2006
DOI: 10.1016/j.jneumeth.2006.01.019
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The effects of innervation zone on electromyographic amplitude and mean power frequency during incremental cycle ergometry

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Cited by 62 publications
(106 citation statements)
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References 47 publications
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“…The proximity of the EMG electrodes to a muscle's innervation zone can affect features of the EMG signal (de Luca 1997), and the innervation zone can show considerable variability in its location for certain muscles (Rainoldi et al 2004). However, normalized measures of EMG amplitude have been shown to remove the sensitivity to electrode placement for cycling-based studies (Malek et al 2006), and such an approach has been used here to quantify the patterns of activity. We have recently used cross-correlation to shown that the cross-talk in raw EMG signal between adjacent muscles for our cycle tests has r 2 Ͻ 0.04 (Wakeling 2008b), and thus Ն96% of the EMG signal measured from an electrode can be ascribed to that muscle.…”
Section: Discussionmentioning
confidence: 99%
“…The proximity of the EMG electrodes to a muscle's innervation zone can affect features of the EMG signal (de Luca 1997), and the innervation zone can show considerable variability in its location for certain muscles (Rainoldi et al 2004). However, normalized measures of EMG amplitude have been shown to remove the sensitivity to electrode placement for cycling-based studies (Malek et al 2006), and such an approach has been used here to quantify the patterns of activity. We have recently used cross-correlation to shown that the cross-talk in raw EMG signal between adjacent muscles for our cycle tests has r 2 Ͻ 0.04 (Wakeling 2008b), and thus Ն96% of the EMG signal measured from an electrode can be ascribed to that muscle.…”
Section: Discussionmentioning
confidence: 99%
“…Similarly, Malek et al 24 reported that the absolute EMG amplitude was greater for the distal location relative to directly on or proximal to the IZ during incremental cycle ergometry for the vastus lateralis muscle. Their findings, 23,24 in conjunction with more recent results by DeFreitas et al, 22,25 suggest that the IZ may influence the EMG signal during various muscle actions.…”
Section: Muscle Nerve 44: 424-431 2011mentioning
confidence: 87%
“…19 The majority of studies examining the effects of the IZ on neuromuscular response patterns to exercise perturbations have predominantly focused on the EMG signal. [22][23][24] For example, Beck et al 23 reported that electrodes placed directly over the IZ and within 10 mm proximal to the IZ for the vastus lateralis resulted in reductions in the absolute EMG amplitude relative to the more distal sites during isometric muscle actions. Similarly, Malek et al 24 reported that the absolute EMG amplitude was greater for the distal location relative to directly on or proximal to the IZ during incremental cycle ergometry for the vastus lateralis muscle.…”
Section: Muscle Nerve 44: 424-431 2011mentioning
confidence: 99%
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“…O sinal EMG reflete a somação linear algébrica dos sinais elétricos gerados pelas unidades motoras (UM) ativas dentro da área de registro do eletrodo 9 . A amplitude e a frequência do sinal EMG podem refletir a ativação e a velocidade de condução do potencial de ação nas UMs 10,11 , quantificados, respectivamente, pelo valor eficaz (root mean square -RMS) e frequência mediana (FM).…”
Section: Introductionunclassified