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• W1669652865 abstract "To assess the spectrum of LH pulse characteristics in normal men, blood samples from 36 individuals were drawn at 20-minute intervals for 8 hours. The subsequent immunoactive LH concentrations were analyzed by computer algorithms to delineate the frequency and amplitude characteristics of pulsatile LH secretion. The absolute range for LH pulse frequency estimated by a modified threshold method was 1-6 pulses/8 hr, with a mean (+/- SEM) of 3.36 +/- 0.17 (median -3)pulses/8 hr. The distribution differed significantly from a Gaussian pattern. The mean LH pulse amplitude expressed as a percent increase above nadir was 92.1 +/- 6.1 (median-91.5%). When LH pulse amplitude was defined as an increment (mIU/ml) above nadir, the mean value was 5.13 +/- 0.4 (median -4.8) mIU/ml. These two expressions of amplitude were positively correlated (P less than 0.01), while the incremental (mIU/ml) pulse amplitude correlated inversely with pulse frequency (P less than 0.01). To examine the influence of more intensified rates of venous sampling on the spectrum of LH pulse properties, blood was sampled at 4-minute intervals for 8 hours in a subgroup of 13 men. Under these conditions, estimated LH pulse frequency was significantly higher, with a mean of 10.31 +/- 1.87 (median -9) pulses/8 hr compared with 20-minute sampling in the same individuals (P less than 0.001). Although the estimates of LH pulse frequency at 4-minute and 20-minute sampling intervals were significantly correlated (P less than 0.01), the dispersion of the LH pulse frequency estimates was considerably larger at more rapid rates of sampling. There was an absolute range of 2-20 pulses/8 hr for the 4-minute sampling, and 1-6 pulses/8 hr for the 20-minute sampling in the same individuals. This increase in LH pulse frequency and the broader dispersion of the range of frequencies estimated at 4-minute compared with 20-minute sampling intervals were confirmed using either another pulse detection algorithm, or separate criteria designed to adjust false-positive error rates in relation to sampling intensity. It was concluded that eugonadal men exhibit a broad spectrum of pulsatile LH characteristics, and the range of LH pulse attributes is even greater at more intensive rates of venous sampling. The results of this study in normal men demonstrate that a wider dispersion of physiologic LH pulse characteristics must be recognized in man.(ABSTRACT TRUNCATED AT 400 WORDS)" @default.
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• W1669652865 date "1986-03-04" @default.
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• W1669652865 title "Spectrum of the Pulsatile Characteristics of LH Release in Normal Men" @default.
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• W1669652865 doi "https://doi.org/10.1002/j.1939-4640.1986.tb00885.x" @default.
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