NFS 143 Normal Adolescent Nutrition
NFS 143 Normal Adolescent Nutrition NFS 143
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This 1 page Class Notes was uploaded by Grace Cotrupi on Monday October 3, 2016. The Class Notes belongs to NFS 143 at University of Vermont taught by Farryl Bertmann in Fall 2016. Since its upload, it has received 4 views. For similar materials see Nutrition in the life cycle in Nutrition and Food Sciences at University of Vermont.
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Date Created: 10/03/16
Normal Adolescent Nutrition Physical growth The adolescent growth spurt takes 2-4 years to complete Longer in boys than girls Typically starts earlier in girls Average height velocity is 5-6 cm/year Peak height velocity is 8-10 cm/year Girls typically begin puberty at age 9 and peak at 11.5 years Fat mass o Girls gain at average rate of 1.14 kg per year o Boys do not experience significant increase in absolute fat o Boys do show a greater increase in overall mass o At ages 8-10 boys typically have 15% body fat and 24 kg of fat free mass At 18-20 males have 13% body fat Bone Growth and Mineralization o Bone mass doubles between puberty and young adulthood o Growth is greatest approximately 6 months after puberty begins o Approximately 25% of peak adult bone mass is acquired the two years of peak growth o When growth plates fuse post puberty, bone mass development is 90- 95% of peak BMD o Boys on average are 10% taller and have 25% greater peak bone mass because of later puberty and longer growth spurt Hormonal Mediators of The Adolescent growth Spurt During childhood, the activity of many hormones is suppressed by the central nervous system. Height growth potential is calculated from parental height Skeletal age is assessed using radiography of the left hand and wrist Adolescent Growth Disorders Short stature o Chronic illness, poor diet, psychosocial etiology can cause short stature o Other pathological causes Endocrine disorders like hypothyroidism and GH deficiency Intrauterine growth retardation Chromosomal defects, turner, down, and Prader-Willi syndromes Skeletal dysplasia o Children that are vegetarian before puberty are more likely not to reach their height potential Tall stature o Endocrine causes of tall stature include hyperthyroidism, precocious puberty, GH secreting tumors o Klinefelter, Marfan, Sotos and Beckwith-Widermann syndromes are rare genetic disorders that cause extreme height