Application of the ${\rm F}$-Response for Estimating Motor Unit Number and Amplitude Distribution in Hand Muscles of Stroke Survivors

Li, Xiaoyan; Fisher, Morris A.; Rymer, William Z.; Zhou, Ping

doi:10.1109/tnsre.2015.2453274

Cited by 25 publications

(23 citation statements)

References 46 publications

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“…Decrease of CMAP amplitude in the paretic side was observed in the study, though statistical analysis did not show any significant difference between the paretic and contralateral sides. The results are slightly different from previous studies in stroke ( 33 , 34 ). In the chronic stroke, CMAP amplitude can be partially compensated by collateral sprouting of the denervated muscle fibers ( 35 , 36 ).…”

Section: Discussioncontrasting

confidence: 99%

Assessing Hand Muscle Structural Modifications in Chronic Stroke

et al. 2018

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The purpose of the study is to assess poststroke muscle structural alterations by examining muscular electrical conductivity and inherent electrophysiological properties. In particular, muscle impedance and compound muscle action potentials (CMAP) were measured from the hypothenar muscle bilaterally using the electrical impedance myography and the electrophysiological techniques, respectively. Significant changes of muscle impedance were observed in the paretic muscle compared with the contralateral side (resistance: paretic: 27.54 ± 0.97 Ω, contralateral: 25.46 ± 0.91 Ω, p < 0.05; phase angle: paretic: 8.81 ± 0.61°, contralateral: 10.79 ± 0.69°, p < 0.05). In addition, impedance changes correlated moderately with the CMAP amplitude in the paretic hand (phase angle: r = 0.66, p < 0.05; reactance: r = 0.58, p < 0.05). The study discloses significant muscle rearrangements as a result of fiber loss or atrophy, fat infiltration or impaired membrane integrity in chronic stroke.

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Section: Discussioncontrasting

confidence: 99%

Assessing Hand Muscle Structural Modifications in Chronic Stroke

et al. 2018

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“…F-waves only measure a small portion of the motor unit pool tested by antidromically activating some of the alpha-motor neurons [12]. The amplitude of the F-wave is the overall excitability index of the measurement of the motor neuron pool [13]. F-wave can be used to measure the functional status of the entire motor pathway and to determine its velocity, which is the elapsed time between a stimulus artefact and the rst F-wave.…”

Section: Discussionmentioning

confidence: 99%

WITHDRAWN: Changes of the F-wave in the acute phase of permanent spinal cord ischaemic injury predict spinal cord function in animal models of rabbits

Zhou

Liu

Heng

et al. 2020

Preprint

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Background ：To explore the changes of the F-wave in the posterior tibial nerve of rabbits after different levels of lumbar spinal cord ischaemic injury and its correlation with motor function and the extent of lumbar spinal cord pathological damage. Methods ： Thirty New Zealand rabbits were randomly divided into 6 groups. The control group (n=5) was used to exclude the influence of anaesthesia and surgery on the F-wave. Different levels of lumbar arteries were ligated in the five experimental groups (n=5). The F-wave was recorded to observe the changes in the acute phase of spinal cord ischaemia.The correlation between the changes of the F-wave in the acute reversible phase and the motor function of the spinal cord was analysed. Results ： The results for the control group indicated that anaesthesia and surgery did not affect the F-wave results.There was no statistically significant difference in the F-wave amplitudes and latency before and after ligation in the 1 and 2 level ligation groups. The F-wave changed immediately after ligation in the 3, 4 and 5 ligation groups. The latency of the F-wave gradually extended, the amplitude of the F-wave gradually reduced.The amplitude variations of the F-wave were positively correlated with the motor function 2 days after ligation, there was a statistically significant difference. Conclusion ：The F-waves in the posterior tibial nerve of rabbits were found to be sensitive to the lumbar spinal cord ischaemic injury and specific to predict motor function.

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“…Muscle structural changes may occur after a cerebral lesion as a consequence of disrupted synaptic inputs to the motor neurons [1], [5]–[7]. The typical process includes muscle denervation followed by motor axonal sprouting and collateral reinnervation [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Electrical Impedance Myography for Evaluating Paretic Muscle Changes After Stroke

Shin

et al. 2017

IEEE Trans. Neural Syst. Rehabil. Eng.

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Electrical impedance myography (EIM) was used to assess the paretic muscle intrinsic electrical properties post stroke. Twenty-seven subjects with chronic hemiparesis participated in this study. Muscle impedance was measured by applying high-frequency, low-intensity alternating current to biceps brachii muscles. Major EIM parameters, resistance ( ), reactance ( ), phase angle ( ), and electrical anisotropy ratios (AR) of the three parameters, were examined at 50 kHz. Statistical analysis demonstrated significant reduction of reactance, phase angle, AR of resistance, and AR of reactance in the paretic muscle compared with the contralateral side (Paretic X: , contralateral X: , and p < 0.001; Paretic : , contralateral : 14.5 ± 0.82°, and p < 0.001; Paretic AR of R: 0.969 ± 0.013, contralateral AR of R: 1.008 ± 0.011, and p < 0.02; and Paretic AR of X: 0.981 ± 0.066, contralateral AR of X: 1.114 ± 0.041, and p < 0.02). Correlation analysis, however, did not show any significant relationship between EIM parameters and clinical assessments. Findings of this paper indicated significant changes in the muscular intrinsic electrical properties after stroke, possibly related to structural modifications induced by loss of muscle fibers or fat infiltration as well as changes in the quality of cell membranes post stroke.

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Application of the ${\rm F}$-Response for Estimating Motor Unit Number and Amplitude Distribution in Hand Muscles of Stroke Survivors

Cited by 25 publications

References 46 publications

Assessing Hand Muscle Structural Modifications in Chronic Stroke

Assessing Hand Muscle Structural Modifications in Chronic Stroke

WITHDRAWN: Changes of the F-wave in the acute phase of permanent spinal cord ischaemic injury predict spinal cord function in animal models of rabbits

Electrical Impedance Myography for Evaluating Paretic Muscle Changes After Stroke

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