Triceps surae stretch and voluntary contraction alters maximal M-wave magnitude

Tucker, Kylie; Türker, Kemal S.

doi:10.1016/j.jelekin.2005.12.006

Cited by 12 publications

(9 citation statements)

References 36 publications

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“…The peak-to-peak amplitude of supramaximal M-waves (M max ) is affected by joint angle [19]. Therefore, three M max were elicited at both 1018 and 1558 knee angles, and the average M max at each angle was used to normalize volitional agonist EMG in these conditions.…”

Section: Methodsmentioning

confidence: 99%

Contraction type influences the human ability to use the available torque capacity of skeletal muscle during explosive efforts

2012

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The influence of contraction type on the human ability to use the torque capacity of skeletal muscle during explosive efforts has not been documented. Fourteen male participants completed explosive voluntary contractions of the knee extensors in four separate conditions: concentric (CON) and eccentric (ECC); and isometric at two knee angles (1018, ISO101 and 1558, ISO155). In each condition, torque was measured at 25 ms intervals up to 150 ms from torque onset, and then normalized to the maximum voluntary torque (MVT) specific to that joint angle and angular velocity. Explosive voluntary torque after 50 ms in each condition was also expressed as a percentage of torque generated after 50 ms during a supramaximal 300 Hz electrically evoked octet in the same condition. Explosive voluntary torque normalized to MVT was more than 60 per cent larger in CON than any other condition after the initial 25 ms. The percentage of evoked torque expressed after 50 ms of the explosive voluntary contractions was also greatest in CON (ANOVA; p , 0.001), suggesting higher concentric volitional activation. This was confirmed by greater agonist electromyography normalized to M max (recorded during the explosive voluntary contractions) in CON. These results provide novel evidence that the ability to use the muscle's torque capacity explosively is influenced by contraction type, with concentric contractions being more conducive to explosive performance due to a more effective neural strategy.

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Section: Methodsmentioning

confidence: 99%

Contraction type influences the human ability to use the available torque capacity of skeletal muscle during explosive efforts

2012

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“…The M max can also be used to evaluate the proportion of the entire motoneuron pool activated by the group Ia afferents by calculation of the H max /M max ratio [16]. In order to avoid any potential systemic changes that affect all parameters in the trials, it is recommended to record the M max under the respective testing conditions as a reference [29].…”

Section: Stimulation Parametersmentioning

confidence: 99%

Soleus H-reflex and its relation to static postural control

Chen

Zhou

2011

Gait & Posture

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“…However, the electrode configuration in this study is the same as that reported elsewhere [10,13,15]. In addition, in terms of the exist data, there were no significant differences between the G1-MG2 and BG2-MG2 (Fig.…”

Section: Discussionmentioning

confidence: 52%

“…This observation provides an important clarification for any meaningful comparison of the results of the monopolar and bipolar sEMG methods. The underlying principle of the monopolar sEMG system is to place the G2 electrode over the tendon of the tested muscle, which is unexcitable tissue [10,13,15]. The hypothesis is, therefore, that signal cancellation is avoided at the monopolar sEMG.…”

Section: Discussionmentioning

confidence: 99%