H Reflex Inhibition During Muscular Fatigue in Man

Olyaei, Gholamreza (1995) H Reflex Inhibition During Muscular Fatigue in Man. PhD thesis, University of Glasgow.

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Abstract

It is well known that the motoneurone firing rates associated with muscle fatigue are reduced during sustained voluntary contraction and it has been suggested that one reason for this decline might lie in reflex inhibition of motoneurone pools by muscle afferents sensitised by the fatiguing contraction. Garland and McComas (1990) demonstrated that fatigue of soleus causes a depression of its H reflex excitability. Soleus is difficult to fatigue and so the objective of the present study was to extend this work by examining the reflex effects of fatiguing contiactions in other muscles. The effects of fatiguing activity of the anterior tibial muscles on their own H reflex excitability and on the H reflex of their antagonist muscle, soleus also were examined. Alternatively quadriceps femoris muscle was fatigued to see how extensive the effect is. The main aim of this research was to determine the effects of fatiguing activity on the excitability of anterior tibial and soleus H reflexes. In addition, the differences between voluntary fatiguing activity and involuntary exercise by direct muscle stimulation were investigated. Experiments were performed on 50 neurologically normal subjects. Their ages ranged from 17 to 42 years. Subjects were seated in a semi-reclined position with their knee and ankle supported at 110

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Additional Information: Adviser: Ronald H Baxendale
Keywords: Neurosciences
Date of Award: 1995
Depositing User: Enlighten Team
Unique ID: glathesis:1995-75534
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 19 Nov 2019 19:32
Last Modified: 19 Nov 2019 19:32
URI: http://theses.gla.ac.uk/id/eprint/75534

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