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Visceromotor response (VMR) determined by recording of the electromyography (EMG) of the abdominal muscle following graded colorectal distention (CRD, 10–80 mmHg, each 20 s). EMG was recorded before (Pre) or 24 h after (Post) colon distention (CD) of various levels (20, 30, and 40 mmHg) for different times (10, 20, and 40 min). N = 5 or 6. *P < 0.05 vs. the baseline level before the tonic distention.
