title: Decreased serum levels of oestradiol, testosterone and prolactin during prolonged physical strain and sleep deprivation, and the influence of a high calorie diet.
abstract: The changes in oestradiol, testosterone and prolactin, and the effects of a high calorie diet, were investigated in eleven young males 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 calorie diet.
mesh_terms: D000328:Adult; D004032:Diet; D002149:Energy Intake; D004958:Estradiol / Q000097:blood*; D006801:Humans; D005082:Physical Exertion; D011388:Prolactin / Q000097:blood*; D012892:Sleep Deprivation / Q000502:physiology*; D013739:Testosterone / Q000097:blood*; D013997:Time Factors
chemical_list: D013739:Testosterone; D004958:Estradiol; D011388:Prolactin