Decreased serum levels of oestradiol, testosterone and prolactin during prolonged physical strain and sleep deprivation, and the influence of a high calory diet

  • Per Kristian Opstad
  • AsbjØrn Aakvaag


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 words

Physical exercise Calory deficiency Sleep deprivation Stress Prolactin Testosterone Oestradiol 


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Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • Per Kristian Opstad
    • 1
  • AsbjØrn Aakvaag
    • 2
  1. 1.Division for ToxicologyNorwegian Defence Research EstablishmentKjellerNorway
  2. 2.Hormone and Isotope LaboratoryAker HospitalOsloNorway

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