EFFECTS OF CHANGING IN HIP POSITION ON H - REFLEX EXCITABILITY IN HEALTHY SUBJECTS

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ALIAEI GHOLAM REZA; BAGHERI H.; TALEBIAN S.; HADIAN MOHAMMAD REZA; NAZARI P.

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Journal: KOWSAR MEDICAL JOURNAL Year:2001 | Volume:6 | Issue:part 2 Page(s): 81-90

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Title

EFFECTS OF CHANGING IN HIP POSITION ON H - REFLEX EXCITABILITY IN HEALTHY SUBJECTS

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Keywords

HOFFMANNS REFLEXQ3

HIP JOINT POSITIONQ4

FACILITATIONQ4

INHIBITIONQ4

PRESYNAPTIC INHIBITIONQ4

AFFERENT FIBERS.Q4

Abstract

The aim of this study was to assess the effects of hip position on H reflex amplitude. This study was carried on 30 healthy female subjects. Their ages ranged from 20 to 40 years. In this experiment, after placing the recording electrodes on the soleus muscle of the dominant leg, the lower limb from hip joint was randomly positioned in 150, 400 flexion, 200 abduction and 200 extension. H reflexes in five stages of stimulus intensity and maximum M wave (Mmax) were recorded by stimulation of tibial nerve in the popliteal fossa. In addition, latency of H reflexes in five stages, latency of maximum M wave and H/M ratio in four position were also recorded. In this study, knee joint was extended and ankle joint was fixed in 900 (neutral position) by a metal plate which was designed at the end of the bed. The lower limb, was also fixed by a sling in the femoral region. Paired t-test and ANOVA were used to determine significant differences between variables. Results were as follows: amplitude of H reflex in five stages of stimulus intensity and H/M ratio were decreased from 150 flexion (control position) to 400 flexion and increased from control position to 200 extension. In 200 abduction, amplitude of H reflex was decreased only in third, forth and fifth stages of experiment. H/M ratio was also decreased but not singnificantly. Amplitudes of Mmax werent differed in all positions which indicating test procedure were the same. The effects of hip position on H reflex amplitude and H/M ratio could explained by changing the activity of muscular and skin receptors and Golgi tendon organs and their effects on motor neuron pools. Positioning of the hip joint causes change in activity and excitability in motor neuron pools in spinal cord. These changes are due to genetic background and type of activity can decrease (inhibition) or increase (excitation) motor neuron activity in spinal cord.

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APA: Copy

ALIAEI, GHOLAM REZA, BAGHERI, H., TALEBIAN, S., HADIAN, MOHAMMAD REZA, & NAZARI, P.. (2001). EFFECTS OF CHANGING IN HIP POSITION ON H - REFLEX EXCITABILITY IN HEALTHY SUBJECTS. KOWSAR MEDICAL JOURNAL, 6(part 2), 81-90. SID. https://sid.ir/paper/32929/en

Vancouver: Copy

ALIAEI GHOLAM REZA, BAGHERI H., TALEBIAN S., HADIAN MOHAMMAD REZA, NAZARI P.. EFFECTS OF CHANGING IN HIP POSITION ON H - REFLEX EXCITABILITY IN HEALTHY SUBJECTS. KOWSAR MEDICAL JOURNAL[Internet]. 2001;6(part 2):81-90. Available from: https://sid.ir/paper/32929/en

IEEE: Copy

GHOLAM REZA ALIAEI, H. BAGHERI, S. TALEBIAN, MOHAMMAD REZA HADIAN, and P. NAZARI, “EFFECTS OF CHANGING IN HIP POSITION ON H - REFLEX EXCITABILITY IN HEALTHY SUBJECTS,” KOWSAR MEDICAL JOURNAL, vol. 6, no. part 2, pp. 81–90, 2001, [Online]. Available: https://sid.ir/paper/32929/en

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