The day-to-day reliability of peak fat oxidation and FATMAX: Reliability of peak fat oxidation and FATMAX

Oliver Chrzanowski-Smith; Rob Edinburgh; Mark Thomas; Nicos Haralabidis; Sean Williams; James Betts; Javier Gonzalez

doi:10.1007/s00421-020-04397-3

The day-to-day reliability of peak fat oxidation and FATMAX: Reliability of peak fat oxidation and FATMAX

Oliver Chrzanowski-Smith, Rob Edinburgh, Mark Thomas, Nicos Haralabidis, Sean Williams, James Betts, Javier Gonzalez

Research output: Contribution to journal › Article › peer-review

19 Citations (SciVal)

Abstract

Purpose: Prior studies exploring the reliability of peak fat oxidation (PFO) and the intensity that elicits PFO (FAT _MAX) are often limited by small samples. This study characterised the reliability of PFO and FAT _MAX in a large cohort of healthy men and women. Methods: Ninety-nine adults [49 women; age: 35 (11) years; V˙ O ₂peak: 42.2 (10.3) mL·kg BM ⁻¹·min ⁻¹; mean (SD)] completed two identical exercise tests (7–28 days apart) to determine PFO (g·min ⁻¹) and FAT _MAX (%V˙ O ₂peak) by indirect calorimetry. Systematic bias and the absolute and relative reliability of PFO and FAT _MAX were explored in the whole sample and sub-categories of: cardiorespiratory fitness, biological sex, objectively measured physical activity levels, fat mass index (derived by dual-energy X-ray absorptiometry) and menstrual cycle status. Results: No systematic bias in PFO or FAT _MAX was found between exercise tests in the entire sample (− 0.01 g·min ⁻¹ and 0%V˙ O ₂peak, respectively; p > 0.05). Absolute reliability was poor [within-subject coefficient of variation: 21% and 26%; typical errors: ± 0.06 g·min ⁻¹ and × / ÷ 1.26%V˙ O ₂peak; 95% limits of agreement: ± 0.17 g·min ⁻¹ and × / ÷ 1.90%V˙ O ₂peak, respectively), despite high (r = 0.75) and moderate (r = 0.45) relative reliability for PFO and FAT _MAX, respectively. These findings were consistent across all sub-groups. Conclusion: Repeated assessments are required to more accurately determine PFO and FAT _MAX.

Original language	English
Pages (from-to)	1745-1759
Number of pages	15
Journal	European Journal of Applied Physiology
Volume	120
Issue number	8
DOIs	https://doi.org/10.1007/s00421-020-04397-3
Publication status	Published - 15 Jun 2020

Keywords

Exercise metabolism
FAT
Indirect calorimetry
Peak fat oxidation
Reliability
Variation

ASJC Scopus subject areas

Orthopedics and Sports Medicine
Public Health, Environmental and Occupational Health
Physiology (medical)

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1007/s00421-020-04397-3Licence: CC BY

Cite this

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title = "The day-to-day reliability of peak fat oxidation and FATMAX: Reliability of peak fat oxidation and FATMAX",

abstract = "Purpose: Prior studies exploring the reliability of peak fat oxidation (PFO) and the intensity that elicits PFO (FAT MAX) are often limited by small samples. This study characterised the reliability of PFO and FAT MAX in a large cohort of healthy men and women. Methods: Ninety-nine adults [49 women; age: 35 (11) years; V˙ O 2peak: 42.2 (10.3) mL·kg BM −1·min −1; mean (SD)] completed two identical exercise tests (7–28 days apart) to determine PFO (g·min −1) and FAT MAX (%V˙ O 2peak) by indirect calorimetry. Systematic bias and the absolute and relative reliability of PFO and FAT MAX were explored in the whole sample and sub-categories of: cardiorespiratory fitness, biological sex, objectively measured physical activity levels, fat mass index (derived by dual-energy X-ray absorptiometry) and menstrual cycle status. Results: No systematic bias in PFO or FAT MAX was found between exercise tests in the entire sample (− 0.01 g·min −1 and 0%V˙ O 2peak, respectively; p > 0.05). Absolute reliability was poor [within-subject coefficient of variation: 21% and 26%; typical errors: ± 0.06 g·min −1 and × / ÷ 1.26%V˙ O 2peak; 95% limits of agreement: ± 0.17 g·min −1 and × / ÷ 1.90%V˙ O 2peak, respectively), despite high (r = 0.75) and moderate (r = 0.45) relative reliability for PFO and FAT MAX, respectively. These findings were consistent across all sub-groups. Conclusion: Repeated assessments are required to more accurately determine PFO and FAT MAX. ",

keywords = "Exercise metabolism, FAT, Indirect calorimetry, Peak fat oxidation, Reliability, Variation",

author = "Oliver Chrzanowski-Smith and Rob Edinburgh and Mark Thomas and Nicos Haralabidis and Sean Williams and James Betts and Javier Gonzalez",

note = "Funding Information: We would like to thank all participants for graciously volunteering their time and effort to partake in the study. Additionally, Andrea Rawle from the Royal United Hospitals Bath NHS Foundation Trust is thanked for help on the biochemical analysis of oestrogen and progesterone concentrations. Thanks is also sent to Joel Thomas for his help in the study. We would also like to acknowledge funding provided by the University Research Studentship from the Graduate School, Faculty of Humanities and Social Sciences at the University of Bath and the University of Bath Alumni fund. These funds were not involved in any part of the study except for financial and equipment support. Publisher Copyright: {\textcopyright} 2020, The Author(s).",

year = "2020",

month = jun,

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doi = "10.1007/s00421-020-04397-3",

language = "English",

volume = "120",

pages = "1745--1759",

journal = "European Journal of Applied Physiology",

issn = "1439-6319",

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T1 - The day-to-day reliability of peak fat oxidation and FATMAX

