The quantitative differences among individuals in the natural reciprocal inhibition of the soleus H-reflex during dorsiflexion were examined, in conjunction with the maximal H-reflex as the test reflex size in each individual. Maximal H-reflex was expressed relative to the maximal M-response (Hmax) when compared among individuals. Analysis showed that with increases in Hmax at rest in each individual, the inhibitory effect was first enhanced, then reached a peak, and was finally alleviated. This pattern was similar to the intraindividual pattern of the inhibitory effect induced by specific conditioning stimulus as a function of the test reflex size.
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References
1.
CasabonaA.PolizziM.PerciavalleV. (1990) Difference in H-reflex between athletes trained for explosive contractions and non-trained subjects. European Journal of Applied Physiology and Occupational Physiology, 61, 26–32.
2.
CroneC. (1993) Reciprocal inhibition in man. Danish Medical Bulletin, 40, 571–581.
3.
CroneC.HultbornH.MazièresL.MorinC.NielsenJ.Pierrot-DeseillignyE. (1990) Sensitivity of monosynaptic test reflex to facilitation and inhibition as a function of the test reflex size: a study in man and the cat. Experimental Brain Research, 81, 35–45.
4.
CroneC.NielsenJ. (1989) Spinal mechanisms in man contributing to reciprocal inhibition during voluntary dorsiflexion of the foot. Journal of Physiology, 416, 255–272.
5.
FournierE.MeunierS.Pierrot-DeseillignyE.ShindoM. (1986) Evidence for interneuronally mediated Ia excitatory effects to human quadriceps motoneurones. Journal of Physiology, 377, 143–169.
6.
FunaseK.ImanakaK.NishihiraY. (1994) Excitability of the soleus motoneuron pool revealed by the developmental slope of the H-reflex as reflex gain. Electromyography and Clinical Neurophysiology, 34, 477–489.
7.
FunaseK.ImanakaK.NishihiraY.ArakiH. (1994) Threshold of the soleus muscle H-reflex is less sensitive to the change in excitability of the motoneuron pool during plantarflexion or dorsiflexion in humans. European Journal of Applied Physiology and Occupational Physiology, 69, 21–25.
8.
KayserB.BökenkampR.BinzoniT. (1993) Alpha-motoneuron excitability at high altitude. European Journal of Applied Physiology and Occupational Physiology, 66, 1–4.
9.
MeinckH. (1980) Facilitation and inhibition of the human H-reflex as a function of the amplitude of the control reflex. Electroencephalography and Clinical Neurophysiology, 48, 203–211.
10.
MilanovI. (1992) A comparative study of methods for estimation of presynaptic inhibition. Journal of Neurology, 239, 287–292.
11.
NielsenJ.CroneC.HultbornH. (1993) H-reflex is smaller in dancers from The Royal Danish Ballet than well-trained athletes. European Journal of Applied Physiology and Occupational Physiology, 66, 116–121.
12.
SchieppatiM. (1987) The Hoffmann reflex: a means of assessing spinal reflex excitability and its descending control in man. Progress in Neurobiology, 28, 345–376.
13.
TaborikovaH.SaxD. S. (1968) Motoneuron pool and the H-reflex. Journal of Neurology, Neurosurgery and Psychiatry, 31, 354–361.
