title: [Adolescents do not lose bone mineral density postpartum: comparative study with adult women].
abstract: OBJECTIVE
  To analyze the pattern of bone mineral density (BMD), serum concentrations of estradiol and calcium levels, dietary calcium, body mass index (BMI), and lactation in adolescents and adult women at 15, 90, and 365 postpartum days (ppd).
  
  
  METHODS
  A prospective cohort study was conducted of 33 adolescents and 39 adult women. Anthropometric and dietetic evaluations were performed, as well as evaluations of bone mineral density in L2-L4 and femur neck. Estradiol concentrations and calcium serum levels were determined.
  
  
  RESULTS
  L2-L4 BMD increased by 16% in adolescents, and 3% in adult women from day 15 to 365 ppd. While age was associated with this change (β=13.779, EE=3.5, p=0.001), lactation was not (β=-0.705, EE=0.647, p=0.283). The adult women had a higher L2-L4 BMD at 15, 90, and 635 ppd (1.151 vs 0.978 g/cm², 1.195 vs 1.070 g/cm², 1.195 vs 1.123 g/cm², respectively) (p<0.003).
  
  
  CONCLUSIONS
  Adolescents' BMD increased three times more than that of adult women. For all women, BMD was dependent of age and independent of lactation.
authors.affiliation: Instituto Nacional de Perinatología, DF, México. ssmr0119@yahoo.com.mx
authors.forename: Reyna
authors.initials: R
authors.lastname: Sámano
authors.forename: Rosa María
authors.initials: RM
authors.lastname: Morales
authors.forename: Adriana
authors.initials: A
authors.lastname: Flores-García
authors.forename: Josefina
authors.initials: J
authors.lastname: Lira
authors.forename: Fernando
authors.initials: F
authors.lastname: Isoard
authors.forename: Soledad
authors.initials: S
authors.lastname: de Santiago
authors.forename: Esther
authors.initials: E
authors.lastname: Casanueva
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D015992:Body Mass Index; D018488:Bone Demineralization, Pathologic / Q000097:blood / Q000453:epidemiology / Q000503:physiopathology; D015519:Bone Density; D002118:Calcium / Q000097:blood; D002136:Calcium, Dietary / Q000493:pharmacokinetics; D002648:Child; D004958:Estradiol / Q000097:blood; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007774:Lactation / Q000097:blood / Q000502:physiology; D049590:Postpartum Period / Q000097:blood / Q000502:physiology*; D011247:Pregnancy; D011253:Pregnancy in Adolescence / Q000706:statistics & numerical data; D011446:Prospective Studies; D055815:Young Adult
chemical_list: D002136:Calcium, Dietary; D004958:Estradiol; D002118:Calcium