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Reproducibility of Fat(max) and Fat Oxidation Rates during Exercise in Recreationally Trained Males
Aerobic exercise training performed at the intensity eliciting maximal fat oxidation (Fat(max)) has been shown to improve the metabolic profile of obese patients. However, limited information is available on the reproducibility of Fat(max) and related physiological measures. The aim of this study wa...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4041727/ https://www.ncbi.nlm.nih.gov/pubmed/24886715 http://dx.doi.org/10.1371/journal.pone.0097930 |
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author | Croci, Ilaria Borrani, Fabio Byrne, Nuala Wood, Rachel Hickman, Ingrid Chenevière, Xavier Malatesta, Davide |
author_facet | Croci, Ilaria Borrani, Fabio Byrne, Nuala Wood, Rachel Hickman, Ingrid Chenevière, Xavier Malatesta, Davide |
author_sort | Croci, Ilaria |
collection | PubMed |
description | Aerobic exercise training performed at the intensity eliciting maximal fat oxidation (Fat(max)) has been shown to improve the metabolic profile of obese patients. However, limited information is available on the reproducibility of Fat(max) 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/m(2), maximal oxygen consumption ([Image: see text]) 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. Fat(max) was determined with three approaches: the sine model (SIN), measured values (MV) and 3(rd) polynomial curve (P3). Intra-individual coefficients of variation (CVs) and limits of agreement were calculated. CV for Fat(max) 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 [Image: see text] 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 Fat(max) and fat oxidation rates is required. |
format | Online Article Text |
id | pubmed-4041727 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-40417272014-06-09 Reproducibility of Fat(max) and Fat Oxidation Rates during Exercise in Recreationally Trained Males Croci, Ilaria Borrani, Fabio Byrne, Nuala Wood, Rachel Hickman, Ingrid Chenevière, Xavier Malatesta, Davide PLoS One Research Article Aerobic exercise training performed at the intensity eliciting maximal fat oxidation (Fat(max)) has been shown to improve the metabolic profile of obese patients. However, limited information is available on the reproducibility of Fat(max) 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/m(2), maximal oxygen consumption ([Image: see text]) 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. Fat(max) was determined with three approaches: the sine model (SIN), measured values (MV) and 3(rd) polynomial curve (P3). Intra-individual coefficients of variation (CVs) and limits of agreement were calculated. CV for Fat(max) 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 [Image: see text] 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 Fat(max) and fat oxidation rates is required. Public Library of Science 2014-06-02 /pmc/articles/PMC4041727/ /pubmed/24886715 http://dx.doi.org/10.1371/journal.pone.0097930 Text en © 2014 Croci et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited. |
spellingShingle | Research Article Croci, Ilaria Borrani, Fabio Byrne, Nuala Wood, Rachel Hickman, Ingrid Chenevière, Xavier Malatesta, Davide Reproducibility of Fat(max) and Fat Oxidation Rates during Exercise in Recreationally Trained Males |
title | Reproducibility of Fat(max) and Fat Oxidation Rates during Exercise in Recreationally Trained Males |
title_full | Reproducibility of Fat(max) and Fat Oxidation Rates during Exercise in Recreationally Trained Males |
title_fullStr | Reproducibility of Fat(max) and Fat Oxidation Rates during Exercise in Recreationally Trained Males |
title_full_unstemmed | Reproducibility of Fat(max) and Fat Oxidation Rates during Exercise in Recreationally Trained Males |
title_short | Reproducibility of Fat(max) and Fat Oxidation Rates during Exercise in Recreationally Trained Males |
title_sort | reproducibility of fat(max) and fat oxidation rates during exercise in recreationally trained males |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4041727/ https://www.ncbi.nlm.nih.gov/pubmed/24886715 http://dx.doi.org/10.1371/journal.pone.0097930 |
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