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A and B: median power frequency for muscle force (solid lines) and mean of all active single motor unit forces (dashed lines) when the contraction times were multiplied by 0.5 (A) or 2 (B). C and D: average peak correlations between the fluctuations in force and low-pass filtered CST (cutoff frequencies of 3, 6, 9, 12, and 15 Hz) for target forces from 0.5% to 20% MVC for simulations with the contraction times multiplied by 0.5 (C) or 2 (D).
