“When prolonged, excessive training stresses are applied concurrent with inadequate recovery, performance decrements and chronic maladaptations occur. Known as the overtraining syndrome (OTS), this complex condition afflicts a large percentage of athletes at least once during their careers. There is no objective biomarker for OTS and the underlying mechanism is unknown.”
See: The Unknown Mechanism of the Overtraining Syndrome in: Sports Medicine, March 2002, Volume 32, Issue 3, pp 185–209
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