Plasma Melatonin Rhythm in Disorders of Puberty: Interactions of Age and Pubertal Stages

1991 ◽  
Vol 36 (1-2) ◽  
pp. 16-21 ◽  
Author(s):  
A. Cavallo
Keyword(s):  
Melatonin Rhythm ◽  
Plasma Melatonin ◽  
Pubertal Stages

Physical exercise accelerates reentrainment of human sleep-wake cycle but not of plasma melatonin rhythm to 8-h phase-advanced sleep schedule

2010 ◽  
Vol 298 (3) ◽  
pp. R681-R691 ◽  
Author(s):  
Yujiro Yamanaka ◽  
Satoko Hashimoto ◽  
Yusuke Tanahashi ◽  
Shin-ya Nishide ◽  
Sato Honma ◽  
...  
Keyword(s):  
Circadian Rhythms ◽  
Physical Exercise ◽  
Sleep Onset ◽  
Exercise Group ◽  
Control Group ◽  
Temporal Isolation ◽  
Melatonin Rhythm ◽  
Plasma Melatonin ◽  
Shift Schedule ◽  
Sleep Schedule

Effects of timed physical exercise were examined on the reentrainment of sleep-wake cycle and circadian rhythms to an 8-h phase-advanced sleep schedule. Seventeen male adults spent 12 days in a temporal isolation facility with dim light conditions (<10 lux). The sleep schedule was phase-advanced by 8 h from their habitual sleep times for 4 days, which was followed by a free-run session for 6 days, during which the subjects were deprived of time cues. During the shift schedule, the exercise group ( n = 9) performed physical exercise with a bicycle ergometer in the early and middle waking period for 2 h each. The control group ( n = 8) sat on a chair at those times. Their sleep-wake cycles were monitored every day by polysomnography and/or weight sensor equipped with a bed. The circadian rhythm in plasma melatonin was measured on the baseline day before phase shift: on the 4th day of shift schedule and the 5th day of free-run. As a result, the sleep-onset on the first day of free-run in the exercise group was significantly phase-advanced from that in the control and from the baseline. On the other hand, the circadian melatonin rhythm was significantly phase-delayed in the both groups, showing internal desynchronization of the circadian rhythms. The sleep-wake cycle resynchronized to the melatonin rhythm by either phase-advance or phase-delay shifts in the free-run session. These findings indicate that the reentrainment of the sleep-wake cycle to a phase-advanced schedule occurs independent of the circadian pacemaker and is accelerated by timed physical exercise.

A Chronobiological Study of Melatonin, Cortisol Growth Hormone and Prolactin Secretion in Cluster Headache

Cephalalgia ◽  
1984 ◽  
Vol 4 (4) ◽  
pp. 213-220 ◽  
Author(s):  
Guy Chazot ◽  
Bruno Claustrat ◽  
Jocelyne Brun ◽  
Daniel Jordan ◽  
Geneviève Sassolas ◽  
...  
Keyword(s):  
Growth Hormone ◽  
Cluster Headache ◽  
Prolactin Secretion ◽  
Temporal Organization ◽  
Plasma Prolactin ◽  
Melatonin Rhythm ◽  
Plasma Melatonin ◽  
Sleep Recording ◽  
Plasma Gh ◽  
Headache Patients

The temporal organization of plasma melatonin. cortisol. growth hormone (GH) and prolactin secretion was examined in healthy rested controls and in patients suffering from episodic cluster headache. Eleven patients with typical cluster headache (10 men, 1 female) and 8 male controls were studied over a 24–h period: blood was collected at 2–h intervals during the day and at l-h intervals at night. Plasma melatonin. cortisol, GH and prolactin levels were determined by radioimmunoassay. Most of the cluster headache patients showed a decrease in nocturnal melatonin secretion and the melatonin rhythm was even completely abolished in one patient. Chronobiological analysis of the cluster headache patients' 24–h plasma melatonin profile showed a significant decrease in amplitude and mesor: these were 58.7 pg/ml and 34.4 pg/ml respectively in control subjects, versus 18.7 pg/ml and 17.6 pg/ml for the patients. In addition. patients showed a significant phase-advance in their melatonin rhythm For cortisol, the rhythm appeared slightly blunted in the cluster headache group and was significantly phase-advanced. The plasma prolactin profile showed no significant alteration, but for plasma GH the nocturnal peak was advanced in some patients: in the absence of sleep recording, however, no conclusion could be drawn. Results from this study suggest a neuroendocrine dysregulation in cluster headache in the endogenous clock which controls the pineal rhythmicity.

Midday exposure to bright light changes the circadian organization of plasma melatonin rhythm in humans

1997 ◽  
Vol 221 (2-3) ◽  
pp. 89-92 ◽  
Author(s):  
Satoko Hashimoto ◽  
Masako Kohsaka ◽  
Kouji Nakamura ◽  
Hiroshi Honma ◽  
Sato Honma ◽  
...  
Keyword(s):  
Bright Light ◽  
Melatonin Rhythm ◽  
Plasma Melatonin ◽  
Circadian Organization

scholarly journals Free-running of plasma melatonin rhythm prior to full manifestation of a non-24 hour sleep-wake syndrome

1998 ◽  
Vol 52 (2) ◽  
pp. 264-265 ◽  
Author(s):  
SATOKO HASHIMOTO ◽  
KOUJI NAKAMURA ◽  
SATO HONMA ◽  
KEN ICHI HONMA
Keyword(s):  
Melatonin Rhythm ◽  
Plasma Melatonin ◽  
Free Running

Plasma Melatonin Rhythm Lost in Preglaucomatous Chicks

1986 ◽  
Vol 2 (3) ◽  
pp. 205-213 ◽  
Author(s):  
JEAN K. LAUBER ◽  
TADASHI OISHI ◽  
JERRY VRIEND
Keyword(s):  
Melatonin Rhythm ◽  
Plasma Melatonin
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