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Stretch reflex attenuation. Reflex responses were attenuated after several trials of stretching extensors (A–C) or flexors (D–F). In C and F, SR responses were normalized with respect to the mean rectified EMG activity before the stretch onset; *Significant difference: P < 0.001 in C and P = 0.002 in F. Calibration bars for EMG signals: 200 μV in A and 100 μV in D.
