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Changes in the H Reflex Preceding Voluntary Movements of the Contralateral Lower Limb in Humans

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In electromyographic studies on healthy subjects, we recorded the H reflex from the right m. soleus and measured changes in the magnitude of this reflex response related to voluntary movements of the contralateral lower limb performed according to a visual signal. The effects of back and plantar flexions of the contralateral foot of the tested subject in the lying and standing positions were examined. Changes in the H reflex magnitude began to be recorded 60 to 90 msec prior to voluntary movements of the contralateral limb. When the subject was in the lying position, these changes looked like facilitation of the H reflex at both types of movement of the contralateral foot. When the subject stood, facilitation preceded back flexion of the foot of this extremity, while plantar flexion was preceded by inhibition of the tested H reflex. Our results show that the pattern of preliminary changes in the muscle tone of one of the lower limbs is determined by the type of future movement of another limb and peculiarities of the support function realized by this limb.

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Authors and Affiliations

  1. Zaporozh’ye State Medical University, Zaporozh’ye, Ukraine

    E. Z. Ivanchenko & É. I. Slivko

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  1. E. Z. Ivanchenko
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  2. É. I. Slivko
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Correspondence to É. I. Slivko.

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Neirofiziologya/Neurophysiology, Vol. 43, No. 2, pp. 146–152, 2011

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Ivanchenko, E.Z., Slivko, É.I. Changes in the H Reflex Preceding Voluntary Movements of the Contralateral Lower Limb in Humans. Neurophysiology 43, 124–130 (2011). https://doi.org/10.1007/s11062-011-9199-z

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  • DOI: https://doi.org/10.1007/s11062-011-9199-z

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