A systematic review of muscle activity assessment of the biceps brachii muscle using mechanomyography.

J Musculoskelet Neuronal Interact · 2018 · PMC6313049 · PMID 30511949

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a decreasing trendno p-value reported

After the development of fatigue in the BB muscle, the MMG RMS showed a decreasing trend, while the MMG MPF values shifted to a lower scale.

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an increasing trendno p-value reported

At a lower level of sustained muscle contraction under fatiguing conditions, such as approximately 20% MVC, the MMG RMS shows an increasing trend[ 32 - 34 ], and an opposite trend in the amplitude of the MMG signal was found in two previous studies[ 32 , 41 ].

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.