2019
DOI: 10.1111/ejn.14488
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Investigating the effects of muscle contraction and conditioning stimulus intensity on short‐interval intracortical inhibition

Abstract: A reduction in short‐interval intracortical inhibition (SICI) has been shown to accompany acute or chronic resistance exercise; however, little is known about how SICI is modulated under different contraction intensities. Therefore, the purpose of this study was to assess the effect of muscle contraction and conditioning stimulus intensity on the modulation of SICI. Single‐ and paired‐pulse transcranial magnetic stimulation was applied to the primary motor cortex (M1), and motor evoked potentials (MEPs) were r… Show more

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Cited by 9 publications
(9 citation statements)
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“…These results are therefore similar to those obtained in studies that evaluate SICI with no account of the proportion of motoneurones activated by the TS. Indeed, it is known that voluntary muscle contraction reduced SICI MEPtest [ 16 , 27 ], particularly when tested with high levels of muscle contraction (>40% MVIC) [ 17 , 19 ]. One explanation is that during high levels of voluntary muscle contraction, the excitability of the spinal motoneurones pool is increased and the later indirect waves (called I3) generated by the TS (fixed to induce 1 mV MEP amplitude in the majority of previous studies) no longer contribute to the production of the MEP test [ 28 ].…”
Section: Discussionmentioning
confidence: 99%
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“…These results are therefore similar to those obtained in studies that evaluate SICI with no account of the proportion of motoneurones activated by the TS. Indeed, it is known that voluntary muscle contraction reduced SICI MEPtest [ 16 , 27 ], particularly when tested with high levels of muscle contraction (>40% MVIC) [ 17 , 19 ]. One explanation is that during high levels of voluntary muscle contraction, the excitability of the spinal motoneurones pool is increased and the later indirect waves (called I3) generated by the TS (fixed to induce 1 mV MEP amplitude in the majority of previous studies) no longer contribute to the production of the MEP test [ 28 ].…”
Section: Discussionmentioning
confidence: 99%
“…Importantly, with low levels of muscle contraction [ 17 , 19 ] or different MEP test amplitudes evoked at 120 or 130% of MT [ 11 , 32 ], the amount of SICI MEPtest remains unchanged. As mentioned by Lackmy and Marchand-Pauvert (2010), this result seems logical from a purely mathematical point of view given the linear relationship between the MEP cond and MEP test amplitudes [ 9 ].…”
Section: Discussionmentioning
confidence: 99%
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