Cited by 108Cardiovascular and exercise physiologyMuscle metabolism and nutritionAdipose Tissue and Metabolism

Triglyceride/fatty acid cycling is increased after exercise

Bahr, Roald, Hansson, Per, Sejersted, Ole M.·1990·Metabolism

Abstract

After exercise, there is a prolonged increase in O2 consumption termed the excess postexercise O2 consumption (EPOC). In this study, we have assessed the relative contribution of the triglyceride/fatty acid (TG/FA) substrate cycle to EPOC. Six healthy, young men exercised for 2 hours at 51% of maximal O2 uptake. The total energy expenditure and the rate of FA oxidation were estimated from measurements of O2 uptake, respiratory exchange ratio, and urinary nitrogen excretion while the subjects rested in bed for 3.5 hours postexercise. During the last part of the recovery period, the rate of FA mobilization was determined by infusion of glycerol. The rate of TG/FA cycling was calculated from the difference between the rate of FA mobilization and oxidation. An identical control study without exercise was also performed. The total EPOC during the recovery period was 7.82 +/- 1.51 L O2 (a 15% +/- 3% increase above the control O2 consumption). The rate of FA oxidation increased from 252 +/- 36 mumol/min (control) to 360 +/- 27 mumol/min (3 hours postexercise). The rate of FA mobilization increased from 666 +/- 108 mumol/min (control) to 1833 +/- 456 mumol/min (3 hours postexercise). TG/FA cycling was found to increase from 414 +/- 90 mumol FA/min (control) to 1473 +/- 435 mumol FA/min (3 hours postexercise). The energy cost of these rates of TG/FA cycling was found to be 0.09 +/- 0.02 kJ/min (control) and 0.31 +/- 0.09 kJ/min (3 hours postexercise). It is concluded that the energy cost of the increased TG/FA cycling rate may account for as much as half of the delayed component of EPOC.

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Crossref · 10.1016/0026-0495(90)90313-2

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Authors
Bahr, R., Hansson, P., & Sejersted, O. M.
Affiliations
National Institute of Occupational Health (NO)
Corresponding author
Bahr, Roald
Venue
Metabolism
Publisher
Elsevier BV
Published
1990-09
Volume
39
Issue
9
Pages
993-999
ISSN
0026-0495 (ISSN-L)
OpenAlex
W1966901815
Cited by
108
References
29
Citations by year
2026: 1 · 2025: 2 · 2024: 1 · 2023: 1 · 2022: 1 · 2021: 1 · 2020: 1 · 2019: 2 · 2018: 2 · 2017: 3 · 2016: 3 · 2015: 2 · 2014: 4 · 2013: 2 · 2012: 6
FWCI
16.22
Type
journal article
Language
en
Open access
closed
Locations
  • Metabolism (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
Keywords
excess post-exercise oxygen consumption, fatty acid oxidation, fatty acid mobilization, substrate cycling, energy expenditure, post-exercise recovery, glycerol infusion, respiratory exchange ratio, urinary nitrogen excretion
MeSH terms
Adult, Energy Metabolism, Physical Exertion, Fatty Acids, Nonesterified, Glycerol, Humans, Infusions, Intravenous, Lipid Mobilization, Male, Oxygen Consumption, Reference Values, Time Factors, Triglycerides

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