title: Inter-methods agreement for the assessment of percentage of body fat between two laboratory methods in male adolescent cyclists.
abstract: OBJECTIVE
  To examine inter-methods agreement between dual energy X-ray absorptiometry (DXA) and air displacement plethysmography (ADP) in male adolescent cyclists for assessing percentage of body fat (PBF).
  
  
  METHODS
  PBF of 24 male adolescent cyclists was assessed by DXA and ADP. Agreement between ADP and DXA was determined according to a Bland-Altman plot; validity and lack of agreement was assessed by calculating inter-methods difference. The limits of agreement and differences between methods were also calculated by paired t-tests. Heteroscedasticity was also examined.
  
  
  RESULTS
  The values obtained by DXA were higher than those obtained by ADP, and the graph presented heteroscedasticity (both p < 0.05; r = 0.74).
  
  
  CONCLUSIONS
  DXA and ADP methods were not comparable in terms of PBF assessment in our sample of male adolescent cyclists; it needs to be taken into account when evaluating longitudinal changes in this determined population.
authors.affiliation: GENUD (Growth, Exercise, Nutrition and Development) Research Group, Aberystwysth University, Ceredigion, United Kingdom. alg28@aber.ac.uk
authors.forename: Alejandro
authors.initials: A
authors.lastname: González-Agüero
authors.forename: Hugo
authors.initials: H
authors.lastname: Olmedillas
authors.forename: Alba
authors.initials: A
authors.lastname: Gómez-Cabello
authors.forename: Alexander
authors.initials: A
authors.lastname: Guillén-Ballester
authors.forename: José A
authors.initials: JA
authors.lastname: Casajús
authors.forename: Germán
authors.initials: G
authors.lastname: Vicente-Rodríguez
mesh_terms: D015502:Absorptiometry, Photon / Q000379:methods*; D050154:Adiposity / Q000502:physiology*; D000293:Adolescent; D000886:Anthropometry; D001642:Bicycling / Q000502:physiology*; D001823:Body Composition / Q000502:physiology*; D006801:Humans; D008297:Male; D010993:Plethysmography, Whole Body / Q000379:methods*; D015203:Reproducibility of Results