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Dependence of EMG Responses Evoked by Imposed Wrist Displacements on Pre-existing Activity in the Stretched Muscles

Published online by Cambridge University Press:  18 September 2015

W. Bedingham  and
W.G. Tatton
W. Bedingham*
Affiliation:
Departments of Neurology and Neurosurgery, and Radiology, McGill University and The Montreal General Hospital, Montreal
W.G. Tatton
Affiliation:
Departments of Neurology and Neurosurgery, and Radiology, McGill University and The Montreal General Hospital, Montreal
*
Playfair Neuroscience Unit, Toronto Western Hospital, 399 Bathurst Street, Toronto, Ontario M5T 2S8
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Abstract:

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The relationship between the segmented EMG activity in flexor carpi radialis evoked by imposed angular wrist displacement was studied with respect to the level of pre-existing background activity in 30 normal human subjects. Input-output response planes demonstrate that the magnitude of the Ml & M2-3 segments is dependent on both the displacement parameters and the level of pre-existing EMG activity in the stretched muscle. If the level of background activity exceeded 4-5% of the maximum voluntary contraction, the onset latency of the M1 segment and duration of the Ml and the M2-3 segments remained constant (within ± 2 msec) for different magnitudes of step load displacements, despite marked variation in the range of the displacement’s amplitude, duration, velocity, and acceleration. We propose that the dependency of the relationship between reflex magnitude and imposed movement parameters on tonic motoneuron activity, as represented by pre-existing EMG levels, may reflect an automatic adjustment mechanism that could be utilized in servo compensation of movements requiring markedly different force levels.

Type
Original Articles
Information
Canadian Journal of Neurological Sciences , Volume 11 , Issue 2 , May 1984 , pp. 272 - 280
Copyright
Copyright © Canadian Neurological Sciences Federation 1984

