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Effect of Knee Joint Angle on a Heteronymous lb Reflex in the Human Lower Limb

Published online by Cambridge University Press:  18 September 2015

J.D. Brooke  and
W.E. Mcllroy
J.D. Brooke*
Affiliation:
Neurophysiology Laboratory, Biophysics Interdepartmental Group and School of Human Biology, College of Biological Science, University of Guelph, Guelph
W.E. Mcllroy
Affiliation:
Neurophysiology Laboratory, Biophysics Interdepartmental Group and School of Human Biology, College of Biological Science, University of Guelph, Guelph
*
Neurophysiology Laboratory, College of Biological Science, University of Guelph, Guelph, Ontario, Canada N1G 2W1
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Abstract:

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Altered efficacy, from change in receptor discharge with different positions of the knee, was investigated in a heteronymous lb reflex of the human leg. The electrical stimulus was low threshold, to the common peroneal nerve. The divergence of the group I afferents was studied in the electromyograms (EMGs) of ipsilateral and contralateral thigh muscles. The stimulus evoked ipsilateral, short latency, excitation in the three quadriceps muscles studied and inhibition in the knee flexor semitendinosus (ST), with prior contraction of target muscles. This excitation and inhibition did not alter when studied over the range of the knee joint. The stimulus did not evoke responses in contralateral thigh muscles, contracted or relaxed. It is concluded that (1) any change in convergence from discharge of receptors, during extension of the limb, is small and sub-threshold, and (2) this spinal proprioceptive level of neural control appears to be directed primarily to the single limb.

Type
Original Articles
Information
Canadian Journal of Neurological Sciences , Volume 16 , Issue 1 , February 1989 , pp. 58 - 62
Copyright
Copyright © Canadian Neurological Sciences Federation 1989

References

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