Medium intensity exercise can increase the bodys resistance to infection, and the intensive training and competition can lower the bodys immunity.

中等强度运动可增加机体的抗感染能力，而大运动量训练和竞赛可降低机体的免疫力。

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This illuminates that the exercise of super-long time and medium intensity has a great influence on the hemorheological properties, which is possibly one of the reasons of sports ability falling.

提示，超长时间、中等强度运动对血液流变性的影响可能是导致耐力运动能力下降的原因之一。

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