References

Allum, JHJ. (1976) Responses to load disturbance in human shoulder muscles: The hypothesis that one component is a pulse test information signal. Exp. Brain Res. 22: 307–326.Google Scholar
Bawa, P.Tatton, WG. (1979) Motor unit responses in muscles stretched by imposed displacements of monkey wrist. Exp. Brain Res. 37: 417–438.CrossRefGoogle ScholarPubMed
Cheney, PD.Fetz, EE. (1984) Primate cortical motoneuronal cells contribute to long latency stretch reflexes. J. Physiol., in press.CrossRefGoogle ScholarPubMed
Eklund, G.Hagbarth, KE., Hagglund, JV., Wallin, EU. (1982) Mechanical oscillations contributing to the segmentation of the reflex electromyogram response to stretching human muscles. J. Physiol. 326: 65–77.CrossRefGoogle Scholar
Ghez, C.Shinoda, Y. (1978) Spinal mechanisms of the functional stretch reflex. Exp. Brain Res. 32: 55–68.CrossRefGoogle ScholarPubMed
Gottlieb, GL.Agarwal, CG. (1979) Response to sudden torques about the ankle in man: Myotatic reflex. J. Neurophysiol. 42: 91–105.CrossRefGoogle ScholarPubMed
Hammond, PH. (1954) Involuntary activity in biceps following the sudden application of velocity to the abducted forearm. J. Physiol. (Lond.) 127: 17–18PGoogle Scholar
Hendrie, A.Lee, RG. (1978) Selective effects of vibration on human spinal and long-loop reflexes. Brain Res. 157: 369–375.CrossRefGoogle ScholarPubMed
Jaeger, RJ.Gottlieb, GL., Agarwal, GC. (1982a) Myoelectric responses at flexors and extensors of human wrist to step torque perturbations. J. Neurophysiol. 48: 388–402.CrossRefGoogle ScholarPubMed
Jaeger, RJ.Gottlieb, GL., Agarwal, GC., Tahmoush, AJ. (1982b) Afferent contributions to stretch-evoked myoelectric responses. J. Neurophysiol. 48: 403–418.CrossRefGoogle ScholarPubMed
Kwan, HC.Murphy, JT., Repeck, MW. (1979) Control of stiffness by medium latency electromyographic response to limb perturbation. Can. J. Physiol. Pharmacol. 57: 277–285.CrossRefGoogle Scholar
Lee, RG.Tatton, WG. (1982) Long latency reflexes to imposed displacements of the human wrist: Dependence on duration of movement. Exp. Brain Res. 45: 207–216.Google ScholarPubMed
Lenz, FA.Tatton, WG., Tasker, RR. (1983a) Electromyographic response to displacement of different forelimb joints in the squirrel monkey. J. Neurosci. 3: 783–794.CrossRefGoogle ScholarPubMed
Lenz, FA.Tatton, WG., Tasker, RR. (1983b) The effect of cortical lesions on the electromyographic response to joint displacement in the squirrel monkey forelimb. J. Neurosci. 3: 4, 795–805.CrossRefGoogle ScholarPubMed
Marsden, CD.Merton, PE., Morton, HB. (1972) Servo action in human voluntary movement. Nature (Lond.) 238: 140–143.CrossRefGoogle ScholarPubMed
Marsden, CD.Merton, PA., Morton, HB. (1976) Servo action in the human thumb. J. Physiol. 257: 1–44.CrossRefGoogle ScholarPubMed
Marsden, CD.Merton, PA., Morton, HB., Rothwell, JC., Traub, MM. (1981) Reliability and efficacy of the long-latency stretch reflex in the human thumb. J. Physiol. 316: 47–60.CrossRefGoogle ScholarPubMed
Melvill Jones, G., Watt, DGD. (1971) Observations on the control of stepping and hopping movements in man. J. Physiol. (Lond.) 219: 709–727.CrossRefGoogle Scholar
Miller, AD.Brooks, VB. (1981) Late muscular responses to arm perturbations persist during supraspinal dysfunctions in monkeys. Exp. Brain Res. 41: 146–158.CrossRefGoogle ScholarPubMed
Mortimer, JA.Johnson, MJ. (1976) Modification in monosynaptic and long-loop reflexes by movement tasks and preloads. In: International Symposium on Human Reflexes and Motor Disorders, (ed.) Desmedt, J.E., Brussels, pp. 131–132.Google Scholar
Phillips, CG. (1969) Motor apparatus of the baboon’s hand. The Ferrier Lecture, 1968. Proc. R. Soc. Lond. (Biol.) 173: 141–174.Google ScholarPubMed
Tatton, WG.Lee, RG. (1975) Evidence for abnormal long-loop reflexes Parkinsonian patients. Exp. Brain Res. 100: 671–676.CrossRefGoogle ScholarPubMed
Tatton, WG.Forner, SD., Gerstein, GL., Chambers, WW., Liu, CM. (1975). The effect of post-central lesions on motor responses to sudden upper limb displacement in monkeys. Brain Res. 96: 108–113.CrossRefGoogle Scholar
Tatton, WG.Bawa, P(1979) Input-output properties of motor unit responses in muscles stretched by imposed displacement of the monkey wrist. Exp. Brain Res. 37: 439–457.CrossRefGoogle ScholarPubMed
Tatton, WG.North, AGE., Bruce, IC., Bedingham, W. (1983) Electromyographic and motor cortical responses to imposed displacements of the cat elbow: disparities and homologies with those of the primate wrist. J. Neurosci. 3: 9, 1807–1817.CrossRefGoogle ScholarPubMed
Tatton, WG.Bedingham, W., Verrier, MC., Blair, RDG. (1984) Characteristic alterations in the responses to imposed wrist displacements in Parkinsonian rigidity and Dystonia Musculorum Deformans. (this issue)CrossRefGoogle ScholarPubMed
Wiesendanger, and Miles, (1982) Ascending pathway to low-threshold muscle afferents to the cerebral cortex and its possible role in motor control. Physiological Reviews. 62: 4, 1234–1270.CrossRefGoogle Scholar
Verrier, MC.Tatton, WG., Blair, RDG. (1984) Characteristics of EMG responses to imposed limb displacement in patients with vascular hemiplegia, (this issue)CrossRefGoogle ScholarPubMed