ELECTRICAL AND CONTRACTILE ACTIVITIES OF THE NORMAL CANINE STOMACH

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Ten mongrel dogs equipped with four bipolar electrodes and three waterproof strain gauges were used for experiments. In fasting, mean discharge interval of BER of stomach ranged from 10.8 sec. to 13.7 sec., Following feeding, discharge interval of BER showed a considerable prolongation ranging from 13% to 37% dur-ing the initial 60 minutes, and from 4.4% to 23% during the next 9 hour postprandial period. Propagation velocity of BER was almost constant in each animal, however the velocity showed a tendency to decrease slightly following feeding. The velocity in the corpus, antrum and prepyloric area was 0.4 cm/sec., 1.0cm/sec. and 1.5cm/ sec., respectively. Irregegular electrical activities (dysrhythmias) were observed in the antrum most frequently, although their incidence was less than 2% in total dura-tion during the entire observation period. In postprandial period, the contractile activities of the corpus showed a somewhat monotonic pattern with a steady amplitude. The contractile activities of the antrum and the pyloric sphincter showed a waxing and waning pattern with a varying amplitude. Characteristically, the pyloric sphincter showed an intermittent relaxing phase much more frequently as compared with the antrum.