Changes in motor unit activity of coactivated muscles during dynamic force field adaptation
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This study examines how motor unit (MU) activity changes during motor adaptation in dynamic environments. We show that reduced cocontraction during adaptation is primarily driven by increased agonist MU amplitude rather than firing rate changes. In contrast, antagonist MU activity remains stable. These findings highlight a shift in MU control strategy that optimizes force production while maintaining movement accuracy, providing new insights into the underlying neuromuscular mechanisms of motor adaptation.
