Avaliação da fadiga muscular pela mecanomiografia durante a aplicação de um protocolo de EENM

Faller, Lilian; Neto, Guilherme Nunes Nogueira; Button, Vera L. S. N.; Nohama, Percy

doi:10.1590/s1413-35552009005000057

Cited by 21 publications

(4 citation statements)

References 33 publications

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“…However, associated with the decreased of MF, a progressive decrease in the RMS in CP for all masticatory muscles was observed in the present study, with a significant difference after 5s of MVC. The reduction of RMS values after muscle fatigue was also observed in other studies (18,20,21) . Maton et al (18) observed a decrease in RMS while maintaining 90 to 100% of bite force and a relationship between the time of isometric resistance and the level of bite force.…”

Section: Discussionsupporting

confidence: 85%

Efeito do tempo de contração e repouso na atividade dos músculos masseter e temporal anterior em indivíduos com DTM

Ries

Graciosa

Soares

et al. 2016

CoDAS

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Purpose The main objective of this study was to investigate the effect of time of contraction and rest on the masseter and temporal muscles activity. Methods 49 female subjects between 18 and 30 years of age were divided into TMD (n: 26) and control groups (n: 23). Surface electromyograph was used to evaluate the anterior temporal and masseter muscles during contraction and rest protocols. The root means square, median frequency and slope coefficient of the linear regression line parameters were analyzed. Results A significant effect of time in the contraction and rest muscle protocols was found. TMD patients showed a significant decrease in median frequency in the right masseter muscle and the slope coefficient in the right temporal muscle during the contraction protocol to control subjects. Conclusion Despite the TMD patients presented with higher fatigue susceptibility compared to the control group, both groups must meet the maximum time of 5 s of maximum voluntary contraction and at least 30 s rest between successive contractions of masticatory muscles during clinical or research assessment protocols.

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Section: Discussionsupporting

confidence: 85%

Efeito do tempo de contração e repouso na atividade dos músculos masseter e temporal anterior em indivíduos com DTM

Ries

Graciosa

Soares

et al. 2016

CoDAS

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“…An isokinetic dynamometer (Cybex Norm 6000, Cybex Division of Lumex, Inc., Ronkonkoma, NY, USA) was used for torque measurement. It was set to isometric mode at an angle of 60° degrees of knee flexion 18,29,36,37 .…”

Section: Apparatusmentioning

confidence: 99%

The influence of stimulus phase duration on discomfort and electrically induced torque of quadriceps femoris

Liebano¹,

Rodrigues²,

Murazawa³

et al. 2013

Braz. J. Phys. Ther.

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| Background: Although a number of studies have compared the influence of different electrical pulse parameters on maximum electrically induced torque (MEIT) and discomfort, the role of phase duration has been poorly investigated. Objective: To examine the variation in muscle torque and discomfort produced when electrically stimulating quadriceps femoris using pulsed current with three different phase durations in order to establish whether there are any advantages or disadvantages in varying the phase duration over the range examined. Method: This is a two repeatedmeasures, within-subject study conducted in a research laboratory. The study was divided into 2 parts with 19 healthy young adults in each part.In part 1, MEIT was determined for each phase duration (400, 700, and 1000 µs), using a biphasic pulsed current at a frequency of 50 Hz. In part 2, stimulus amplitude was increased until the contractions reached 40% of maximum voluntary isometric contraction (MVIC) and the associated discomfort produced by each phase duration was measured. Results: In part 1 of the study, we found that the average MEITs generated with each phase duration (400, 700, and 1000 µs) were 55.0, 56.3, and 58.0% of MVIC respectively, but the differences were not statistically significant (p=.45). In part 2, we found a statistically significant increase in discomfort over the same range of phase durations. The results indicate that, for a given level of torque production, discomfort increases with increasing phase duration (p=.008). Conclusions: Greater muscle torque cannot be produced by increasing the stimulus phase duration over the range examined. Greater discomfort is produced by increasing the stimulus phase duration.Keywords: electric stimulation; torque; quadriceps muscle; physical therapy. Trial Registration: NCT01862393 (ClinicalTrials.org). HOW TO CITE THIS ARTICLELiebano RE, Rodrigues TA, Murazawa MT, Ward AR. The influence of stimulus phase duration on discomfort and electrically induced torque of quadriceps femoris. Braz J Phys Ther. 2013 Sept-Oct; 17(5):479-486. http://dx

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“…During FES application, the electrical stimuli can interfere with EMG signals due to circuit limitations (Seki et al, 2003) in closed-loop systems (Venkatasubramanian et al, 2006). Because MMG is based on mechanical oscillations of muscles during contraction, it is not affected directly by electrical pulses yielded during FES application (Faller et al, 2009;Seki et al, 2003). MMG signals are viable as biofeedback to human-machine interface, such as a joystick (Xie and Dokos, 2013), myoelectrical prostheses Yu and Chang, 2010) or neuroprostheses control (Popovic and Thrasher, 2004) using temporal and spectral features (Beck et al, 2009;Stock et al, 2010a).…”

Section: Recognition To Neural/myoelectric Prosthesismentioning

confidence: 99%

Advances and perspectives of mechanomyography

Krueger

Scheeren

Nogueira-Neto

et al. 2014

Rev. Bras. Eng. Bioméd.

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Introduction: The evaluation of muscular tissue condition can be accomplished with mechanomyography (MMG), a technique that registers intramuscular mechanical waves produced during a fi ber's contraction and stretching that are sensed or interfaced on the skin surface. Objective: Considering the scope of MMG measurements and recent advances involving the technique, the goal of this paper is to discuss mechanomyography updates and discuss its applications and potential future applications. Methods: Forty-three MMG studies were published between the years of 1987 and 2013. Results: MMG sensors are developed with different technologies such as condenser microphones, accelerometers, laser-based instruments, etc. Experimental protocols that are described in scientifi c publications typically investigated the condition of the vastus lateralis muscle and used sensors built with accelerometers, third and fourth order Butterworth fi lters, 5-100Hz frequency bandpass, signal analysis using Root Mean Square (RMS) (temporal), Median Frequency (MDF) and Mean Power Frequency (MPF) (spectral) features, with epochs of 1 s. Conclusion: Mechanomyographic responses obtained in isometric contractions differ from those observed during dynamic contractions in both passive and functional electrical stimulation evoked movements. In the near future, MMG features applied to biofeedback closed-loop systems will help people with disabilities, such as spinal cord injury or limb amputation because they may improve both neural and myoelectric prosthetic control. Muscular tissue assessment is a new application area enabled by MMG; it can be useful in evaluating the muscular tonus in anesthetic blockade or in pathologies such as myotonic dystrophy, chronic obstructive pulmonary disease, and disorders including dysphagia, myalgia and spastic hypertonia. New research becomes necessary to improve the effi ciency of MMG systems and increase their application in rehabilitation, clinical and other health areas.

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Avaliação da fadiga muscular pela mecanomiografia durante a aplicação de um protocolo de EENM

Abstract: Background: Neuromuscular electrical stimulation (NMES) is a widely used technique for rehabilitation in physical therapy, however

Cited by 21 publications

References 33 publications

Efeito do tempo de contração e repouso na atividade dos músculos masseter e temporal anterior em indivíduos com DTM

Efeito do tempo de contração e repouso na atividade dos músculos masseter e temporal anterior em indivíduos com DTM

The influence of stimulus phase duration on discomfort and electrically induced torque of quadriceps femoris

Advances and perspectives of mechanomyography

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