Journal article
Effects of Daily Activities on Dual-Energy X-ray Absorptiometry Measurements of Body Composition in Active People
Medicine and Science in Sports and Exercise, Vol.44(1), pp.180-189
2012
PMID: 22179140
Abstract
Purpose: Dual-energy x-ray absorptiometry (DXA) is becoming a popular tool to measure body composition in athletes, owing to its ease of operation and comprehensive analysis of body composition. This study represents the first systematic investigation of the reliability of DXA measurements of body composition in trained individuals and includes measurements of daily variability as well as the specific effect of the intake of a meal. Methods: Physically active young adults (15 females, 16 males) underwent five whole-body DXA scans during a 2-d period: in the morning after an overnight fast, ∼5 min later after repositioning on the scanning bed, ∼8 h later after usual daily activities, and the next morning before and ∼30 min after consumption of a simple breakfast. Magnitudes of typical (standard) errors of measurement and changes in the mean of DXA measures were assessed by standardization. Results: Repositioning produced trivial typical errors for whole-body composition, whereas regional body composition showed substantial errors. Daily activities and consumption of breakfast generally produced a substantial increase in the typical error and mean of DXA estimates of total and regional lean mass and associated body mass. Conclusions: Having a standardized scanning protocol and fasted subjects is the most practical way to minimize measurement errors. Future studies involving DXA in measuring body composition should report their scanning and analysis protocol with their associated typical errors of measurement so that the level of reliability can be assessed.
Details
- Title
- Effects of Daily Activities on Dual-Energy X-ray Absorptiometry Measurements of Body Composition in Active People
- Authors
- A Nana (Author) - Australian Institute of SportGary J Slater (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringW G Hopkins (Author) - Auckland University of TechnologyL M Burke (Author) - Australian Institute of Sport
- Publication details
- Medicine and Science in Sports and Exercise, Vol.44(1), pp.180-189
- Publisher
- Lippincott Williams & Wilkins
- Date published
- 2012
- DOI
- 10.1249/MSS.0b013e318228b60e
- ISSN
- 0195-9131
- PMID
- 22179140
- Organisation Unit
- University of the Sunshine Coast, Queensland; School of Health - Nutrition & Dietetics; School of Health and Sport Sciences - Legacy; School of Health and Behavioural Sciences - Legacy
- Language
- English
- Record Identifier
- 99449362902621
- Output Type
- Journal article
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