T2 - Reliability of peak fat oxidation and FATMAX

AU - Chrzanowski-Smith, Oliver

AU - Edinburgh, Rob

AU - Thomas, Mark

AU - Haralabidis, Nicos

AU - Williams, Sean

AU - Betts, James

AU - Gonzalez, Javier

N1 - Funding Information: We would like to thank all participants for graciously volunteering their time and effort to partake in the study. Additionally, Andrea Rawle from the Royal United Hospitals Bath NHS Foundation Trust is thanked for help on the biochemical analysis of oestrogen and progesterone concentrations. Thanks is also sent to Joel Thomas for his help in the study. We would also like to acknowledge funding provided by the University Research Studentship from the Graduate School, Faculty of Humanities and Social Sciences at the University of Bath and the University of Bath Alumni fund. These funds were not involved in any part of the study except for financial and equipment support. Publisher Copyright: © 2020, The Author(s).

PY - 2020/6/15

Y1 - 2020/6/15

N2 - Purpose: Prior studies exploring the reliability of peak fat oxidation (PFO) and the intensity that elicits PFO (FAT MAX) are often limited by small samples. This study characterised the reliability of PFO and FAT MAX in a large cohort of healthy men and women. Methods: Ninety-nine adults [49 women; age: 35 (11) years; V˙ O 2peak: 42.2 (10.3) mL·kg BM −1·min −1; mean (SD)] completed two identical exercise tests (7–28 days apart) to determine PFO (g·min −1) and FAT MAX (%V˙ O 2peak) by indirect calorimetry. Systematic bias and the absolute and relative reliability of PFO and FAT MAX were explored in the whole sample and sub-categories of: cardiorespiratory fitness, biological sex, objectively measured physical activity levels, fat mass index (derived by dual-energy X-ray absorptiometry) and menstrual cycle status. Results: No systematic bias in PFO or FAT MAX was found between exercise tests in the entire sample (− 0.01 g·min −1 and 0%V˙ O 2peak, respectively; p > 0.05). Absolute reliability was poor [within-subject coefficient of variation: 21% and 26%; typical errors: ± 0.06 g·min −1 and × / ÷ 1.26%V˙ O 2peak; 95% limits of agreement: ± 0.17 g·min −1 and × / ÷ 1.90%V˙ O 2peak, respectively), despite high (r = 0.75) and moderate (r = 0.45) relative reliability for PFO and FAT MAX, respectively. These findings were consistent across all sub-groups. Conclusion: Repeated assessments are required to more accurately determine PFO and FAT MAX.

AB - Purpose: Prior studies exploring the reliability of peak fat oxidation (PFO) and the intensity that elicits PFO (FAT MAX) are often limited by small samples. This study characterised the reliability of PFO and FAT MAX in a large cohort of healthy men and women. Methods: Ninety-nine adults [49 women; age: 35 (11) years; V˙ O 2peak: 42.2 (10.3) mL·kg BM −1·min −1; mean (SD)] completed two identical exercise tests (7–28 days apart) to determine PFO (g·min −1) and FAT MAX (%V˙ O 2peak) by indirect calorimetry. Systematic bias and the absolute and relative reliability of PFO and FAT MAX were explored in the whole sample and sub-categories of: cardiorespiratory fitness, biological sex, objectively measured physical activity levels, fat mass index (derived by dual-energy X-ray absorptiometry) and menstrual cycle status. Results: No systematic bias in PFO or FAT MAX was found between exercise tests in the entire sample (− 0.01 g·min −1 and 0%V˙ O 2peak, respectively; p > 0.05). Absolute reliability was poor [within-subject coefficient of variation: 21% and 26%; typical errors: ± 0.06 g·min −1 and × / ÷ 1.26%V˙ O 2peak; 95% limits of agreement: ± 0.17 g·min −1 and × / ÷ 1.90%V˙ O 2peak, respectively), despite high (r = 0.75) and moderate (r = 0.45) relative reliability for PFO and FAT MAX, respectively. These findings were consistent across all sub-groups. Conclusion: Repeated assessments are required to more accurately determine PFO and FAT MAX.

KW - Exercise metabolism

KW - FAT

KW - Indirect calorimetry

KW - Peak fat oxidation

KW - Reliability

KW - Variation

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JO - European Journal of Applied Physiology

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The day-to-day reliability of peak fat oxidation and FATMAX: Reliability of peak fat oxidation and FATMAX

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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Centre for the Analysis of Motion, Entertainment Research and Applications (CAMERA)

Dataset for the day-to-day reliability of peak fat oxidation and FATMAX

Cite this

The day-to-day reliability of peak fat oxidation and FATMAX: Reliability of peak fat oxidation and FATMAX

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

Access to Document

Other files and links

Embargoed Document

Fingerprint

Projects

Centre for the Analysis of Motion, Entertainment Research and Applications (CAMERA)

Datasets

Dataset for the day-to-day reliability of peak fat oxidation and FATMAX

Cite this