Do surface electromyograms provide physiological estimates of conduction velocity from the medial gastrocnemius muscle?

Gallina, Alessio; Ritzel, Cíntia Helena; Merletti, Roberto; Vieira, Taian

doi:10.1016/j.jelekin.2012.11.007

Cited by 19 publications

(9 citation statements)

References 31 publications

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“…Four 16-channel semi-disposable arrays with an interelectrode distance of 10 mm (OTBioelectronica, Torino, Italy) were placed over MG and LG. To avoid EMG detection from the distal region of gastrocnemius where EMGs have different characteristics as propagating action potentials can be observed (Gallina et al 2013), the first array was placed 20 mm above the insertion of the MG on the Achilles tendon and the three additional arrays were placed superior to the first. This formed a grid of 16 x 4 electrodes with 10 mm and 25 mm centre-to-centre distance in the medio-lateral and proximo-distal directions respectively.…”

Section: High-density Surface Emg Recordingsmentioning

confidence: 99%

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Regional modulation of the ankle plantarflexor muscles associated with standing external perturbations across different directions

et al. 2019

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Section: High-density Surface Emg Recordingsmentioning

confidence: 99%

“…'POS' being their position along either rows or columns in the grid (Gallina et al 2013). The barycenter is the centroid of the identified active muscle region and provides an estimate for identification of regional modulation within muscles.…”

Section: Regional Modulation Of the Plantarflexorsmentioning

confidence: 99%

Regional modulation of the ankle plantarflexor muscles associated with standing external perturbations across different directions

et al. 2019

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“…Further studies are therefore required to determine the most appropriate method for musclespecific IZ localization, particularly in muscles with in-depth pinnate (e.g. gastrocnemius [42,43]) and skin parallel-fibered (e.g. vastii [40]) architectures.…”

Section: Discussionmentioning

confidence: 99%

Motor unit innervation zone localization based on robust linear regression analysis

Liu

Jahanmiri-Nezhad

et al. 2019

Computers in Biology and Medicine

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With the aim of developing a flexible and reliable procedure for superficial muscle innervation zone (IZ) localization, we proposed a method to estimate IZ location using surface electromyogram (EMG) based on robust linear regression. Regression lines were used to model the bidirectional propagation pattern of a single motor unit action potential (MUAP) and visualize the trajectory of the MUAP propagation. IZ localization was performed by identifying the origin of the bidirectional MUAP propagation. Robust linear regression and MUAP peak detection, combined with propagation phase reversal identification, may provide an efficient way to estimate IZ location. Our method offers high resolution in locating IZs based on simulation studies and experimental tests. Furthermore, our method is flexible and may also be applied using a relatively small number of EMG channels. A comparative study of the proposed method and the crosscorrelation method for IZ localization was conducted. The results obtained with simulated MUAPs and measured spontaneous MUAPs in the biceps brachii muscle in six subjects (four males and two females, 57 ± 10 years old) with amyotrophic lateral sclerosis (ALS). Our method achieved estimation performance comparable to that obtained by using the cross-correlation method but with higher resolution. This study provides an accurate and practical method to estimate IZ location.

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“…In order to determine the spatial extension of the muscle tap responses, we computed the distribution of RMS values for EMG responses detected by the electrode array positioned transversally to VM fibres. For each tap force, the set of 32 RMS values (20 ms epochs starting at EMG onset defined at the innervation zone channel) was fitted with a Gaussian distribution as described in Gallina and Vieira 21 . The mean and the standard deviation of the optimal Gaussian curve were used to describe the mean location and the transverse dimension of the VM region excited by muscle tapping.…”

Section: Mechanical Muscle Tapmentioning

confidence: 99%

The peripheral origin of tap-induced muscle contraction revealed by multi-electrode surface electromyography in human vastus medialis

Botter

Vieira

Geri

et al. 2020

Sci Rep

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It is well established that muscle percussion may lead to the excitation of muscle fibres. It is still debated, however, whether the excitation arises directly at the percussion site or reflexively, at the end plates. Here we sampled surface electromyograms (EMGs) from multiple locations along human vastus medialis fibres to address this issue. In five healthy subjects, contractions were elicited by percussing the distal fibre endings at different intensities (5-50 N), and the patellar tendon. EMGs were detected with two 32-electrode arrays, positioned longitudinally and transversally to the percussed fibres, to detect the origin and the propagation of action potentials and their spatial distribution across vastus medialis. During muscle percussion, compound action potentials were first observed at the electrode closest to the tapping site with latency smaller than 5 ms, and spatial extension confined to the percussed strip. Conversely, during tendon tap (and voluntary contractions), action potentials were first detected by electrodes closest to end plates and at a greater latency (mean ± s.d., 28.2 ± 1.7 ms, p < 0.001). No evidence of reflex responses to muscle tap was observed. Multi-electrode surface EMGs allowed for the first time to unequivocally and quantitatively describe the non-reflex nature of the response evoked by a muscle tap.

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Do surface electromyograms provide physiological estimates of conduction velocity from the medial gastrocnemius muscle?

Cited by 19 publications

References 31 publications

Regional modulation of the ankle plantarflexor muscles associated with standing external perturbations across different directions

Regional modulation of the ankle plantarflexor muscles associated with standing external perturbations across different directions

Motor unit innervation zone localization based on robust linear regression analysis

The peripheral origin of tap-induced muscle contraction revealed by multi-electrode surface electromyography in human vastus medialis

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