title: Precision Error in Dual-Energy X-Ray Absorptiometry Body Composition Measurements in Elite Male Rugby League Players.
abstract: Body composition analysis using dual-energy X-ray absorptiometry (DXA) is becoming increasingly popular in both clinical and sports science settings. Obesity, characterized by high fat mass (FM), is associated with larger precision errors; however, precision error for athletic groups with high levels of lean mass (LM) are unclear. Total (TB) and regional (limbs and trunk) body composition were determined from 2 consecutive total body scans (GE Lunar iDXA) with re-positioning in 45 elite male rugby league players (age: 21.8 ± 5.4 yr; body mass index: 27.8 ± 2.5 kg m(-1)). The root mean squared standard deviation (percentage co-efficient of variation) were TB bone mineral content: 24g (1.7%), TB LM: 321 g (1.6%), and TB FM: 280 g (2.3%). Regional precision values were superior for measurements of bone mineral content: 4.7-16.3 g (1.7-2.1%) and LM: 137-402 g (2.0-2.4%), than for FM: 63-299 g (3.1-4.1%). Precision error of DXA body composition measurements in elite male rugby players is higher than those reported elsewhere for normal adult populations and similar to those reported in those who are obese. It is advised that caution is applied when interpreting longitudinal DXA-derived body composition measurements in male rugby players and population-specific least significant change should be adopted.
authors.affiliation: Leeds Beckett University, Institute for Sport, Physical Activity and Leisure, Carnegie Faculty, Leeds, West Yorkshire, United Kingdom. Electronic address: matthew.barlow@leedsbeckett.ac.uk.
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Barlow
authors.affiliation: Leeds Beckett University, Institute for Sport, Physical Activity and Leisure, Carnegie Faculty, Leeds, West Yorkshire, United Kingdom.
authors.forename: Brian
authors.initials: B
authors.lastname: Oldroyd
authors.affiliation: Leeds Beckett University, Institute for Sport, Physical Activity and Leisure, Carnegie Faculty, Leeds, West Yorkshire, United Kingdom.
authors.forename: Debbie
authors.initials: D
authors.lastname: Smith
authors.affiliation: Leeds Beckett University, Institute for Sport, Physical Activity and Leisure, Carnegie Faculty, Leeds, West Yorkshire, United Kingdom.
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Lees
authors.affiliation: Leeds Beckett University, Institute for Sport, Physical Activity and Leisure, Carnegie Faculty, Leeds, West Yorkshire, United Kingdom.
authors.forename: Amy
authors.initials: A
authors.lastname: Brightmore
authors.affiliation: Leeds Beckett University, Institute for Sport, Physical Activity and Leisure, Carnegie Faculty, Leeds, West Yorkshire, United Kingdom.
authors.forename: Kevin
authors.initials: K
authors.lastname: Till
authors.affiliation: Leeds Beckett University, Institute for Sport, Physical Activity and Leisure, Carnegie Faculty, Leeds, West Yorkshire, United Kingdom.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Jones
authors.affiliation: Leeds Beckett University, Institute for Sport, Physical Activity and Leisure, Carnegie Faculty, Leeds, West Yorkshire, United Kingdom.
authors.forename: Karen
authors.initials: K
authors.lastname: Hind
mesh_terms: D015502:Absorptiometry, Photon; D000293:Adolescent; D001823:Body Composition; D015519:Bone Density; D005538:Football; D006801:Humans; D008297:Male; D015203:Reproducibility of Results; D055815:Young Adult
keywords: Bone mass; DXA; fat mass; lean mass; reproducibility