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Journal of Clinical Endocrinology & Metabolism, Vol 72, 854-861, Copyright © 1991 by Endocrine Society
ARTICLES |
RW Holl, ML Hartman, JD Veldhuis, WM Taylor and MO Thorner
Department of Medicine, University of Virginia Health Sciences Center, Charlottesville 22908.
Both fasting and sleep increase the secretion of human GH and, therefore, might explain its predominantly nocturnal release. To study the precise temporal relationship between GH secretory episodes and cortical activity, GH measurements and electroencephalogram sleep stage recordings were performed every 30 s for 8 h in six young male volunteers fasted for 24 h. GH was measured in two drops of whole blood, which were directly sampled into the assay tube using a continuous blood withdrawal pump and a fraction collector. Concomitant serum sampling during a GH-releasing hormone test (n = 4) revealed a high correlation (r = 0.98) between GH measurements in serum and whole blood. GH pulses were objectively identified with Cluster analysis, and GH secretion rates were calculated with a waveform-independent deconvolution algorithm. When data were analyzed as replicates with 1- min intervals, the nocturnal pulse frequency was 1.2 pulses/h. Elimination of data points demonstrated 43% and 64% reductions in the number of GH pulses detected for 5- and 20-min sampling intervals, respectively. Mean GH concentrations and secretory rates were significantly higher during stage 3 and 4 sleep compared to stage 1, 2, and rapid eye movement sleep. GH secretory rates and peripheral GH concentrations were maximally correlated with sleep stage, with lags of 4.5 and 16 min, respectively, suggesting that maximal GH release occurs within minutes of the onset of stage 3 or 4 sleep. This temporal coincidence between pituitary GH secretion and delta sleep is consistent with cortical control over hypothalamic-pituitary function.
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