Seasonal patterns of sleep stages and secretion of cortisol and growth hormone during 24 hour periods in northern Norway.
Weitzman ED; Graaf AS; Sassin JF; Hansen T; Godtlibsen OB; Perlow M; Hellman L
Acta Endocrinol 1975 Jan; 78(1):65-76
A group of 7 male subjects was studied in regard to sleep stages and 24 hour plasma cortisol (50237) and growth-hormone (9002726) patterns during the 4 seasons of the year in northern Norway. No difference in total sleep or sleep stage percents was found for any of the seasons. A small, statistically significant increase in mean plasma cortisol concentration and amount secreted for 24 hours was found for autumn and winter. All subjects secreted growth-hormone shortly after sleep onset at night, and no difference was found as a function of season of the year.
NIOSH-Publication; NIOSH-Grant; Grants-other; Endocrine-system; Circadian-rhythms; Blood-chemistry
Division of Neurology Montefiore Hosp and Med Center Division of Neurology Bronx, NY 10467
Other Occupational Concerns; Grants-other
Montefiore Hospital and Medical Center, New York, New York