Body composition changes during Tanner stage 5.
Clinicians use the combination of Tanner stage 5 (T5) of puberty, final height, and epiphyseal fusion to define maturity. We tested the hypothesis that changes in body composition related to age are identifiable during T5. Asian, Black, Hispanic, and White T5 adolescents (n = 148, 72 females) had measurements taken of their height, weight, total body potassium by 40K counting, total body water by D2O dilution; and total body bone mineral, fat-free mass, and fat mass by dual-energy X-ray absorptiometry. The relative increases with age in lean body components were greater than those in height and weight, and were greater in males. Age was a significant determinant of all body components in males, but of only bone mineral in females. The effect of age was independent of ethnicity. These findings suggest an independent effect of age on body composition during T5, especially in males. We propose that peak levels of lean body components should be included in the definition of maturity in certain clinical and metabolic situations.
Horlick
M
M
Body Composition Unit, St. Luke's-Roosevelt Hospital Center, New York, New York 10025, USA. mnh1@columbia.edu
Thornton
J
J
Wang
J
J
Levine
L S
LS
Fedun
B
B
Pierson
R N
RN
D015502:Absorptiometry, Photon / Q000379:methods; D000293:Adolescent; D001741:Black or African American; D000367:Age Factors; D001208:Asia / Q000208:ethnology; D044466:Asian People; D044383:Black People; D001823:Body Composition / Q000502:physiology*; D001834:Body Water; D002648:Child; D003430:Cross-Sectional Studies; D017666:Deuterium Oxide; D005260:Female; D006630:Hispanic or Latino; D006801:Humans; D008297:Male; D009519:New York City; D011188:Potassium / Q000032:analysis; D011627:Puberty / Q000502:physiology*; D012727:Sex Characteristics; D044465:White People
D017666:Deuterium Oxide; D011188:Potassium