Acoustic and surface EMG diagnosis of pediatric muscle disease

Barry, D. T.; Gordon, Kevin; Hinton, George G.

doi:10.1002/mus.880130403

Cited by 117 publications

(82 citation statements)

References 9 publications

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“…In general, EEA was determined to improve (ie, greater force production was accompanied by decreases in EMG amplitude) with training-induced increases in strength and deteriorated with a fatiguing task. 15,16 Barry et al 7 suggested the dissociation between the electric and mechanical events of muscle function (ie, electromechanical coupling) might be better captured through examination of changes in the ratio of MMG to EMG amplitudes, which creates an index of ''electromechanical efficiency'' (EME).…”

Section: Journal Of Athletic Trainingmentioning

confidence: 99%

“…For example, MMG has been used to noninvasively provide diagnostic information about muscular diseases such as spastic cerebral palsy, 6 pediatric neuromuscular disorders, 7 and muscular dystrophy, 8,9 as well as to determine age-related changes in muscle function 10 and to assess muscle fiber composition. 11 In nonclinical populations, authors 2,[12][13][14] have reported a close relationship between MMG amplitude and torque production during repeated, concentric muscle actions.…”

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confidence: 99%

“…Previous investigators [6][7][8][9][10][11] have used EMG and MMG to examine the electric and mechanical aspects, respectively, of muscle function during a given task, both in clinical and nonclinic populations. For example, MMG has been used to noninvasively provide diagnostic information about muscular diseases such as spastic cerebral palsy, 6 pediatric neuromuscular disorders, 7 and muscular dystrophy, 8,9 as well as to determine age-related changes in muscle function 10 and to assess muscle fiber composition.…”

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confidence: 99%

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Fatigue and the Electromechanical Efficiency of the Vastus Medialis and Vastus Lateralis Muscles

Ebersole

Malek

2008

Journal of Athletic Training

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Context:The relationship between the amplitudes of the mechanomyographic (MMG) and electromyographic (EMG) signals has been used to examine the ''electromechanical efficiency'' (EME) of normal and diseased muscle. The EME may help us to better understand the neuromuscular relationship between the vastus medialis and vastus lateralis muscles.Objective: To examine the EME of the vastus medialis and vastus lateralis muscles during a fatiguing task.Design: Repeated-measures design. Setting: Research laboratory.Patients or Other Participants: Ten healthy males (age 5 23.2 6 1.2 years) with no history of knee injury.Intervention(s): Seventy-five consecutive, maximal concentric isokinetic leg extensions at a velocity of 1806/s.Main Outcomes Measure(s): Bipolar surface EMG electrodes were placed over the vastus medialis and vastus lateralis muscles, with an MMG contact sensor placed adjacent to the superior EMG electrode on each muscle. The MMG and EMG amplitude values (root mean squares) were calculated for each of the 75 repetitions and normalized to the highest value from the 75 repetitions. The EME was expressed as the ratio of the log-transformed normalized MMG amplitude to the normalized EMG amplitude. For each muscle, the linear relationship for the normalized-group mean EME was determined across the 75 repetitions.Results: Linear regression indicated decreases in torque (R 2 5 .96), vastus medialis EME (R 2 5 .73), and vastus lateralis EME (R 2 5.73). The slopes for the vastus medialis and vastus lateralis EME were not different (P . .10).Conclusions: The similarities in the fatigue-induced decreases in EME for the vastus medialis and vastus lateralis muscles suggested that symmetry was present between the muscles in the electric and mechanical responses to repeated, maximal muscle actions. The EME measurements may provide a unique insight into the influence of fatigue on the contractile properties of skeletal muscle, including alterations that occur to the intrinsic electric and mechanical components. The EME may be useful in assessing and quantifying clinically relevant asymmetries in vastus medialis and vastus lateralis muscle function in those with knee injuries.Key Words: mechanomyography, electromyography Key PointsN In healthy muscle, the electromechanical efficiency of the vastus medialis and vastus lateralis muscles decreased concurrently with decreased torque. Thus, as suggested by others, electromechanical efficiency may provide an index of changes in electromechanical coupling.N Electromechanical efficiency may offer insight into the influence of fatigue on skeletal muscle function and be a useful tool to assess and quantify clinically relevant asymmetries in vastus medialis and vastus lateralis muscle function in those with knee conditions.

