Cited by 12Muscle activation and electromyography studiesMotor Control and AdaptationPain Mechanisms and Treatments

Movement modulation of a short latency reflex linking the lower leg and the knee extensor muscles in humans

Brooke, J.D., McIlroy, W.E.·1990·Electroencephalography and Clinical Neurophysiology

Abstract

Movement modulation of a heteronymous short latency spinal reflex was investigated with transcutaneous, low threshold, stimuli to the common peroneal nerve, during leg pedalling in humans. Electromyographic (EMG) electrodes on the skin over the quadriceps muscles revealed an excitatory response at a minimum latency of 22.8 msec. Samples were obtained at 5 phases in the cycle of pedal crank rotation, and for stimulus intensities to evoke both maximal, and submaximal, reflexes in quadriceps. Over the pedal cycle, the peak-to-peak magnitude of the reflex, in the 3 quadriceps muscles studied, was deeply modulated, including an areflexive phase. The reflex magnitude was linearly dependent on the ongoing EMG activity in quadriceps. It could be fully re-initiated if contractions were produced out of phase in pedalling. The slopes of the regression lines of reflex magnitude (as % maximum reflex) on contraction level (% maximum voluntary contraction) when pedalling (1.05 (r = 0.86, P less than 0.01], and with isometric contractions in the same subjects seated (1.03 (r = 0.69, P less than 0.01], were very similar, with similar thresholds. This contrasts with the inhibition of soleus H reflexes during human gait. The present heteronymous reflex, acting between limb segments, is modulated coincident with ongoing contraction level in the target muscle.

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Crossref · 10.1016/0013-4694(90)90153-b

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Authors
Brooke, J. D., & McIlroy, W. E.
Affiliations
University of Guelph (CA)
Corresponding author
Brooke, J.D.
Venue
Electroencephalography and Clinical Neurophysiology
Publisher
Elsevier BV
Published
1990-02
Volume
75
Issue
1-2
Pages
64-74
ISSN
0013-4694 (ISSN-L)
OpenAlex
W2076141177
Cited by
12
References
37
Citations by year
2022: 1 · 2020: 1
FWCI
1.90
Type
journal article
Language
en
Open access
closed
Locations
  • Electroencephalography and Clinical Neurophysiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
Natural Sciences and Engineering Research Council of Canada
Topics
  • Physical Sciences › Engineering › Biomedical Engineering › Muscle activation and electromyography studies
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Motor Control and Adaptation
  • Health Sciences › Medicine › Physiology › Pain Mechanisms and Treatments
Keywords
short-latency reflex, quadriceps, peroneal nerve, reflex inhibition, knee extensors, isometric contraction, reflex threshold
MeSH terms
Adult, Electromyography, Humans, Knee, Leg, Movement, Muscles, Neural Pathways, Reaction Time, Reflex

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