Differences between vastus medialis and lateralis excitation onsets are dependent on the relative distance of surface electrodes placement from the innervation zone location

Souza, Leonardo Mendes Leal de; Cabral, Hélio V.; Oliveira, Líliam Fernandes de; Vieira, Taian

doi:10.1016/j.jelekin.2022.102713

Cited by 2 publications

(2 citation statements)

References 31 publications

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“…This study exhibited a number of limitations. Firstly, it has recently been reported that errors in VM−VL onset may amount to −12 ms when not taking the relative position of bipolar electrodes between muscles into account ( 45 ). Therefore, it is possible that sex differences in onset timing did not emerge due to possible discrepancies in the position of bipolar electrodes in relation to the innervation zone for VM and VL.…”

Section: Limitationsmentioning

confidence: 99%

Males and females have similar neuromuscular coordination strategies of the quadriceps during fatiguing repeated all-out cycling

Cederbaum,

Yoon,

Côté

2023

Front. Sports Act. Living

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IntroductionAn imbalance of vastus medialis (VM) and vastus lateralis (VL) muscle activation and patterns of dyscoordination may contribute to the sex discrepancy in the incidence of patellofemoral pain syndrome (PFPS). While some studies have examined sex-specific VM/VL coordination strategies in some tasks, no previous studies have examined sex-specific VM/VL coordination strategies during repeated sprint exercise (RSE).MethodsIn this study, asymptomatic young adults (N = 39, 19 females) completed a RSE protocol consisting of 10 × 10 s all-out cycling interspersed by 30 s of passive rest. Electromyographic (EMG) signals from the VM and VL muscles were recorded throughout exercise.ResultsVM:VL ratio did not change with fatigue and was not different between the sexes. From sprint 1 to 10, VM-VL onset delay increased from 9.62 to 16.95 ms and from 19.28 to 45.09 ms in males and females, respectively (p < 0.001); however, no sex difference was found (p = 0.524). Muscle activation amplitude plateaued at different sprint repetitions in males and females while mechanical work plateaued at similar repetitions.DiscussionThese findings suggest that sex differences in the incidence of PFPS may not be influenced by VM/VL muscle coordination as assessed by EMG.

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Section: Limitationsmentioning

confidence: 99%

Males and females have similar neuromuscular coordination strategies of the quadriceps during fatiguing repeated all-out cycling

Cederbaum,

Yoon,

Côté

2023

Front. Sports Act. Living

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“…The innervation zone (IZ) of a muscle is the region where muscle fibers are innervated by motor axon terminals. The architecture of the IZ can influence electromyographic (EMG) signal characteristics recorded from the muscle surface ( Nishihara et al, 2010 ; Rantalainen et al, 2012 ; Gallina et al, 2013 ; Ye et al, 2015 ; Smith et al, 2017 ; de Souza et al, 2022 ). The ability to detect the location of the IZ using EMG techniques has implications for understanding muscle function in health and disease.…”

Section: Introductionmentioning

confidence: 99%

Muscle innervation zone estimation from monopolar high-density M-waves using principal component analysis and radon transform

Huang

Lu²,

Chen³

et al. 2023

Front. Physiol.

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This study examined methods for estimating the innervation zone (IZ) of a muscle using recorded monopolar high density M waves. Two IZ estimation methods based on principal component analysis (PCA) and Radon transform (RT) were examined. Experimental M waves, acquired from the biceps brachii muscles of nine healthy subjects were used as testing data sets. The performance of the two methods was evaluated by comparing their IZ estimations with manual IZ detection by experienced human operators. Compared with manual detection, the agreement rate of the estimated IZs was 83% and 63% for PCA and RT based methods, respectively, both using monopolar high density M waves. In contrast, the agreement rate was 56% for cross correlation analysis using bipolar high density M waves. The mean difference in estimated IZ location between manual detection and the tested method was 0.12 ± 0.28 inter-electrode-distance (IED) for PCA, 0.33 ± 0.41 IED for RT and 0.39 ± 0.74 IED for cross correlation-based methods. The results indicate that the PCA based method was able to automatically detect muscle IZs from monopolar M waves. Thus, PCA provides an alternative approach to estimate IZ location of voluntary or electrically-evoked muscle contractions, and may have particular value for IZ detection in patients with impaired voluntary muscle activation.

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Differences between vastus medialis and lateralis excitation onsets are dependent on the relative distance of surface electrodes placement from the innervation zone location

Cited by 2 publications

References 31 publications

Males and females have similar neuromuscular coordination strategies of the quadriceps during fatiguing repeated all-out cycling

Males and females have similar neuromuscular coordination strategies of the quadriceps during fatiguing repeated all-out cycling

Muscle innervation zone estimation from monopolar high-density M-waves using principal component analysis and radon transform

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