Methods Rats were forced to do exhausting swimming, NAD of plasma, SOD and MDA of hepatic tissue were measured after 2 hours swimming.

• 方法采用大鼠力竭性游泳方式,于力竭游泳后2小时,观察大鼠血清NAD、肝组织中超氧化物歧化酶(SOD)和丙二醛(MDA)含量的变化。