Contents: Download. Thien Luu Gia READ PAPER. Download pdf. ×Close. Log In. Log In with Facebook Log In with. This test 1 Gia Thien Luu is with Post and Telecommunication Institute of Tech- comprises three trials for which he was asked to develop nology, Viet Nam. PDF | Muscle fiber conduction velocity (MFCV) is based on the time delay estimation between Gia -Thien LUU, Philippe RAVIER, and Olivier BUTTELLI.

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Comparison of Maximum Likelihood and. Time Frequency Approaches for Time Varying. Delay Estimation in The Case of. Electromyography Signals. Gia Thien. Download Updated PDF Bibliography (as of 1st June ) Thien Le Nguyen Gia / Recognition and enforcement of foreign arbitral awards in Vietnam: current . Authors; Authors and affiliations. Gia-Thien Luu Email author; Trung Duy Tran; Hanh Tan; Thanh Tung Ngo; Philippe Ravier; Olivier Buttelli.

References 1. Allen DC, Arunachalam R, Mills KR Critical illness myopathy: further evidence from muscle-fiber excitability studies of an acquired channelopathy. Muscle Nerve —22 Google Scholar 2. J Electromyogr Kinesiol — Google Scholar 3. Tellakula AK Acoustic source localization using time delay estimation. Clifford Carter G Time delay estimation for passive sonar signal processing — Google Scholar 6. Luu G-T, Ravier P, Buttelli O Comparison of maximum likelihood and time frequency approaches for time varying delay estimation in the case of electromyography signals.

Luu G-T, Ravier P, Buttelli O The non-parametric approach for time-varying delay estimation with application to the electromyographics signals. Sig Process —44 Google Scholar Philippe R, Dario F, Olivier B Time-varying delay estimators for measuring muscle fiber conduction velocity from the surface electromyogram.

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Biomed sig process control — Google Scholar Nishizono H, Saito Y, Miyashita M The estimation of conduction velocity in human skeletal muscle in situ with surface electrodes. Log In Sign Up. Thien Luu Gia.

Olivier Buttelli.

Philippe Ravier. Validation of the Time Delay Estimators Applied to the Surface Electromyography Signals during Isometric Isotonic and Isometric Anisotonic Contraction Gia Thien Luu1 and Philippe Ravier2 and Olivier Buttelli2 Abstract— The aim of this study is to validate the time choice of muscle taken as reference in vivo bio-mechanical delay estimators recently developed by our group.

We test the studies. This muscle must approach the characteristics of the estimators with the real data in both case isometric isotonic and equivalent one [10].

In this study, we used the biceps brachii isometric anisotonic contraction in order to take into account the stationarity and the non-stationarity of the data. The muscle to establish the relationship between the MFCV and results indicate that these estimators have coherent behaviors the Force. Considering the respect of the recruitment I. A increase in MFCV may be explained only by a greater number of MU recruited Due to the easy interpretability, Muscle Fiber Conduction with size larger and this can only be achieved when we have Velocity MFCV becomes an useful physiological indicator a major spatial recruitment.

This can only be established of electromyography EMG activity. Moreover, it is also applied in many fundamental studies on These estimators were developed according to the stationarity motor control whose applications include both the medical and non-stationarity of the signals.

That is why we tested field and ergonomics. In and the local stationarity of the signals isometric anisotonic3 this study, we are interested only in surface electromyog- contraction.

The paper is organized as follow: In section 2, the material With the increase in the force of contraction, it has often and methods will be presented; section 3 shows the results been observed to increase the MFCV [4]; [5]; [6]; [7].

This was anisotonic contraction and discussions. In section 4, we interpreted as a reflection of an increase in the number conclude the paper.


However, II. These conflicting results may be explained by different familiar with passing this type of test.

The required exercises muscle patterns between these studies. These differences were realized all the right elbow flexion. Force levels were relate to the typological characteristics of the muscle and expressed as a percentage of maximal voluntary contraction also the architecture of articular complex which the muscle MVC.

The sEMG activity studied was which of the biceps studied crosses. Indeed, in order to observe a qualitative brachii, main muscle of elbow flexion. Protocol That is why the recommendations were made regarding the A pretest was performed to define the MVC.

This test 1 Gia Thien Luu is with Post and Telecommunication Institute of Tech- comprises three trials for which he was asked to develop nology, Viet Nam lgthien ptithcm. Between each test, 3 minutes of Raw signals recovery were imposed. The most important force developed sEMG channel N. U 6 on the set of contractions was considered to be the MVC. An isotonic isometric test comprising a series of 10 measure- ments for different percentages of MVC.

Materials 0 0 During these tests, measurement of moment of force Number of Samples was synchronized with that of the EMG activity of the biceps brachii. The subject was positioned in an ergometer Fig. The lines indicate the orientation of the propagation of Orleans.

Percentage to adjust its dimensions with anthropometric characteristics Maximal Voluntary Contraction, N.

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Normalised Arbitrary Unit of the subject. The latter was placed in a seat, the bust oriented vertically, his back against a backrest which go back up the shoulders. Different straps allow restraint in C. Selection of Channels the pelvis and shoulders. The elbow was supported on a Depending on the positioning of the electrodes along the bracket with an angular aperture of the angle was MF, the 6-channels sEMG did not give the same signal checked using an electrogoniometer, Biometrics , forearm quality.

The selection of the series, used in our comparison positioned horizontally. The measurement of force was car- methods is established on several criteria: A strap placed at the wrist forearm connected to the a gathering in differential mode; force sensor. In Fig. Before placement [] can not be accepted.

It has been shown using of the electrodes, the skin was shaved and cleaned. The multi-channel collections that CV values increased for array of electrodes was oriented along the main direction channels located near inappropriate anatomical areas of muscle fiber MF. The sampling frequency was 10 kHz. The [] to the pair [], respectively.

The choice was made on graphical interface provided a preliminary quality control the second pair in relation to the lower conduction velocity of the EMG signal for the experimenter but also visual identified with an average correlation coefficient near 0.

The mean values of The effective force was shown by a cursor and the reference the correlation coefficient and that of the CV over the entire by a pattern. Subsequent processing of the data was made 0. The s, The first pair is not selected while series of results corresponding to the channels of pairs [], satisfying both criteria low CV and a satisfactory correlation [], [], [], [].

Conduction velocity for different power levels calculated with the Fig. Conduction velocities obtained by the reference cross- inter correlation method. This graph illustrates the problem of pair selection. The duration of the slices is samples.

Pair [] 4. In this case, we used 4 Pair [] 0.Cite paper How to cite? Do the generalized correlation methods improve time delay estimation of the muscle fiber conduction velocity? Army, he made the perfect model for a post—World War II American general, excelling as a combat leader, manager, and executive.

This study presents a set of approaches for instantaneous delay estimation from two-channels EMG signals.

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