Decreased serum levels of oestradiol, testosterone and prolactin during prolonged physical strain and sleep deprivation, and the influence of a high calory diet
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The changes in oestradiol, testosterone and prolactin, and the effects of a high calory diet, were investigated in eleven young male cadets participating in a 5 days' ranger training course involving heavy and continuous physical activities with less than 1500 kcal·day−1 and almost without sleep.
Prolactin decreased continuously during the first 24 h to 25% of precourse values. Testosterone decreased during the day time and reached below 25% of precourse values after 48 h. Oestradiol did not change during the first 48 h but then decreased to about 50% of precourse values. In conclusion, oestradiol, testosterone and prolactin are strongly reduced during prolonged strain. These changes were not reversed by a high calory diet.
Key wordsPhysical exercise Calory deficiency Sleep deprivation Stress Prolactin Testosterone Oestradiol
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