Plasma human growth hormone levels 4 hours after breakfast in adolescent twins and adults.

Human Growth Hormone (HGH) levels in plasma were shown to be elevated 4-5 hrs. after the subjects were given 100g. of glucose orally (Roth et al., 1963b; Roth et al., 1964) or 3-4 hrs. after having mixed meals (Hunter et al., 1966a). It was observed that plasma taken from children and adolescents 2-3 hrs. (Greenwood et al., 1964) or 3-4 hrs. (Hunter and Rigal, 1966b) after the meals contained a larger dose of HGH than that taken from adults under the same conditions. This communication deals with our study in which the plasma HGH levels were determined 4 hrs. after the groups of young twins and adults were given the test breakfast and the determined values were considered in correlation with the age, sex, and body height and weight of each subject. A comparison between individual twins was also made.