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The circadian rhythms in blood hormone concentrations of 17 pituitary, adrenal, pancreatic, testicular, and thyroid hormones were determined in 9 women and 5 men 81 to 91 years of age. Six samples over a 24-hr span were studied for each hormone. Even with the small sample available, 9 of the 17 hormones determined showed a statistically significant circadian rhythm as a group phenomenon (prolactin, estradiol, 17-hydroxyprogesterone, insulin, C-peptide, thyroid stimulating hormone, aldosterone, cortisol, dehydroepiandrosterone sulfate). No rhythm detection by population mean cosinor analysis at the .05 level was obtained in this relatively small group of subjects for adrenocorticotropic hormone, follicle stimulating hormone, growth hormone, luteinizing hormone, triiodothyronine, thyroxine, progesterone (determined in women only) and testosterone (determined in men only).
D J Lakatua, and
G Y Nicolau, and
C Bogdan, and
E Petrescu, and
L L Sackett-Lundeen, and
P W Irvine, and
E Haus
March 1986,
Bollettino della Societa italiana di biologia sperimentale,
D J Lakatua, and
G Y Nicolau, and
C Bogdan, and
E Petrescu, and
L L Sackett-Lundeen, and
P W Irvine, and
E Haus
December 1990,
Scandinavian journal of clinical and laboratory investigation,
D J Lakatua, and
G Y Nicolau, and
C Bogdan, and
E Petrescu, and
L L Sackett-Lundeen, and
P W Irvine, and
E Haus
January 1987,
Progress in clinical and biological research,
D J Lakatua, and
G Y Nicolau, and
C Bogdan, and
E Petrescu, and
L L Sackett-Lundeen, and
P W Irvine, and
E Haus
March 2005,
Transplantation proceedings,
D J Lakatua, and
G Y Nicolau, and
C Bogdan, and
E Petrescu, and
L L Sackett-Lundeen, and
P W Irvine, and
E Haus
February 1995,
Atencion primaria,
D J Lakatua, and
G Y Nicolau, and
C Bogdan, and
E Petrescu, and
L L Sackett-Lundeen, and
P W Irvine, and
E Haus
March 2008,
Anales de medicina interna (Madrid, Spain : 1984),
D J Lakatua, and
G Y Nicolau, and
C Bogdan, and
E Petrescu, and
L L Sackett-Lundeen, and
P W Irvine, and
E Haus
October 1994,
The Journal of cardiovascular surgery,
D J Lakatua, and
G Y Nicolau, and
C Bogdan, and
E Petrescu, and
L L Sackett-Lundeen, and
P W Irvine, and
E Haus
September 2020,
Acta anaesthesiologica Scandinavica,
D J Lakatua, and
G Y Nicolau, and
C Bogdan, and
E Petrescu, and
L L Sackett-Lundeen, and
P W Irvine, and
E Haus
March 1979,
Ceskoslovenske zdravotnictvi,
D J Lakatua, and
G Y Nicolau, and
C Bogdan, and
E Petrescu, and
L L Sackett-Lundeen, and
P W Irvine, and
E Haus
December 1994,
Chronobiology international,
