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Electromyographical (EMG) activities of visceromotor response to colorectal distension (CRD). EMG activities in the external oblique muscle in response to graded CRD (distention volume: 0.1, 0.2, 0.3, and 0.4 mL) were measured in rats. Red wavy line represents a typical electromyography of corresponding groups (mean ± SEM, n = 6, ∗P < 0.05).
