Changing force response for activated muscle fibers.

<p>The root-mean-squared (RMS) amplitude for the initial driving oscillation (a) and the final driving oscillation (b) for activated muscle fibers. (c) The ratio of the initial and final RMS amplitudes for activated muscle fibers. The total length of the oscillation was 20 seconds. All data points are (MEAN±SEM), and the number of fibers analyzed was N = 8.