Male (N = 17) college tennis and table tennis players were studied before, during, and after a five-day sports competition.
Most blood and urine factors showed changes ranging from 0% - 36%, but all remained within a normal range. Post-competition cortisol, dopamine, IgA, and IgG dropped significantly, and calcium and A/G ratio values increased significantly when compared to precompetition levels.
Implication. Some biochemical factors change during extended competitions, but do not affect short-term health.