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Representations of the experimental set-up and recorded electromyography (EMG). A: schematic of the dynamometer. B: motor unit (MU) potential overlay of the monopolar needle EMG and force tracing during an isometric maximal voluntary contraction (MVC) of an old participant (82 yr). C: surface EMG and concentric needle EMG during 15% of MVC. LC, load cell. Scale bars are associated with the EMG and force tracings.
