve system excitability; Sympathetic outflow;
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