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:: Volume 9, Number 4 (11-2015) ::
mrj 2015, 9(4): 54-67 Back to browse issues page
The anesthesia effect of vertebral column skin receptors on the motoneuron excitability and H-reflex recovery in Soleus and Gastrocnemius muscles
Yasamin Khoshamooz1, Giti Torkaman 2, Hajar Bani fatemeh1, Alireza Sarmadi3
1- MSc in.Physiotherapy ,Faculty of medical Sciences, Tarbiat Modares University, Tehran,Iran
2- Full Professor,Department of Physiotherapy, Faculty of medical Sciences, Tarbiat Modares University, Tehran, Iran. , torkamg@modares.ac.ir
3- PhD in Physiotherapy, Faculty of medical Sciences, Tarbiat Modares University.
Abstract:   (1947 Views)

Background and Aim: There are many disputes concerning the role of skin receptors on excitability of spinal motoneurons. The purpose of the present study is to evaluate the motoneuron excitability and H-reflex recovery curve of Soleus and Gastrocnemius muscles after application of local anesthesia on the skin of vertebral column.

Materials and Methods: Thirty healthy non-athlete female volunteers with a mean age of 27.20 ± 3.11 years old, were tested in two separated sessions. The H-reflex recovery curve of Soleus and Gastrocnemius were recorded before intervention and 15 minutes after the application of anesthesia (lidocaine 10%) or placebo anesthesia (water), with two excitation intensity of 30% and 100% of Hmax and interval interpulses of 1-202 ms. After extraction the amplitude of H1 and H2 response and fitting the recovery curve their amplitude and interval of the peak, area under the curve and, thresholds of the early and secondary facilitation were calculated and analyzed.

Results: After application of lidocaine, the sensory threshold of the vertebral column skin increased significantly. Due to a significant increase in H1 amplitude, peak, and area under the curve of the early facilitation showed a significant decrease (p<0.05). Threshold of the secondary facilitation showed a significant decrease in the Gastrocnemius and Soleus muscles (p<0.05).

Conclusion: The results suggest that decrease of skin receptors activity after anesthesia can facilitate motoneurons excitability and H-reflex recovery. It seems that using the method of paired stimulation and H-reflex recovery curve may be useful to investigate the effect of physical therapy modalities on the fast and slow motoneuron excitability.

Keywords: H-reflex recovery curve, Local anesthesia, Cooling, Motoneuron excitability.

Keywords: H-reflex recovery curve, Local anesthesia, Cooling, Motoneuron excitability
Full-Text [PDF 529 kb]   (556 Downloads)    
Type of Study: Research | Subject: Special
Received: 2015/10/31 | Accepted: 2015/10/31 | Published: 2015/10/31
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Khoshamooz Y, Torkaman G, Bani fatemeh H, Sarmadi A. The anesthesia effect of vertebral column skin receptors on the motoneuron excitability and H-reflex recovery in Soleus and Gastrocnemius muscles. mrj. 2015; 9 (4) :54-67
URL: http://mrj.tums.ac.ir/article-1-5353-en.html
Volume 9, Number 4 (11-2015) Back to browse issues page
فصلنامه توانبخشی نوین Journal of Modern Rehabilitation
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