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The effect of shoulder position on motor evoked and maximal muscle compound action potentials of the biceps brachii.
Neuroscience Letters 2018 Februrary 6
The purpose of the study was to assess the effect of shoulder position, 0° versus 90° shoulder flexion, on stimulation intensity and maximal muscle compound action potentials (Mmax ) and motor evoked potentials (MEP) of the biceps brachii during both rest and 10% maximum voluntary contraction (MVC). Nine participants completed two experimental sessions with four conditions. During each condition, transcranial magnetic (TMS) and Erb's point stimulation were used to elicit MEPs and Mmax , respectively. During rest, the TMS intensity to elicit a MEP response (p<0.001), was significantly lower by 28.6±6.8%, in the 90° compared to the 0° position, but the stimulation intensity to elicit a Mmax was not different. MEP (p<0.001) and Mmax (p<0.001) amplitudes were significantly higher by 212.4±43.3% and 86.5±38.0%, respectively in the 90° compared to the 0° position. During 10% MVC the Mmax stimulation intensity (p=0.022), but not TMS intensity, was significantly lower by 7.4±3.8% in the 90° compared to the 0° position. Mmax (p<0.001) amplitudes were significantly higher by 92.2±20.2% in the 90° compared to the 0° position whereas MEP (p<0.001) amplitudes were significantly lower by 24.5±6.0% in the 90° compared to the 0° position. In conclusion, TMS intensity and Mmax intensity were both shoulder-position and state-dependent, whereas MEP and Mmax amplitudes were only shoulder position-dependent.
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