The effect of an 1100 km run on testicular, adrenal and thyroid hormones

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Abstract
Although endocrine effects of physical or psychological stress are well documented, it is not known to what extent adaptation to prolonged exertion occurs. The impact of an 1100-km run of 20 days'' duration on selected pituitary, testicular, adrenal and thyroid hormones was investigated. Blood samples were obtained from 5 male athletes prior to and after the day''s run on the 1st, 5th, 9th, 14th and 19th day. Adrenal and thyroid function soon adapt to the daily strain. Testosterone levels were markedly decreased throughout the 20 days while LH [luteinizing hormone] levels remained unchanged. It appears that the reproductive endocrine system is more susceptable to long-term stress effects than the more vital functions of the thyroid and adrenal glands.

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