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Normal growth in children is regulated to a great extent through the actions of the GH/IGF-I axis, a system consisting of GH and its mediators (ternary complex) that modulate growth in many tissues. The ternary complex (IGF-I/IGFBP-3/ALS) provides an acute regulatory mechanism in which IGF-I may be mobilized from the circulating reservoir of 150 kDa complexes to the tissues. Acute exercise is known to be a stimulus for GH secretion. The beneficial effects of scheduled exercise on body composition are also well established. However, the impact of strenuous exercise on the pubertal development of child athletes is still not well understood. The first goal of this study was to assess the acute effects of high intensity exercise training on GH-dependent ternary complex components in female rhythmic gymnasts compared to age-matched healthy female controls with normal physical activity. The second goal was to explore the influence of these exercise-induced changes on skeletal and pubertal growth in the same group prospectively over a period of 4 years.

journal of pediatric endocrinology and metabolism

Alterations in Serum Growth Hormone (GH)/GH Dependent Ternary Complex Components (IGF-I, IGFBP-3, ALS, IGF-I/IGFBP-3 Molar Ratio) and the Influence of these Alterations on Growth Pattern in Female Rhythmic Gymnasts