Reproducibility of Fatmax and fat oxidation rates during exercise in recreationally trained males

Croci, Ilaria, Borrani, Fabio, Byrne, Nuala, Wood, Rache, Hickman, Ingrid, Cheneviere, Xavier and Malatesta, Davide (2014) Reproducibility of Fatmax and fat oxidation rates during exercise in recreationally trained males. PLoS One, 9 6: e97930.1-e97930.10. doi:10.1371/journal.pone.0097930

Author Croci, Ilaria
Borrani, Fabio
Byrne, Nuala
Wood, Rache
Hickman, Ingrid
Cheneviere, Xavier
Malatesta, Davide
Title Reproducibility of Fatmax and fat oxidation rates during exercise in recreationally trained males
Journal name PLoS One   Check publisher's open access policy
ISSN 1932-6203
Publication date 2014-06-02
Year available 2014
Sub-type Article (original research)
DOI 10.1371/journal.pone.0097930
Open Access Status DOI
Volume 9
Issue 6
Start page e97930.1
End page e97930.10
Total pages 10
Place of publication San Francisco, CA United States
Publisher Public Library of Science
Language eng
Subject 1100 Agricultural and Biological Sciences
1300 Biochemistry, Genetics and Molecular Biology
2700 Medicine
Abstract Aerobic exercise training performed at the intensity eliciting maximal fat oxidation (Fatmax) has been shown to improve the metabolic profile of obese patients. However, limited information is available on the reproducibility of Fatmax and related physiological measures. The aim of this study was to assess the intra-individual variability of: a) Fat max measurements determined using three different data analysis approaches and b) fat and carbohydrate oxidation rates at rest and at each stage of an individualized graded test. Fifteen healthy males [body mass index 23.1±0.6 kg/m2, maximal oxygen consumption (V̇ O 2max) 52.0±2.0 ml/kg/min] completed a maximal test and two identical submaximal incremental tests on ergocycle (30-min rest followed by 5-min stages with increments of 7.5% of the maximal power output). Fat and carbohydrate oxidation rates were determined using indirect calorimetry. Fatmax was determined with three approaches: the sine model (SIN), measured values (MV) and 3rd polynomial curve (P3). Intra-individual coefficients of variation (CVs) and limits of agreement were calculated. CV for Fatmax determined with SIN was 16.4% and tended to be lower than with P3 and MV (18.6% and 20.8%, respectively). Limits of agreement for Fat max were -2±27% of V̇ O2max with SIN, -4±32 with P3 and -4±28 with MV. CVs of oxygen uptake, carbon dioxide production and respiratory exchange rate were <10% at rest and <5% during exercise. Conversely, CVs of fat oxidation rates (20% at rest and 24-49% during exercise) and carbohydrate oxidation rates (33.5% at rest, 8.5-12.9% during exercise) were higher. The intra-individual variability of Fat max and fat oxidation rates was high (CV>15%), regardless of the data analysis approach employed. Further research on the determinants of the variability of Fatmax and fat oxidation rates is required.
Keyword Multidisciplinary Sciences
Science & Technology - Other Topics
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Human Movement and Nutrition Sciences Publications
UQ Diamantina Institute Publications
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