By RIT, we study gastrointestinal hormone (gastrin and motilin), to observe hormone change of middle-distance racers in differ-load, we find that gastrin and motilin is increase with sport load, and dose-effect, same in rest state and litter load(P>0.05).

• 采用放射免疫技术和酶联免疫吸附法测定中长跑运动员不同运动负荷状态下血液中分泌型免疫球蛋白A(SIgA)和白细胞介素-2(IL-2)的变化；结果发现:小负荷、中负荷与安静状态相比SIgA显著升高(P<0.；05；P<0