Temporal relationship between prolactin secretion and slow-wave electroencephalic activity during sleep

It is well established that plasma prolactin (PRL) concentrations exhibit a sleep-dependent pattern, with the highest levels occurring during sleep and the lowest during waking. Still, controversy exists concerning an association between rapid eye movement (REM) and non-REM sleep cycles and plasma P...

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Bibliographic Details
Published in:Sleep (New York, N.Y.) N.Y.), 1995-09, Vol.18 (7), p.543-548
Main Authors: SPIEGEL, K, LUTHRINGER, R, FOLLENIUS, M, SCHALTENBRAND, N, MACHER, J. P, MUZET, A, BRANDENBERGER, G
Format: Article
Language:English
Subjects:
Adult
Alpha Rhythm
Beta Rhythm
Biological and medical sciences
Circadian Rhythm
Delta Rhythm
Electroencephalography
Fundamental and applied biological sciences. Psychology
Humans
Male
Prolactin - blood
Prolactin - secretion
Sleep - physiology
Sleep. Vigilance
Theta Rhythm
Time Factors
Vertebrates: nervous system and sense organs
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Summary:It is well established that plasma prolactin (PRL) concentrations exhibit a sleep-dependent pattern, with the highest levels occurring during sleep and the lowest during waking. Still, controversy exists concerning an association between rapid eye movement (REM) and non-REM sleep cycles and plasma PRL pulses. These studies were all based on conventional scoring of sleep stages. In the present study, plasma PRL concentrations were analyzed at 10-minute intervals in 10 subjects during the night when sleeping. PRL secretory rates were calculated by a deconvolution procedure. Spectral parameters of sleep electroencephalographic (EEG) recordings were analyzed together with PRL secretion using cross-correlation. Slow-wave activity of the EEG and PRL secretion ran parallel in all individuals. Conversely, alpha and beta bands and the EEG mean frequency were inversely proportional to PRL secretion. In 9 of the 10 subjects studied, PRL secretion was concomitant with delta waves or lagged behind by 10-20 minutes, depending on subjects, with maximum cross-correlation coefficients ranging between 0.40 and 0.67. This temporal relationship between PRL secretion and delta waves was further assessed by a pulse-by-pulse analysis based on the calculation of probability levels after computer simulations. Nine of the 10 subjects displayed significant concomitance between delta wave activity and PRL secretory oscillations. These results demonstrate that PRL secretion during sleep is coupled to delta waves in young healthy men.
ISSN:0161-8105
1550-9109
1550-9109
DOI:10.1093/sleep/18.7.543