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H reflex during pasive movements
Borský, Ondřej ; Otáhal, Jakub (advisor) ; Michalec, Radim (referee)
Title: Motoneuron excitability depending on the level of muscle stretch Aim: The aim of this thesis is to evaluate if passive muscle lenght change may influence parameters of H - reflex of soleus muscle Method: Tibial nerve stimulation in the fossa poplitea area was performed on 6 persons while passive stretching or lengthening of the muscle. Action potentials were captured on soleus muscle. Stimulation was performed in three different time periods - 4s, 2s, 1s. Each period was performed twice. First in passive muscle stretching then the passive shortening. The Hmax and Mmax values during passive muscle stretching and shortening were evaluated and compared. Results: The measurment results showed that there was a significant decrease in the Hmax values during passive muscle stretching. Mmax values were evaluated as passive muscle length change independent. Keywords: EMG, recruitment curve, H-reflex, M-wave, m.soleus, excitability
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Recruitment curve of H reflex in diagnostics of pseudoradicular syndrom
Vocilka, Jindřich ; Otáhal, Jakub (advisor) ; Šifta, Petr (referee)
Title: Recruitment curve of H-reflex in diagnostics of non-radicular syndroms Objectives: The main objective of this work is to verify the conductivity of nerve structures examination recruitment curves H-reflex and M-wave in the EMG examination in probands with non-radicular syndrome L5/S1. Methods: We tested 12 probands clinical trial diagnosed with non-radicular syndrome L5/S1. The test sample was compared with an equally large group of control probands. H-reflex of m.soleus was examined by bipolar stimulation in the fossa poplitea of tibial nerve. The results of an electromyographic examination was evaluated to asymptomatic and symptomatic side. Amplitude of H-reflex and M-wave, slope of recruitment curve, peaks of recruitment curves for the H-reflex and M-wave and the ratio Hmax / Mmax were evaluated and statistically compared. Results: Results of non-radicular syndrome L5/S1showed no significant change in the H-reflex. Due to this result we can suggests that there is no damage in nerve fibres in patients with non-radicular syndrome. Keywords: non-radicular syndrome, H-reflex, M-wave, recruitment curve
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Consequences of forced hypokinesia on human movement apparatus
Kadlecová, Jana ; Jelen, Karel (advisor) ; Otáhal, Jakub (referee)
Title: Consequences of forced hypokinesia on human movement aparatus. Objectives: The aim of this study was to find out the influence of forced hypokinesia after total hip replacement on the excitability of α motoneurons. I deal with the changes of H-reflex and M-wave latencies and the changes of the recruitment curves. The results of the operated and non-operated (kontrol) lower limb were compared. Methods: Five volunteers 3 - 4 weeks after total hip replacement participated in this study. The age was 62,4 (± 3,01). The H-reflex was elicited by stimulation of tibial nerve in a poplitel fossa. The H-reflex and M-wave latencies and its recruitment curves were obtained. After that the values of the operated lower limb were compared with the non-operated one (control). The results were evaluated as case studies. The EMG device Grass Telefactor was used to detect the electrical potential of soleus muscle. The rectangular pulses of 0,5 ms duration were used for stimulation tibial nerve by Grass 88 Stimulator. Then the data were transduced by CED Power 1401 device. Results: We found out that the H-reflexes of both lower limbs were not elicited in the case study no. 2 and the H-reflex of a control lower limb was not elicited in case study no. 1. The stimulus intensities for eliciting H-reflex and M-wave...
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H reflex during pasive movements
Borský, Ondřej ; Otáhal, Jakub (advisor) ; Michalec, Radim (referee)
Title: Motoneuron excitability depending on the level of muscle stretch Aim: The aim of this thesis is to evaluate if passive muscle lenght change may influence parameters of H - reflex of soleus muscle Method: Tibial nerve stimulation in the fossa poplitea area was performed on 6 persons while passive stretching or lengthening of the muscle. Action potentials were captured on soleus muscle. Stimulation was performed in three different time periods - 4s, 2s, 1s. Each period was performed twice. First in passive muscle stretching then the passive shortening. The Hmax and Mmax values during passive muscle stretching and shortening were evaluated and compared. Results: The measurment results showed that there was a significant decrease in the Hmax values during passive muscle stretching. Mmax values were evaluated as passive muscle length change independent. Keywords: EMG, recruitment curve, H-reflex, M-wave, m.soleus, excitability
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