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AIM To explore gallbladder circadian rhythm (GCR) and the cholagogic action of Yin Chen Hao Ta(YCHT).METHODS Ultrasonography of rabbit gallbladder at 17:00 to 19:00, 23:00 to 01:00, 05:00 to 07:00 m11:00 to 13:00 showed its maximum area (MA), dilatation rate (GDR) and systole rate. Its movemecircadian rhythm (MCR) and the effect of YCHT on gallbladder and the relationship with time weobserved and evaluated.RESULTS The results showed that gallbladder area changed with time, which varied from 11:00 to 13:1>23:00 to 01:00 and 05:00 to 07:00> 17:00 to 19:00 (P<0.01, F=9.13 vs. control by analysisvariance). The cholagogic action at 23:00 to 01:00 and 17:00 to 19:00 was better than that at 11:00 to 13:and 05:00 to 07:00.CONCLUSION The gallbladder movement action (GMA) showed markedly circadian rhythm. Tcholagogic action of YCHT at 23:00 to 01:00 and 17:00 to 19:00 is better.
