, Volume 17, Issue 4, pp 299-310

Simulation of the electric-control activity of the stomach by an array of relaxation oscillators

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Abstract

An array of bidirectionally coupled relaxation oscillators is proposed as a model of gastric electric-control activity. The characteristics of relaxation oscillators simulating control activity, such as intact and intrinsic frequency gradients and phase-lag patterns, were studied in anesthetized dogs. A marked intrinsic frequency gradient was found along the axis of the stomach, and a slight intrinsic frequency gradient around the circumference. The phase lag/cm decreased distally from the body of the stomach to the antrum. The model showed all these characteristics. Each oscillator in the array was represented by a system of two first-order nonlinear differential equations. The model was programmed on analog and hybrid computers.

Supported by the Medical Research Council of Canada, the Alberta Heart Foundation and the National Research Council of Canada.