The Position of Innervation Zones in the Biceps Brachii Investigated by Surface Electromyography

Masuda, Tadashi; Miyano, Hisao; Sadoyama, Tsugutake

doi:10.1109/tbme.1985.325614

Cited by 157 publications

(104 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Consequently, the stimulation of the motor points of each NMC affects the entire area of the motor plate. In the same manner, a group of motor plates delimits an area that corresponds to the highest level of electrical activity in a muscle 34,35 . The motor plates and the innervation zones are distal to the primary motor branch ramification 3 .…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the neuromuscular compartments in the peroneus longus muscle through electrical stimulation and accelerometry

Méndez

Gatica

Guzmán

et al. 2013

Braz. J. Phys. Ther.

View full text Add to dashboard Cite

| Background: Muscles are innervated exclusively by a nerve branch and possess definite actions. However, mammalian skeletal muscles, such as the trapezius, the medial gastrocnemius, and the peroneus longus, are compartmentalized. In the peroneus longus muscle, multiple motor points, which innervate individual neuromuscular compartments (NMC), the superior (S-NMC), anteroinferior (AI-NMC), and posteroinferior (PI-NMC), have been described. The contribution of each neuromuscular compartment to the final action of the muscle is fundamental for the rehabilitation of patients afflicted by neurological and muscle dysfunctions. Interventions are often based on electrical principles that take advantage of the physiological characteristics of muscles and nerves to generate therapeutic effects. Objective: To compare the effects of stimulating the different neuromuscular compartments (NMCs) of the peroneus longus muscle on the motor threshold (MT) and acceleration of the foot. Method: This is a cross-sectional study comprising 37 subjects. The three NMCs of the peroneus longus muscle were stimulated, and the acceleration of the foot and the motor threshold of each NMC were evaluated. A repeated measures analysis of variance with Bonferroni corrections of two intra-subjects factors was performed. Results: The stimulation of the different NMCs did not result in any differences in MT (F=2.635, P=0.079). There were significant differences between the axes of acceleration caused by the stimulation of the different NMCs (F=56,233; P=0.000). The stimulation of the posteroinferior compartment resulted in the greatest acceleration in the X-axis (mean 0.614; standard deviation 0.253). Conclusions: The posteroinferior compartment primarily contributes to the eversion movement of the foot. NMCs have specific functional roles that contribute to the actions of the muscles to which they belong.Keywords: neuromuscular compartment; peroneus longus muscle; accelerometry; motor threshold; motor point; physical therapy. HOW TO CITE THIS ARTICLEMéndez GA, Gatica VF, Guzmán EE, Soto AE. Evaluation of the neuromuscular compartments in the peroneus longus muscle through electrical stimulation and accelerometry. Braz J Phys Ther. 2013 Sept-Oct; 17(5):427-434. http://dx

show abstract

Section: Discussionmentioning

confidence: 99%

Evaluation of the neuromuscular compartments in the peroneus longus muscle through electrical stimulation and accelerometry

Méndez

Gatica

Guzmán

et al. 2013

Braz. J. Phys. Ther.

View full text Add to dashboard Cite

show abstract

“…The strongest monopolar sEMG signals are typically measured above the innervation zone, whereas bipolar sEMG signals are reduced in amplitude at the same area (Kleine et al 2000;Roy et al 1986). The locations of the innervation zones vary between individuals (Masuda et al 1985) and muscles (Barbero et al 2012;Rainoldi et al 2004), and they can vary also with respect to the sEMG electrodes in a force leveldependent manner due to the relative motion between the muscle and the skin (Piitulainen et al 2009). …”

Section: Spatial Variability Of Cmc Across Muscle Surfacementioning

confidence: 99%

Spatial variability in cortex-muscle coherence investigated with magnetoencephalography and high-density surface electromyography

