ASSESSING INFORMATION OF SOLEUS AND GASTROCNEMIUS MOTOR UNITH-REFLEX RESPONSE TO PAIRED STIMULATION

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SARMADI A.R.; FIROUZABADI S.M.; TORKAMAAN G.; FATH ELAHI Y.

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Journal: Pathobiology Research Year:2005 | Volume:7 | Issue:2 Page(s): 59-70

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Title

ASSESSING INFORMATION OF SOLEUS AND GASTROCNEMIUS MOTOR UNITH-REFLEX RESPONSE TO PAIRED STIMULATION

Author(s)

SARMADI A.R. | FIROUZABADI S.M. | TORKAMAAN G. | FATH ELAHI Y. | Issue Writer Certificate

Keywords

H-REFLEXQ4

PAIRED STIMULATIONQ4

GASTROCNEMIUSQ3

MOTONEURONQ3

FATIGABILITYQ3

Abstract

Purpose: In this study we compared soleus and GASTROCNEMIUS responses to the PAIRED STIMULATION in order to reveal embedded information in the H- reflex of these muscles.Materials and Method: Four men with ages between 20 and 26 were tested. Because there was no ideal point based on the scientific rules to record the H-REFLEX from the GASTROCNEMIUS, we were to determine an ideal point and electrode placement from anatomical and physiological point of view. After this step, the soleus and GASTROCNEMIUS were subjected to the paired stimulus and we record the H-REFLEX recovery curve of these muscles. To record the recovery curve, 11 pairs of stimulus were delivered to the posterior tibial nerve. The time interval between the 1st pair of the stimulus was 50 ms and was increased by 20 ms steps in the next pairs up to 250 ms. Relation of the second H-REFLEX amplitude to the first was calculated and expressed in percent. Then we draw the recovery curve using these values.Result and discussion: While the time interval of the paired stimulus was less than 110 ms, the behavior of the curves were similar. In this stage we guess that the muscles are impressed by the renshaw cells inhibition and the fatigue is induced by the first stimulus. When the interval of a pair was 110 ms or more the recovery of soleus was significantly higher than the GASTROCNEMIUS. This behavior may be due to a lesser FATIGABILITY of the soleus MOTONEURONs and a less renshaw inhibition on the slow MOTONEURONs of the soleus. When the time interval of a pair stimulus was increase1 to more than 170ms, both of the curves behave alike. The cause may be the diminishing of the renshaw cell inhibition and the reduction of the fatigue.Conclusion: Because of the physiological properties of MOTONEURONs, when we excite the H-REFLEX, smaller MOTONEURONs recruite predominantly; but comparing the soleus (slow) and GASTROCNEMIUS (fast) recovery curve behavior shows that the information of the fast MOTONEURON is included in the H-REFLEX. Using this procedure, we can assess different MOTONEURON and renshaw cell activities, indirectly. Of course this needs more controlled studies.

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References

جایگاه هندسه الکترود سطحی در برداشت و پردازش سیگنال EMG

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APA: Copy

SARMADI, A.R., FIROUZABADI, S.M., TORKAMAAN, G., & FATH ELAHI, Y.. (2005). ASSESSING INFORMATION OF SOLEUS AND GASTROCNEMIUS MOTOR UNITH-REFLEX RESPONSE TO PAIRED STIMULATION . PATHOBIOLOGY RESEARCH (MODARES JOURNAL OF MEDICAL SCIENCES), 7(2), 59-70. SID. https://sid.ir/paper/81156/en

Vancouver: Copy

SARMADI A.R., FIROUZABADI S.M., TORKAMAAN G., FATH ELAHI Y.. ASSESSING INFORMATION OF SOLEUS AND GASTROCNEMIUS MOTOR UNITH-REFLEX RESPONSE TO PAIRED STIMULATION . PATHOBIOLOGY RESEARCH (MODARES JOURNAL OF MEDICAL SCIENCES)[Internet]. 2005;7(2):59-70. Available from: https://sid.ir/paper/81156/en

IEEE: Copy

A.R. SARMADI, S.M. FIROUZABADI, G. TORKAMAAN, and Y. FATH ELAHI, “ASSESSING INFORMATION OF SOLEUS AND GASTROCNEMIUS MOTOR UNITH-REFLEX RESPONSE TO PAIRED STIMULATION ,” PATHOBIOLOGY RESEARCH (MODARES JOURNAL OF MEDICAL SCIENCES), vol. 7, no. 2, pp. 59–70, 2005, [Online]. Available: https://sid.ir/paper/81156/en

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