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A: average maximum forces produced by the index (I), middle (M), ring (R), little (L), and four-finger (IMRL) combinations of the Young participants in the MVC tasks. B: average maximum forces produced by the Elderly participants. C: index of enslaving (E) for the Young and Elderly groups. Values are means ± SE. ★, Main effect of fatigue; +, fatigue × group interaction.
