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Typical raw data showing motor unit potentials (MUPs) recorded by intramuscular EMG. The MUPs were recorded from an older power athlete holding a sustained isometric contraction at 25% MVC. (A) MUPs from populations of active motor units. (B) Data from A shown with a reduced time window to reveal more detail. (C) A Single MUP isolated from the traces shown in B. (D) Traces of the same MUP overlaid from consecutive firing.
