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Group mean force output (A) and rate of change of force (B) are plotted against the target force level used in each trial. Mean force output was slightly higher than the target for the 5% condition and slightly lower than the target for the 80% condition. Nevertheless, the subjects were able to effectively produce force close to the target force level during each of the 5 conditions. Between-subject variance was larger for the rate of change of force than the amplitude of force.
