Determination of fatigue in the electrically stimulated quadriceps muscle and relative effect of ischaemia

Rabischong, E.; Guiraud, David

doi:10.1016/0141-5425(93)90056-5

Cited by 31 publications

(15 citation statements)

References 9 publications

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“…The rapid decrease in torque output recorded in this population of patients in other studies has shown that it is not the result of ischaemia. 3 We recorded important changes in the computed parameters of the recorded CMAPs during these tests; first, we observed a reduction in amplitude and second the increase of latencies. The recorded CMAPs repre sent the summation of the contributing MUAP re cruited with electrical stimulation.…”

Section: Discussionmentioning

confidence: 86%

Compound motor action potentials and mechanical failure during sustained contractions by electrical stimulation in paraplegic patients

Rabischong¹,

Ohanna³

1995

Spinal Cord

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E Rabischong1, P-L Doutrelot2 and F Ohanna1ICentre Propara, Laboratory of Clinical Neurophysio logy, Parc Euro medecine, 34195 Montpellier cedex 5; 2Hopital Nord, Service de Reeducation Fon ctionnelle, 80054 Amiens cedex 1, FranceIn nine paraplegic patients we recorded the torque output and compound motor action potentials (CMAPs) produced by the quadriceps muscle during an isometric contraction elicited by electrical stimulation. The torque, the peak to peak amplitude, the latency, the peak to peak duration and the total surface of the rectified CMAPs were computed over a period of 126 s. After a brief increase the mechanical output rapidly decreased and reached a stable minimum level by the end of 126 s. The final torque output values ranged from 7. 1 to 54% of initial values. This torque decrease was related neither to length of time between injury and testing, nor to the thoracic level of the spinal cord injury. The peak to peak amplitude of the CMAPs changed over the course of stimulation. It was noted to increase over a period of time after which it decreased to a minimum level. The latency from the onset of stimulation to the onset of the CMAP varied to a relatively small extent compared to the peak to peak duration. Therefore, the conduction velocity along the muscle fibres appeared to be more affected by the test than by the conduction velocity along the nerve fibres and the transmission across the neuromuscular junction. The mechanisms involved in the changes in CMAPs and the change in torque output over the time course of stimulation are discussed.

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Section: Discussionmentioning

confidence: 86%

Compound motor action potentials and mechanical failure during sustained contractions by electrical stimulation in paraplegic patients

Rabischong¹,

Ohanna³

1995

Spinal Cord

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“…The identification based on experimental response would contribute strongly to realistic force prediction in electrical stimulation and FES controller development. Further investigation is required for the expression of fatigue phenomena [27], for its reproducibility and identification.…”

Section: Model Cross-validationmentioning

confidence: 99%

In Vivo Identification of Skeletal Muscle Dynamics with Nonlinear Kalman Filter: Comparison between EKF and SPKF

Hayashibe

Guiraud

Poignet

2013

ISRN Rehabilitation

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Skeletal muscle system has nonlinear dynamics and subject-specific characteristics. Thus, it is essential to identify the unknown parameters from noisy biomedical signals to improve the modeling accuracy in neuroprosthetic control. The objective of this work is to develop an experimental identification method for subject-specific biomechanical parameters of a physiological muscle model which can be employed to predict the nonlinear force properties of stimulated muscle. Our previously proposed muscle model, which can describe multiscale physiological system based on the Hill and Huxley models, was used for the identification. The identification protocols were performed on two rabbit experiments, where the medial gastrocnemius was attached to a motorized lever system to record the force by the nerve stimulation. The muscle model was identified using nonlinear Kalman filters: sigmapoint and extended Kalman filter. The identified model was evaluated by comparison with experimental measurements in the cross-validation manner. The feasibility could be demonstrated by comparison between the estimated parameter and the measured value. The estimates with SPKF showed 5.7% and 2.9% error in each experiment with 7 different initial conditions. It reveals that SPKF has great advantage especially for the identification of multiscale muscle model which accounts for the high nonlinearity and discontinuous states between muscle contraction and relaxation process.

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“…where Y is the measured parameter of the CMAP or the generated torque as a function of time, t. The parameters a, b, c and d are estimated by using the least-square error method [8].…”

Section: Analysis Of Fatigue Process From Features Of Evoked Emgmentioning

confidence: 99%

“…Thus, the data collected from the same session were first normalized to their initial value and then fitted using the hyperbolic function, which could also alleviate the inter-subject variations and musclelength discrepancies. To characterize the fatigue process, a hyperbolic tangent equation, generally used for the description of empirical data with a sigmoid-like curve, was adopted to fit both the parameters of the CMAP and the torque output [8]:…”

Section: Analysis Of Fatigue Process From Features Of Evoked Emgmentioning

confidence: 99%

“…Researchers reported that the first plateau represents the status before fatigue and the major slope indicates the exhausted expenditure of easily-fatigued (type II) MUs. Following the quick fatigue process, the final plateau represents the activation of the residual fatigue-resistant (type I) MUs [8]. From the electrophysiological aspect, the evoked EMG or compound muscle action potential (CMAP) of the stimulated muscle has been studied during the fatiguing process.…”

Section: Introductionmentioning

confidence: 99%

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Experimentation and Structural Modeling of Stimulus-Evoked Electromyography in Muscles During Electrically-Elicited Fatigue Process

Chang¹,

Yu²

2012

Applications of EMG in Clinical and Sports Medicine

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Determination of fatigue in the electrically stimulated quadriceps muscle and relative effect of ischaemia

Cited by 31 publications

References 9 publications

Compound motor action potentials and mechanical failure during sustained contractions by electrical stimulation in paraplegic patients

Compound motor action potentials and mechanical failure during sustained contractions by electrical stimulation in paraplegic patients

In Vivo Identification of Skeletal Muscle Dynamics with Nonlinear Kalman Filter: Comparison between EKF and SPKF

Experimentation and Structural Modeling of Stimulus-Evoked Electromyography in Muscles During Electrically-Elicited Fatigue Process

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