Measuring morning melatonin levels with plasma melatonin ELISA kits is a poor choice on two levels

2021 ◽  
Author(s):  
David J. Kennaway
Keyword(s):  
Plasma Melatonin

Pulsatile GnRH administration is attended by decreased plasma melatonin in patients suffering from GnRH deficiency

1989 ◽  
Vol 120 (3_Suppl) ◽  
pp. S50-S51
Author(s):  
R. P. WILLIG ◽  
J. C. COMMENTZ ◽  
N. STAHNKE
Keyword(s):  
Plasma Melatonin ◽  
Pulsatile Gnrh

The Effect of Moderate Weight Loss on Overnight Melatonin Secretion

1990 ◽  
Vol 156 (6) ◽  
pp. 875-877 ◽  
Author(s):  
I. M. Anderson ◽  
S. E. Gartside ◽  
P. J. Cowen
Keyword(s):  
Weight Loss ◽  
Melatonin Level ◽  
Melatonin Secretion ◽  
Plasma Melatonin ◽  
Healthy Women ◽  
Before And After

Overnight plasma melatonin level was measured in ten healthy women before and after a 4300 kJ (1000 kcaI) diet in which they lost an average 3.1 kg. This weight loss did not significantly alter melatonin levels.

Decreased nocturnal plasma melatonin peak in patients with estrogen receptor positive breast cancer

Science ◽  
1982 ◽  
Vol 216 (4549) ◽  
pp. 1003-1005 ◽  
Author(s):  
L Tamarkin ◽  
D Danforth ◽  
A Lichter ◽  
E DeMoss ◽  
M Cohen ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Estrogen Receptor ◽  
Plasma Melatonin ◽  
Estrogen Receptor Positive ◽  
Positive Breast Cancer

Effects of 1800-MHz Radiofrequency Fields on Circadian Rhythm of Plasma Melatonin and Testosterone in Male Rats

2012 ◽  
Vol 75 (18) ◽  
pp. 1120-1128 ◽  
Author(s):  
Fenju Qin ◽  
Jie Zhang ◽  
Honglong Cao ◽  
Cao Yi ◽  
Jian Xiang Li ◽  
...  
Keyword(s):  
Circadian Rhythm ◽  
Male Rats ◽  
Plasma Melatonin

scholarly journals Plasma Melatonin Rhythms in Euthermic Marmots (Marmota flaviventris)

1984 ◽  
Vol 30 (2) ◽  
pp. 332-337 ◽  
Author(s):  
Gregory L. Florant ◽  
Lawrence Tamarkin
Keyword(s):  
Marmota Flaviventris ◽  
Plasma Melatonin

Annual changes in 6-sulphatoxymelatonin excretion in man

1988 ◽  
Vol 117 (4) ◽  
pp. 470-476 ◽  
Author(s):  
Christopher J. Bojkowski ◽  
Josephine Arendt
Keyword(s):  
Intermediate Phase ◽  
Urine Samples ◽  
Plasma Samples ◽  
Annual Change ◽  
Melatonin Secretion ◽  
Normal Volunteers ◽  
Plasma Melatonin ◽  
Annual Rhythm ◽  
Major Urinary Metabolite ◽  
Annual Changes

Abstract: A recently developed RIA for 6-sulphatoxymelatonin, the major urinary metabolite of melatonin, has been used to investigate the annual change in melatonin secretion in humans. Twenty plasma samples were taken from 18 volunteers throughout a 24-h period and simultaneous 6-hourly urine samples were also collected. Plasma melatonin and urinary 6-sulphatoxymelatonin were measured by RIA. 6-Sulphatoxymelatonin assayed in the urine samples was shown to be a good index of the rhythmic characteristics of the plasma melatonin secretion. To study annual changes in excretion four sequential 6-hourly urine samples were collected at monthly intervals from 16 normal volunteers for 13 months. Cosinor curves were fitted to the 6-sulphatoxymelatonin excretion data and the 24-h rhythm was described by the cosinor parameters: amplitude, mesor and acrophase. Significant differences in the acrophase were found during the year. The summer acrophase was phase advanced relative to the winter acrophase by about 1.5 h while intermediate phase positions were observed in spring/autumn. The 24-h excretion of urinary 6-sulphatoxymelatonin was remarkably consistent and there was no annual rhythm. In contrast, the daytime 6-sulphatoxymelatonin excretion between 12.00–18.00 h showed a statistically significant seasonal rhythm, with peaks in December/January and in July.

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