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Fig. 4. Graphs of the integrated EMG activity divided by change in pitch (mean
± s.e.m.) in the diaphragmaticus, ischiopubis and rectus abdominis
muscles for each alligator during a dive under three conditions; with no
weight added to the animal (gray bars), with weight equaling 2.5% of the
animal's body mass under the jaw (white bars), and with weight equaling 2.5%
of the animal's body mass on the base of the tail (black bars). Numbers
1–5 indicate the alligator that was used, followed by a L or R, which
indicates if the muscle on the left or right side, respectively, was used;
* significant treatment effect when comparing head weighted
to tail weighted dives (P
0.05); 
significant
treatment effect when comparing dives where no weighted was added to tail
weighted dives (P0.05). The values for integrated EMG activity
divided by the change in pitch should not be compared between animals or
muscles because of differences in electrodes, placement of electrodes, and
individual muscle activity.
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