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MU single and repetitive doublets during gentle voluntary muscle contractions in humans. (A) A doublet at motor unit recruitment. (B) A doublet among motor unit single-spike firing. (C) A doublet at motor unit de-recruitment. (D) A doublet of a motor unit with no background firing. (E) Motor unit repetitive doublet firing. (A) The triceps brachii. (B–E) The trapezius. Doublets are marked by asterisks. Time bar: 50 ms.
