Abstract: To investigate the effects of betacyanins extracted from Suaeda salsa L. on skeletal muscular fatigue. Toad gastrocnemius was stimulated by pulse electric curent. The results showed that betacyanins extracted from Suaeda salsa L. at concentrations of 0.005, 0.01, 0.02 mg/mL could prolong the time of contraction amplitude decreasing to 90%, 50% and 10% of the maximum contraction amplitude(in vitro,P<0.05). And 0.02 mg/mL could prolong the time of contraction amplitude decreasing to 90%, 50% and 10% of the maximum contraction amplitude too(in vivo, P<0.01). Therefore,the study showed that betacyanins extracted from Suaeda salsa L. had effect on antifatigue.

Key words: Suaeda salsa L.; betacyanins; toad gastrocnemius; muscular fatigue