Piitulainen

Botter

Bourguignon

et al. 2015

Journal of Neurophysiology

View full text Add to dashboard Cite

muscle coherence (CMC) reflects coupling between magnetoencephalography (MEG) and surface electromyography (sEMG), being strongest during isometric contraction but absent, for unknown reasons, in some individuals. We used a novel nonmagnetic high-density sEMG (HD-sEMG) electrode grid (36 mm ϫ 12 mm; 60 electrodes separated by 3 mm) to study effects of sEMG recording site, electrode derivation, and rectification on the strength of CMC. Monopolar sEMG from right thenar and 306-channel whole-scalp MEG were recorded from 14 subjects during 4-min isometric thumb abduction. CMC was computed for 60 monopolar, 55 bipolar, and 32 Laplacian HD-sEMG derivations, and two derivations were computed to mimic "macroscopic" monopolar and bipolar sEMG (electrode diameter 9 mm; interelectrode distance 21 mm). With unrectified sEMG, 12 subjects showed statistically significant CMC in 91-95% of the HD-sEMG channels, with maximum coherence at ϳ25 Hz. CMC was about a fifth stronger for monopolar than bipolar and Laplacian derivations. Monopolar derivations resulted in most uniform CMC distributions across the thenar and in tightest cortical source clusters in the left rolandic hand area. CMC was 19 -27% stronger for HD-sEMG than for "macroscopic" monopolar or bipolar derivations. EMG rectification reduced the CMC peak by a quarter, resulted in a more uniformly distributed CMC across the thenar, and provided more tightly clustered cortical sources than unrectifed sEMGs. Moreover, it revealed CMC at ϳ12 Hz. We conclude that HD-sEMG, especially with monopolar derivation, can facilitate detection of CMC and that individual muscle anatomy cannot explain the high interindividual CMC variability.

show abstract

“…Surface EMG is noninvasive and is usually chosen when studying the behavior of the muscle as a whole, as it measures the superimposed waveforms of the underlying EMG. With advances in electrode design, not only temporal patterns can be studied, but also, it is possible to investigate motor unit (MU) action potential (AP) propagation , estimate the MU conduction velocity (Farina et al 2000;Farina and Merletti 2004), locate the innervation zones (Masuda et al 1985), investigate MU recruitment (Farina et al 2002;Gazzoni et al 2001), or decompose the signals into constituent APs (Holobar and Zazula 2004). MU investigation with surface EMG often requires a very low activation level of the muscle or very low force.…”

mentioning

confidence: 99%

Wrist torque estimation during simultaneous and continuously changing movements: surface vs. untargeted intramuscular EMG

Kamavuako

Scheme

Englehart

2013

Journal of Neurophysiology

View full text Add to dashboard Cite

Kamavuako EN, Scheme EJ, Englehart KB. Wrist torque estimation during simultaneous and continuously changing movements: surface vs. untargeted intramuscular EMG. J Neurophysiol 109: 2658-2665, 2013. First published March 20, 2013 doi:10.1152/jn.00086.2013In this paper, the predictive capability of surface and untargeted intramuscular electromyography (EMG) was compared with respect to wrist-joint torque to quantify which type of measurement better represents joint torque during multiple degrees-of-freedom (DoF) movements for possible application in prosthetic control. Ten able-bodied subjects participated in the study. Surface and intramuscular EMG was recorded concurrently from the right forearm. The subjects were instructed to track continuous contraction profiles using single and combined DoF in two trials. The association between torque and EMG was assessed using an artificial neural network. Results showed a significant difference between the two types of EMG (P Ͻ 0.007) for all performance metrics: coefficient of determination (R 2 ), Pearson correlation coefficient (PCC), and root mean square error (RMSE). The performance of surface EMG (R 2 ϭ 0.93 Ϯ 0.03; PCC ϭ 0.98 Ϯ 0.01; RMSE ϭ 8.7 Ϯ 2.1%) was found to be superior compared with intramuscular EMG (R 2 ϭ 0.80 Ϯ 0.07; PCC ϭ 0.93 Ϯ 0.03; RMSE ϭ 14.5 Ϯ 2.9%). The higher values of PCC compared with R 2 indicate that both methods are able to track the torque profile well but have some trouble (particularly intramuscular EMG) in estimating the exact amplitude. The possible cause for the difference, thus the low performance of intramuscular EMG, may be attributed to the very high selectivity of the recordings used in this study. simultaneous movement; intramuscular EMG; surface electromyography; dynamic movement; torque and force estimation

show abstract

The Position of Innervation Zones in the Biceps Brachii Investigated by Surface Electromyography

Cited by 157 publications

References 7 publications

Evaluation of the neuromuscular compartments in the peroneus longus muscle through electrical stimulation and accelerometry

Evaluation of the neuromuscular compartments in the peroneus longus muscle through electrical stimulation and accelerometry

Spatial variability in cortex-muscle coherence investigated with magnetoencephalography and high-density surface electromyography

Wrist torque estimation during simultaneous and continuously changing movements: surface vs. untargeted intramuscular EMG

Contact Info

Product

Resources

About