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- W2017203118 abstract "ABSTRACT: To evaluate the role of growth hormone-releasing hormone (GHRH) in the physiologic release of growth hormone (GH) we studied the nocturnal secretion of immunoreactive GHRH (ir-GHRH) and its relationship to GH release and various stages of sleep in six prepubertal (three boys) and six pubertal children (two boys) with normal stature. Their ages ranged from 8.1 to 14.9 yr and their bone ages from 6.8 to 14.8 yr. Blood was withdrawn continuously between 2200-0600 h at a constant rate of 5 mL/20 min. The EEG was simultaneously registered. The ir-GHRH and GH data were analyzed by a discrete-pulse detection algorithm (Pulsar). The number of nocturnal ir- GHRH pulses varied from 0-8 (median 7) and the number of GH peaks from 2-6 (median 3). Pubertal children had significantly more (p < 0.05) ir-GHRH pulses and the pulse amplitude was higher (p < 0.05) than in the prepubertal children. There were no significant differences in the GH parameters between the two groups. The ir-GHRH peaks were not significantly related to any specific sleep stage. The majority of the GH pulses (71%) were associated with slow wave sleep (p < 0.001). Two-thirds (69%) of the GHRH peaks preceded closely or coincided with GH pulses (p < 0.02). Pubertal subjects had more isolated ir-GHRH peaks than prepubertal children (p < 0.05). We conclude that the nocturnal secretion of ir-GHRH is pulsatile and, assuming that the peripheral plasma concentrations of ir-GHRH reflect its release from the hypothalamus, GHRH appears to play a physiologic role in the regulation of GH secretion. The partial dissociation between ir-GHRH and GH pulses suggests that other factors are also involved in the regulation of episodic GH release and/or that some of the circulating ir-GHRH originates from extrahypothalamic sources. Pubertal children have increased ir-GHRH secretion, the importance of which remains to be defined." @default.
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- W2017203118 date "1989-11-01" @default.
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- W2017203118 title "Nocturnal Release of Immunoreactive Growth Hormone-Releasing Hormone and Growth Hormone in Normal Children" @default.
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- W2017203118 doi "https://doi.org/10.1203/00006450-198911000-00003" @default.
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