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L5A_Maturation_and_Nutriiton_08 - Biology of Maturation and...

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Unformatted text preview: Biology of Maturation and Nutrition Adolescence Physically Sexually Period of maturation Psychologically Biology of Maturation and Nutrition Growth relationship to puberty Puberty and its mechanisms neuroendocrine regulation relationship to growth Role of nutrients in puberty Height gain for Adolescents Adolescence & Sexual Dimorphism Body Composition Onset of puberty & growth spurt Males more LBM Females more body fat Growth completion Earlier in females (1016) Later and longer in males (1218) Nutrient needs Earlier in females (18 years) Later in males (up to 2324 years) Iron needs greater in females Neuroendocrine Regulation of Sexual Maturity: Hypothalamic-Pituitary-Gonad Axis Ebling (2005)Reproduction 129: 675684. Prepubertal Block of Hypothalamic-PituitaryGonad Axis X Infant-childhood block Ebling (2005)Reproduction 129: 675-684. Timing & Maturation of Hypothalamic-PituitaryGonad Axis in Puberty Sisk & Foster (2004) Nature Neuroscience 7:1040. Neuroendocrine Regulation of Puberty Zn a Ebling (2005)Reproduction 129: 675684. Tanner's Stage of Maturation ( Sexual Maturation Rating) Stage 1 2 3 Characteristics Immature; childhood Pubic hair &genital development; breast bud in female Pubic hair & genital development; breast development in female 4 5 Pubic hair, genital and breast development Mature adult Interaction of GH & Sex Steroids in Pubertal Growth Puberty increases growth Peak precedes menarche Increased GH & Igf1 Nocturnal pulsatile secretion Increased GnRH and sex steroids Nocturnal pulsatile secretions Sex steroids augment GH pulsatile secretion Estrogen important for skeletal growth & maturation Growth and Development in Adolescents Girls Boys Nutrition & Maturation Nutritional status influences onset of puberty energy critical body fat & leptin? Neuropeptide Y Selected specific nutrients are important Zn ...
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