Electromyographic assessment of muscle fatigue during isometric vibration training at varying frequencies

Mischi, Massimo; Rabotti, C.; Cardinale, Marco

doi:10.1109/iembs.2010.5627729

Cited by 15 publications

(19 citation statements)

References 16 publications

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“…Possible mechanisms contributing to the generation of motion artifacts were previously suggested to be variations in the half-cell potential caused by ionic gel movement at the metal-electrolyte interface and the skin-electrode interface (Kahn 1965), skin potential variations caused by skin stretch (Tam and Webster 1977;Ödman and Oberg 1982;Ödman 1981;de Talhouet and Webster 1996), and movement of the recording cables (Huhta and Webster 1973;Simakov and Webster 2010). Based on these findings, band-stop filters (Mischi and Cardinale 2009;Mischi et al 2010) and accelerometery-based adaptive filters (Xu et al 2013) were applied to the EMG signals recorded during VE to suppress those frequency peaks.…”

Section: Introductionmentioning

confidence: 99%

“…The MF can be estimated as the first statistical moment of the EMG amplitude spectrum (Merletti et al 1990). The CV of the motor unit action potentials along the muscle fibers can be estimated using two or more recording electrodes placed on the skin along the muscle fibers with known inter-electrode distance (Hunter et al 1987;Farina and Merletti 2004;Farina and Negro 2007;Mischi et al 2010;Rabotti et al 2010).…”

Section: Introductionmentioning

confidence: 99%

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On the nature of the electromyographic signals recorded during vibration exercise

Rabotti

Mischi

2015

Eur J Appl Physiol

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the nature of the electromyographic signals recorded during vibration exercise

Rabotti

Mischi

2015

Eur J Appl Physiol

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“…Muscles that are fatigued absorb less energy before they are stretched to such a degree it causes injuries. Three parts of localized muscle fatigue are described on the electromyogrphic signal: Non-Fatigue, Transitionto-Fatigue, and Fatigue [4][5][6]10,11,[19][20][21]. Non-Fatigue is when the fresh muscle is able to exert its maximum force.…”

Section: Introductionmentioning

confidence: 99%

A mathematical Model to Predict Transition-to-Fatigue During Isometric Exercise on Muscles of the Lower Extremities

Garza-Ulloa¹,

Yu²,

Gyan³

et al. 2012

ENG

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Surface Electromyography (sEMG) activities of the four muscles were studied from twelve healthy subjects to analyze muscle fatigue. Data were recorded while subjects performed isometric exercises for a period of time until fatigue. The signal was segmented with 5000 samples to enable the evolutionary process. Based on the mean power spectrum and Median Frequency (MDF) of each segment, we developed a methodology that is able to detect the signal into a meaningful sequence of Non-Fatigue to Transition-to-Fatigue. By identifying this transitional fatigue stage, it is possible to predict when fatigue will occur, which provides the foundation of the automated system that has the potential to aid in many applications of our lives, including sports, rehabilitation and ergonomics.

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“…We have recently developed a portable vibration stimulation device for the upper limbs [14]; this novel and portable device enables the user to perform isometric contraction exercise(s) of various intensities and superimpose a vibratory stimulation. To the best of the authors' knowledge, only few studies have investigated the effects of graded isometric contractions superimposed on vibration stimulation in the upper limbs [15]. The device developed by Mischi et al [15]- [17] is capable of superimposing vibration to various levels of muscle contraction by means of a pulley system with an operating frequency of 0-60Hz with a limited pulling force.…”

mentioning

confidence: 99%

“…To the best of the authors' knowledge, only few studies have investigated the effects of graded isometric contractions superimposed on vibration stimulation in the upper limbs [15]. The device developed by Mischi et al [15]- [17] is capable of superimposing vibration to various levels of muscle contraction by means of a pulley system with an operating frequency of 0-60Hz with a limited pulling force. With this approach, it was shown that the biceps and triceps muscles benefit show an increased EMG activity when vibration is superimposed to force production [17] and that this modality of exercise determines a higher degree of neuromuscular fatigue [15].…”

mentioning

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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Electromyographic assessment of muscle fatigue during isometric vibration training at varying frequencies

Cited by 15 publications

References 16 publications

On the nature of the electromyographic signals recorded during vibration exercise

On the nature of the electromyographic signals recorded during vibration exercise

A mathematical Model to Predict Transition-to-Fatigue During Isometric Exercise on Muscles of the Lower Extremities

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

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