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European Journal of Applied Physiology

, Volume 118, Issue 6, pp 1273–1286 | Cite as

Influence of subject presentation on interpretation of body composition change after 6 months of self-selected training and diet in athletic males

  • Ava D. Kerr
  • Gary J. Slater
  • Nuala M. Byrne
Original Article

Abstract

Purpose

High precision body composition assessment methods accurately monitor physique traits in athletes. The acute impact of subject presentation (ad libitum food and fluid intake plus physical activity) on body composition estimation using field and laboratory methods has been quantified, but the impact on interpretation of longitudinal change is unknown. This study evaluated the impact of athlete presentation (standardised versus non-standardised) on interpretation of change in physique traits over time. Thirty athletic males (31.2 ± 7.5 years; 182.2 ± 6.5 cm; 91.7 ± 10.3 kg; 27.6 ± 2.6 kg/m2) underwent two testing sessions on 1 day including surface anthropometry, dual-energy X-ray absorptiometry (DXA), bioelectrical impedance spectroscopy (BIS) and air displacement plethysmography (via the BOD POD), with combinations of these used to establish three-compartment (3C) and four-compartment (4C) models.

Methods

Tests were conducted after an overnight fast (BASEam) and ~ 7 h later after ad libitum food/fluid and physical activity (BASEpm). This procedure was repeated 6 months later (POSTam and POSTpm). Magnitude of changes in the mean was assessed by standardisation.

Results

After 6 months of self-selected training and diet, standardised presentation testing (BASEam to POSTam) identified trivial changes from the smallest worthwhile effect (SWE) in fat-free mass (FFM) and fat mass (FM) for all methods except for BIS (FM) where there was a large change (7.2%) from the SWE. Non-standardised follow-up testing (BASEam to POSTpm) showed trivial changes from the SWE except for small changes in FFM (BOD POD) of 1.1%, and in FM (3C and 4C models) of 6.4 and 3.5%. Large changes from the SWE were found in FFM (BIS, 3C and 4C models) of 2.2, 1.8 and 1.8% and in FM (BIS) of 6.4%. Non-standardised presentation testing (BASEpm to POSTpm) identified trivial changes from the SWE in FFM except for BIS which was small (1.1%). A moderate change from the SWE was found for BOD POD (3.3%) and large for BIS (9.4%) in FM estimations.

Conclusions

Changes in body composition utilising non-standardised presentation were more substantial and often in the opposite direction to those identified using standardised presentation, causing misinterpretation of change in physique traits. Standardised presentation prior to body composition assessment for athletic populations should be advocated to enhance interpretation of true change.

Keywords

Body composition Air-displacement plethysmography Dual-energy X-ray absorptiometry Bioelectrical impedance spectroscopy Surface anthropometry 

Abbreviations

2C model

Two-compartment model

3C model

Three-compartment model

4C model

Four-compartment model

BASEam

Baseline morning testing session, standardised presentation

BASEpm

Baseline afternoon testing session, non-standardised presentation

BIS

Bioelectrical impedance spectroscopy

BM

Body mass

BMI

Body mass index

BMC

Bone mineral content

BOD POD

Air displacement plethysmography

CV

Coefficient of variation

D2O

Deuterium dilution

DXA

Dual-energy X-ray absorptiometry

FM

Fat mass

FFM

Fat-free mass

LM

Lean mass

NHANES

National Health and Nutrition Examination Survey

POSTam

Post 6 months morning testing session, standardised presentation

POSTpm

Post 6 months afternoon testing session, non-standardised presentation

SA

Surface anthropometry

SD

Standard deviation

SWE

Smallest worthwhile effect

TBW

Total body water

TEM

Technical error of measurement

%BF

Percentage of body fat

VTG

Volume of thoracic gas

Notes

Acknowledgements

The results of this study are presented clearly, honestly, and without fabrication, falsification, or inappropriate data manipulation.

Author contributions

The authors’ responsibilities were as follows—AK and GJS: study concept and design; AK: acquisition of data; AK and GJS: analysis and interpretation of data; AK: draft of manuscript; AK, GJS and NB: critical revision of the manuscript for important intellectual content; AK: statistical analysis; and GJS: study supervision. AK had full access to all of the data in the study and takes responsibility for the integrity and the accuracy of the data analysis.

Funding

There were no funding sources for the present study.

Compliance with ethical standards

Conflict of interest

The authors have no financial or personal conflicts of interest to declare.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Health and Sport SciencesUniversity of the Sunshine CoastSippy DownsAustralia
  2. 2.School of Health Sciences, Faculty of HealthUniversity of TasmaniaLauncestonAustralia
  3. 3.School of Health and Sport SciencesUniversity of the Sunshine CoastMaroochydore DCAustralia

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