Effects of rhGH on Body Composition and Subjective Physical Functions in Adults with Functional Growth Hormone Deficiency

BACKGROUND: There is a significant amount of evidence to indicate that some of the changes attributed to aging process can be partially reversed by GH replacement. But the GH replacement for somatopause with functional GH deficiency is still controversial. The aim of this study was to explore whether the short term GH replacement improved physical, emotional and sexual function as well as body composition. METHODS: A total of 31 adults with functional growth hormone deficiency were assigned to receive rhGH with an initial daily dose of 1.05 IU, six times a week. For evaluating physical change a 25-item questionnaire was administered to patients at initial visit and 6 months later. Body composition was determined by bioimpedence analysis at initial visit and 6 months later as well. We compared the changes for each variable using Wilcoxon's rank and Friedman's test. RESULTS: Serum IGF-1 level at 3 and 6 months were increased significantly by 31% and 43%, respectively, compared to baseline (P<0.0001). Lean body mass and percent body fat at 6 months of treatment showed a 2.2% increase and a 7.6% decrease with statistical significance. The score of the questionnaire at 6 months of treatment increased significantly in physical changes (P<0.0005), sexual function (P<0.001), self perception of physical appearances (P<0.02), chronic fatigue & immunity (P<0.03), and vitality (P<0.05). CONCLUSION: Adults with functional growth hormone deficiency showed improvements in not only body composition, but also physical function and appearances and sexual function after 6 months of treatment with rhHGH.

Assessment of GH Status with 24-Hour Urinary Growth Hormone Excretion in Peri- and Postmenopausal Women

BACKGROUND: Pharmacological stress tests for the diagnosis of GH deficiency are unpleasant, labor intensive and potentially dangerous. Reports on urinary GH measurement for the assessment of GH have been published after highly sensitive immunoassaies were developed. The aim of this study was to determine whether a 24- hour urine GH as an alternative method for GH assessment were reliable in predicting GH deficiency defined by L-dopa stimulation test. METHODS: Thirty women, ages 45 to 67, were studied. L-dopa stimulation tests were performed with an ingestion of 500 mg of L-dopa. Serum GH and IGF-1 were measured by a radioimmunoassay using commercially available reagents and uGH was estimated from the 24-hour urine. Then, the mean and its distribution of uGH values were compared according to the GH status defined by L-dopa stimulation test. RESULTS: The correlation between the uGH and the peak values after L-dopa stimulation test was significant (r=0.46; p<0.01). The mean value of uGH in the GH deficiency group was significantly lower than that of the normal group P<0.05). But because of the broad overlap of uGH in the two groups uGH showed no good separation GH deficiency from normal group although uGH reflects GH status significantly. CONCLUSION: uGH reflects GH status significantly, but because of broad overalp uGH couldn't separate GH deficiency form normal group defined by L-dopa stimulation test.

The Predictors of Growth Hormone Secretion after L-dopa Stimulation Test in Adults

BACKGROUND: Twenty four-hour GH secretion reaches a peak in puberty and declines by 14% every decade in adult life. By age 60, most adults have a total 24-hour secretion rate indistinguishable from those of hypopituitary patients with organic lesions in pituitary gland. We performed this study to know about the predictors of GH secretion after L-dopa stimulation test in adults. METHODS: One hundred and ninety eight patients over the age of 45, who visited the menopausal clinic from Oct. 2001 to May 2002, were studied. We compared the peak GH value after the administration of L-dopa 500 mg by gender and age groups. Also, we compared the GH deficiency group to normal by anthropometric and measured variables. RESULTS: The mean of the stimulated GH peak value and the prevalence rate of growth hormone deficiency were greater in women than in men. GH-AUC after L-dopa stimulation correlated well with all measurements of adiposity. In GH deficiency group, the mean values of measured variables about adiposity were greater than normal in statistical significance. Logistic regression test revealed sex and abdominal obesity contributed significantly to predict GH deficiency after L-dopa stimulation test. The odds ratio of GH deficiency were 3.0 in women compared to men with 2.9 in abdominal obesity. CONCLUSION: Gender and adiposity were the predictors of GH deficiency in adults after L-dopa stimulation test rather than age and IGF-1 values.