Is physical exercise harmful?
It is thought that there is nothing healthier than sport and exercise. According to some Soviet scientists, however, we might be wrong. The Soviets have conducted a series of studies to analyze the influence of physical and emotional stress on the immunity of athletes. The exercises made to measure reinforce the immune system, but the excessive ones can reduce the antibodies to zero. These conclusions have been obtained through the analysis of blood samples drawn to athletes after competitions.
Subsequent studies indicated that the cause of this weakening of the immune system could be the existence of hormones such as insulin and serotonin. But adrenaline has the opposite effect. Short exercises, despite their hardness, raise the levels of adrenaline in blood and remain on the same level as antibodies. In a longer exercise, other hormones begin to work and the immune system weakens.
Therefore, the sport is beneficial, but like everything, made in its fair measure.
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