By Dennis J. Caine, Keith Russell, Liesbeth Lim(eds.)
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Additional info for Gymnastics
FSH promotes development of the Sertoli cells and seminiferous tubules, which comprise the majority of the testicular volume. Testicular volume increases from 1–3 mL before puberty up to 15–25 mL in adulthood. Spermatogenesis begins early in pubertal development, between Tanner stages 2 and 3, although normal sperm concentration, morphology, and motility are often not established until the end of puberty. Throughout puberty in males, a portion of testosterone and androstenedione is converted to estradiol, which plays a major role in the promotion of body growth (see next section).
4). 1 Tanner stages of pubertal maturation. 4 Hypothalamic-pituitary-gonadal (HPG) axis in males (left) and females (right). Gonadotropin releasing hormone (GnRH) stimulates pituitary release of the gonadotropins [luteinizing hormone (LH) and follicle stimulating hormone (FSH)]. LH is the primary stimulus for testicular testosterone secretion, while both FSH and LH are required for normal ovarian estradiol production. In males, testosterone provides negative feedback for LH secretion, while inhibin suppresses FSH release.
Short-term longitudinal studies of athletes in several sports in which the same youngsters are followed on a regular basis over time (volleyball, diving, distance running, basketball) indicate rates of growth in height that, on average, closely approximate rates observed in nonathletic children and adolescents. The growth rates observed were within the range of normally expected variation among youth. Studies investigating the interactions between club-level sports training for gymnasts, figure skaters, and runners, compared to controls, found that club-level sports training did not affect growth or maturation during puberty.