Comparison of indirect calorimetry and a new breath 13C/12C ratio method during strenuous exercise
Abstract
A new stable isotope method for the determination of substrate oxidation rates in vivo is described and compared with indirect calorimetry at rest and during high-intensity exercise (30 min at 80-85% maximal O2 uptake capacity) in six well-trained cyclists. This method uses the absolute ratios of 13C/12C in expired air, endogenous glucose, fat, and protein in addition to O2 consumption and is independent of CO2 production (VCO2). Carbohydrate and fat oxidation rates at rest, calculated by both methods, were not significantly different. During exercise the breath 13C/12C ratio increased and reached a steady state after 15-20 min. Carbohydrate oxidation rates during exercise were 39.4 +/- 5.2 and 41.7 +/- 5.7 mg.kg-1.min-1 [not significant (NS)], and fat oxidation rates were 7.3 +/- 1.3 and 6.9 +/- 1.2 mg.kg-1.min-1 (NS), using indirect calorimetry, and the breath ratio method, respectively. We conclude that the breath 13C/12C ratio method can be used to calculate substrate oxidation under different conditions, such as the basal state and exercise. In addition, the results obtained by this new method support the validity of the underlying assumption that indirect calorimetry regards VCO2 as a reflection of tissue CO2 production, during exercise in trained subjects, even up to 80-85% maximal O2 uptake.
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The procedure for calculating energy expenditure and substrate oxidation from respiratory exchange ratio and oxygen consumption has been validated against an in vivo stable isotope procedure.
“This procedure for calculation of energy expenditure-substrate oxidation has been validated against an in vivo stable isotope procedure [11].”
From The Effect of Sex Steroid Hormones on Substrate Oxidation during Prolonged Submaximal Exercise in Women. (2000) · cites this paper as [11]
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- Authors
- Romijn, J. A., Coyle, E. F., Hibbert, J., & Wolfe, R. R.
- Affiliations
- Shriners Hospitals for Children - Galveston (US)
- Venue
- American Journal of Physiology-Endocrinology and Metabolism
- Publisher
- American Physiological Society
- Published
- 1992-07-01
- Volume
- 263
- Issue
- 1
- Pages
- E64-E71
- ISSN
- 0193-1849 (ISSN-L)
- 1522-1555
- OpenAlex
- W1769042289
- Cited by
- 110
- References
- 0
- Citations by year
- 2026: 3 · 2025: 2 · 2023: 8 · 2022: 5 · 2021: 4 · 2020: 4 · 2019: 7 · 2018: 4 · 2017: 3 · 2016: 5 · 2015: 7 · 2014: 4 · 2013: 3 · 2012: 3
- FWCI
- 0.59
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- American Journal of Physiology-Endocrinology and Metabolism (publishedVersion)
- PubMed (publishedVersion)
- Data Archiving and Networked Services (DANS) (submittedVersion)
- Pure Amsterdam UMC (submittedVersion)
- Funders
- U.S. Public Health Service (CRC-00073)
- National Institute of Diabetes and Digestive and Kidney Diseases (DK34817, R01DK034817)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
- Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
- Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
- Keywords
- indirect calorimetry, stable isotope tracers, substrate oxidation, carbohydrate oxidation, fat oxidation, high-intensity exercise, expired air, CO2 production, trained cyclists, energy metabolism
- MeSH terms
- Adult, Calorimetry, Indirect, Carbon, Carbon Isotopes, Dietary Carbohydrates, Dietary Fats, Evaluation Studies as Topic, Physical Exertion, Glucose, Humans, Oxidation-Reduction, Oxygen Consumption, Respiration, Substrate Specificity
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