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Section: Journal Of Athletic Trainingmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Fatigue and the Electromechanical Efficiency of the Vastus Medialis and Vastus Lateralis Muscles

Ebersole

Malek

2008

Journal of Athletic Training

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“…Electromyography (EMG), which measures electrical potentials generated by muscle cells, is one such technology. Driven by the growing societal recognition of the needs of people with physical disabilities, researchers are using EMG to diagnose muscular diseases, assess progress in muscular rehabilitation, and directly control prosthetics [1,8,9,11,18]. In these systems, researchers use detailed knowledge of the human physiology to apply sensors, measure activity in specific muscles, and infer intended or unintended movements from recorded data.…”

Section: Introductionmentioning

confidence: 99%

Demonstrating the feasibility of using forearm electromyography for muscle-computer interfaces

Saponas

Tan

Morris

et al. 2008

Proceedings of the SIGCHI Conference on Human Factors in Computing Systems

236

147

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We explore the feasibility of muscle-computer interfaces (muCIs): an interaction methodology that directly senses and decodes human muscular activity rather than relying on physical device actuation or user actions that are externally visible or audible. As a first step towards realizing the mu-CI concept, we conducted an experiment to explore the potential of exploiting muscular sensing and processing technologies for muCIs. We present results demonstrating accurate gesture classification with an off-the-shelf electromyography (EMG) device. Specifically, using 10 sensors worn in a narrow band around the upper forearm, we were able to differentiate position and pressure of finger presses, as well as classify tapping and lifting gestures across all five fingers. We conclude with discussion of the implications of our results for future muCI designs.

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“…Using the ratio of SEMG electrical amplitude to acoustic amplitude, children with Duchenne, Becker, and myotonic dystrophy had significantly higher ratios than normal control subjects. 8 Similarly, using the ratio of the root mean square SEMG amplitude to the mechanomyogram amplitude, the electromechanical coupling efficiency of some muscles was statistically different in patients with myotonic dystrophy (all with CTG expansion) compared with that of age-matched control subjects. 9 In a brief report, 10 SEMG activity in one patient with myotonia congenita and transient weakness showed a decline in mean root SEMG voltage compared with that of a patient without transient weakness and a single control.…”

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confidence: 99%

Clinical utility of surface EMG [RETIRED]

et al. 2000

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This report reviews the clinical uses of surface electromyography (SEMG) as a diagnostic tool for neurologic disorders. SEMG is assessed with regard to the evaluation of patients with neuromuscular diseases, low back pain, and disorders of motor control. This broadens the scope of a previous assessment of SEMG in neurologic practice by the American Association of Electrodiagnostic Medicine 1 in which its utility was examined with regard to neuromuscular diseases only.Needle electromyographic evaluation (NEMG), in combination with nerve conduction studies, is the gold standard methodology for assessing the neurophysiologic characteristics of neuromuscular diseases. Moreover, fine-wire EMG (FWEMG) often has been used in the evaluation of gait disorders, kinesiologic studies, and research and is also considered a standard. Nevertheless, NEMG and FWEMG are both invasive and painful, and this limits their use when activity from several muscles needs to be monitored simultaneously.SEMG is a technique to measure muscle activity noninvasively using surface electrodes placed on the skin overlying the muscle. SEMG differs from NEMG and FWEMG with respect to technical requirements and electrical properties. Unlike NEMG, SEMG electrodes record from a wide area of muscle territory, have a relatively narrow frequency band (range, 20 to 500 Hz), have low-signal resolution, and are highly susceptible to movement artifact. SEMG electrodes typically are approximately 10 mm in diameter and usually are passive (i.e., they are simple conductive surfaces requiring low skin resistance). They can, however, be active, incorporating preamplifier electronics that lessen the need for low skin resistance and improve the signal-to-noise ratio. SEMG can record both voluntary and involuntary muscle activity in addition to externally stimulated muscle action potentials such as motor evoked potentials after central or peripheral nerve stimulation.2 SEMG has also been used in several non-neurologic settings such as obstetric monitoring and animal research, but these potential applications are beyond the scope of this review.More than 2500 original articles, reviews, and books were examined to determine the scope of SEMG utility, its benefits and risks, and the extent to which SEMG techniques vary, and to assess SEMG's strengths and weaknesses for specific clinical applications. Manual and computerized literature searches from the National Library of Medicine were used to obtain the articles. Key words used included SEMG, spontaneous activity, fasciculation, myopathy, muscle fiber conduction, motor unit estimation, fatigue, low-back pain, tremor, movement disorders, reaction time, and psychophysics. Representative articles are cited and listed at the end of this article. Other key words relating to neuromuscular diseases (other than when cross-referenced with SEMG) were not searched for specifically because this topic was the focus of the earlier AAEM assessment 1 and was not the main focus of the current paper. Neuromuscular diseases.No original ...

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Acoustic and surface EMG diagnosis of pediatric muscle disease

Cited by 117 publications

References 9 publications

Fatigue and the Electromechanical Efficiency of the Vastus Medialis and Vastus Lateralis Muscles

Fatigue and the Electromechanical Efficiency of the Vastus Medialis and Vastus Lateralis Muscles

Demonstrating the feasibility of using forearm electromyography for muscle-computer interfaces

Clinical utility of surface EMG [RETIRED]

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