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Fig. 4. (A) Distributions of the daily EMG amplitudes for the four muscles from one
rat over a 24 h recording period (thick line). Note that the ordinate is a
logarithmic scale. The lower maximum amplitude of the soleus was verified from
the raw EMG data and was typical for all rats. The thin black line shows the
distributions predicted for 20 min and the light gray shaded area 10 min of
locomotor-like activity. These predictions were based on the distribution of
EMG amplitudes recorded during a bout of phasic EMG activity (see
locomotor-like activity in Fig.
1). (B) Graphs of the total time that EMG activity exceeded the
amplitude level identified on the abscissa. Results from the six rats are
plotted as separate curves to show the consistency across animals. Note that
the Sol muscle had higher amplitudes for a greater amount of time and that the
TA clearly had lower amplitudes for a lesser amount of time compared to the
other muscles studied. The vertical dotted line in both (A) and (B) highlights
an EMG amplitude of 0.25 mV, to illustrate the duration of activity at this
relatively low amplitude. See text for details.
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