한국인 정상 성인에서 성장호르몬의 분비능

Objectives: Growth hormone secretory capacity of adults decrease with aging, Growth hormone secretory capacity and prevalence of growth hormone deficiency in Korean adults were studied. Methods: History, physical examination, and routine blood tests were performed to roule out ill patients among ordinary subjects. Anthropometry, nutritional history, serum insulin-like growth factor-1 (IGF-1) levels, L-dopa stimulation tests, and urinary growth hormone levels were measured in 309 Korean adults, ages 20-87 years. Results: The mean serum IGF-1 levels were 258,2+6. 8 ng/ml. The mean serum IGF-1 levels of adult males were significantly higher than those of the females. The serum IGF-1 levels decreased with aging. The prevalence of growth hormone deficiency defined by serum IGF-1 levels (< 150 ng/ml) were 0.0% in the 3rd decade, 5.5% in the 4th decade, 12.2% in the 5th decade, 10.0% in the 6th decade, 32.1% in the 7th decade, 48.1% in the 8th decade, respectively. The serum IGF-1 levels were positively correlated with total energy expenditure, but negatively correlated with body fat mass. The peak serum growth hormone levels after L-dopa stimulation and urinary growth hormone levels of the younger subjects were significantly higher than those of the older subjects, There were goad correlations among serum IGF-1 levels, peak growth hormone levels after L-dopa stimulation, and urinary growth hormone levels. Conclusion: Growth hormone secretory capacity decreased significantly with aging, and growth hormone deficiency was found in about 1/3 of subjects aged over 60 years.