The immunological examination of 350 top level sportsmen has been made at different stages of training and competitions. This examination has revealed that the reaction of the immune system to superextreme loading can be divided into 4 phases: activation, compensation, decompensation and restoration. In the process of adaptation to increasing muscular loading, characteristic of modern competitive sport, the reserves of the immune system are mobilized, and the immunological characteristics are thus maintained at the initial level. In some of healthy adults the action of superextreme physical and psychoemotional loading produces the exhaustion of immunity reserves, which is manifested by the disappearance of certain classes of immunoglobulin from the blood and biological secretions 1-2 hours after the cessation of this action.
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