title: Body composition of elite, eumenorrheic and amenorrheic, adolescent cross-country runners.
abstract: The purpose of the study was to investigate the seasonal relationship of athletic amenorrhea and body composition in elite, adolescent, cross-country runners. The participants consisted of 28 female adolescent cross-country runners (mean age +/- SD = 15.4 +/- 1.5 years); 17 eumenorrheics and 11 amenorrheics. The participants' body composition was measured pre- and postseason using dual-energy X-ray Absorptiometer (DXA). The eumenorrheics' postseason BMD was significantly greater than the amenorrheics' postseason BMD (F(1,54) = 16.22, p < .05, partial eta2 = .231). The eumenorrheics' postseason bodyweight (F(1,54) = 7.65, p < .05, partial eta2 = .124), BF (F(1,54) = 8.56, p < .05, partial eta2 = .137), and BMC (F(1,54) = 8.52, p < .05, partial eta2 = .136) were significantly greater than the amenorrheic subgroup. There was also a significant seasonal increase in BMD (t(27) = -4.01, p < .05) for the overall group and the eumenorrheic subgroup (t(16) = -3.90, p < .05). Bodyweight best predicted BMD (F(1,26) = 46.434, p < .05, R2 = .641). In the study, athletic amenorrhea was highly associated with lower levels of BMD in the participants, and cross-country running was highly associated with increased BMD.
authors.affiliation: College of Education and Human Development, University of New Orleans, New Orleans, LA 70148, USA.
authors.forename: Marc
authors.initials: M
authors.lastname: Bonis
authors.forename: Mark
authors.initials: M
authors.lastname: Loftin
authors.forename: Richard
authors.initials: R
authors.lastname: Speaker
authors.forename: Anthony
authors.initials: A
authors.lastname: Kontos
mesh_terms: D050154:Adiposity; D000293:Adolescent; D000568:Amenorrhea / Q000503:physiopathology*; D001835:Body Weight; D015519:Bone Density; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D012420:Running / Q000502:physiology*