On the nature of the electromyographic signals recorded during vibration exercise

Xu, Lin; Rabotti, C.; Mischi, Massimo

doi:10.1007/s00421-014-3091-7

Cited by 24 publications

(32 citation statements)

References 54 publications

(100 reference statements)

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“…This may be explained by assuming the SP VF component to mainly reflect muscle activity resulting from synchronization of a number of motor units through TVR. Indeed, our previous study indicated the SP VF to be caused by vibration-induced stretch reflex rather than motion artifacts [40]. In this case, the motor-unit synchronization indicated by FD originates not only from the central nervous system but also from the TVR; removal of the SP VF may therefore reduce the contribution of TVRinduced motor-unit synchronization, leading to a decrease in FD decay, particularly at 30 Hz.…”

Section: Discussionmentioning

confidence: 99%

“…It is extensively reported in the literature that sharp spectral peaks at the vibration frequency, SP VF , can be observed in the EMG spectrum recorded during VE, whose interpretation (motion artifacts or muscle activity) remains controversial [2], [9], [14], [39], [40], [41]. In this study, a more thorough understanding of the fatiguing effect introduced by VE at different frequencies was pursued by fatigue estimation performed with and without SP VF removal.…”

Section: Discussionmentioning

confidence: 99%

“…In some studies, these SP VF were considered as motion artifacts and excluded from the EMG analysis [2], [9], [39]. However, some other studies suggested those SP VF to be vibration-induced muscle activity [14], [40], [41]. In the present study, in order to fairly examine the fatigue effect introduced by VE at different frequencies, estimation for the four fatigue indicators was performed under two conditions: with and without removing the SP VF .…”

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confidence: 99%

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Analysis of Vibration Exercise at Varying Frequencies by Different Fatigue Estimators

Rabotti

Mischi

2016

IEEE Trans. Neural Syst. Rehabil. Eng.

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Abstract-Vibration exercise (VE) has been suggested to improve muscle strength and power performance, due to enhanced neuromuscular demand. However, understanding of the most appropriate VE protocols is lacking, limiting the optimal use of VE in rehabilitation programs. In this study, the fatiguing effect of vibration at different frequencies was investigated by employing a force-modulation VE system. Twenty volunteers performed 12-s isometric contractions of the biceps brachii with a load consisting of a baseline force of 80% of their maximum voluntary contraction (MVC) and a superimposed sinusoidal force at 0 (control condition with no vibration), 20, 30, and 40 Hz. Mechanical fatigue was estimated by assessment of MVC decay after each task while myoelectric fatigue was estimated by analysis of multichannel EMG signals recorded during VE. EMG conduction velocity, spectral compression, power, and fractal dimension were estimated as indicators of myoelectric fatigue. Our results suggest vibration, in particular at 30 Hz, to produce a larger degree of fatigue as compared to control condition. These results motivate further research aiming at introducing VE in rehabilitation programs with improved training protocols.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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Analysis of Vibration Exercise at Varying Frequencies by Different Fatigue Estimators

Rabotti

Mischi

2016

IEEE Trans. Neural Syst. Rehabil. Eng.

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“…However it is still unclear whether the spectral peaks correlating with the stimulation frequencies are in fact motion artifacts [23] or stretch reflexes [13]. Recent evidence suggests that these peaks might indeed be stretch reflexes [25]. Considering the present ambiguity about the existence of motion artifacts and increasing evidence towards the presence of stretch reflex [13], [25], only the spectra exhibiting the largest power and hence potential to skew the results were removed.…”

Section: Line Artifact Removalmentioning

confidence: 99%

“…Recent evidence suggests that these peaks might indeed be stretch reflexes [25]. Considering the present ambiguity about the existence of motion artifacts and increasing evidence towards the presence of stretch reflex [13], [25], only the spectra exhibiting the largest power and hence potential to skew the results were removed. The largest spectra were found to be at 50Hz coinciding with mains frequency of some of the equipment.…”

Section: Line Artifact Removalmentioning

confidence: 99%

Fatiguing Effects of Indirect Vibration Stimulation in Upper Limb Muscles- pre, post and during Isometric Contractions Superimposed on Upper Limb Vibration

Pujari¹,

Neilson

Cardinale³

2018

Preprint

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Background: Indirect vibration stimulation i.e. whole body vibration and upper limb vibration (ULV), are gaining popularity as exercise intervention for sports and rehabilitation applications. However, the fatiguing effects of indirect vibration stimulation are not yet fully understood. In addition, current vibration stimulation devices have a series of limitations. For this scope, we investigated the effects of ULV superimposed on fatiguing graded isometric contractions using a newly, purpose developed upper limb stimulation device. Twelve healthy volunteers were exposed to both ULV superimposed to fatiguing isometric contractions, at 80% of the maximum voluntary contractions (V) and just isometric contractions performed on a custom designed arm curl/flexion device-Control (C). The stimulation used consisted of 30Hz frequency of 0.4mm amplitude. Surface electromyographic (EMG) activity of the Biceps Brachii (BB), Triceps Brachii (TB), and Flexor Carpi Radialis (Forearm-FCR) were measured during both V and C conditions. EMG amplitude (EMGrms) and mean frequency (MEF) were computed to quantify muscle activity and fatigue levels respectively. Results: All three muscles BB, TB and FCR displayed significantly higher reduction in MEFs and corresponding significant increase in EMGrms with the V than the C, during fatiguing contractions (P < 0.05). Post vibration treatment, all muscles showed higher levels of MEFs after recovery compared to the control. Conclusions: Our results show that near maximal (80% of MVC) isometric fatiguing contractions superimposed on vibration stimulation lead to a higher rate of fatigue development compared to the isometric contraction alone in the upper limb muscles. Results also show, higher manifestation of mechanical fatigue post treatment with vibration compared to the control. Vibration superimposed on isometric contraction not only seems to alter the neuromuscular function during fatiguing efforts by inducing higher neuromuscular load but also post vibration treatment, potentially through the augmentation of stretch reflex and/or higher central motor command excitability.

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The EMG activity–acceleration relationship to quantify the optimal vibration load when applying synchronous whole-body vibration

Giminiani

Masedu

Padulo

et al. 2015

Journal of Electromyography and Kinesiology

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On the nature of the electromyographic signals recorded during vibration exercise

Cited by 24 publications

References 54 publications

Analysis of Vibration Exercise at Varying Frequencies by Different Fatigue Estimators

Analysis of Vibration Exercise at Varying Frequencies by Different Fatigue Estimators

Fatiguing Effects of Indirect Vibration Stimulation in Upper Limb Muscles- pre, post and during Isometric Contractions Superimposed on Upper Limb Vibration

The EMG activity–acceleration relationship to quantify the optimal vibration load when applying synchronous whole-body vibration

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