Cited by 169Cardiovascular and exercise physiologyMuscle metabolism and nutritionDiabetes, Cardiovascular Risks, and Lipoproteins

Effects of Obesity on Substrate Utilization during Exercise

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Goodpaster, Bret H., Wolfe, Robert R., Kelley, David E.·2002·Obesity Research

Abstract

Objective: The capacity for lipid and carbohydrate (CHO) oxidation during exercise is important for energy partitioning and storage. This study examined the effects of obesity on lipid and CHO oxidation during exercise. Research Methods and Procedures: Seven obese and seven lean [body mass index (BMI), 33 ± 0.8 and 23.7 ± 1.2 kg/m 2 , respectively] sedentary, middle‐aged men matched for aerobic capacity performed 60 minutes of cycle exercise at similar relative (50% V o 2max ) and absolute exercise intensities. Results: Obese men derived a greater proportion of their energy from fatty‐acid oxidation than lean men (43 ± 5% 31 ± 2%; p = 0.02). Plasma fatty‐acid oxidation determined from recovery of infused [0.15 μmol/kg fat‐free mass (FFM) per minute] [1‐ 13 C]‐palmitate in breath CO 2 was similar for obese and lean men (8.4 ± 1.1 and 29 ± 15 μmol/kg FFM per minute). Nonplasma fatty‐acid oxidation, presumably, from intramuscular sources, was 50% higher in obese men than in lean men (10.0 ± 0.6 versus 6.6 ± 0.8 μmol/kg FFM per minute; p < 0.05). Systemic glucose disposal was similar in lean and obese groups (33 ± 8 and 29 ± 15 μmol/kg FFM per minute). However, the estimated rate of glycogen‐oxidation was 50% lower in obese than in lean men (61 ± 12 versus 90 ± 6 μmol/kg FFM per minute; p < 0.05). Discussion: During moderate exercise, obese sedentary men have increased rates of fatty‐acid oxidation from nonplasma sources and reduced rates of CHO oxidation, particularly muscle glycogen, compared with lean sedentary men.

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Crossref · 10.1038/oby.2002.78

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Authors
Goodpaster, B. H., Wolfe, R. R., & Kelley, D. E.
Affiliations
  • University of Pittsburgh (US)
  • The University of Texas Medical Branch at Galveston (US)
Corresponding author
Goodpaster, Bret H.
Venue
Obesity Research
Publisher
Wiley
Published
2002-07
Volume
10
Issue
7
Pages
575-584
ISSN
  • 1071-7323 (ISSN-L)
  • 1550-8528
OpenAlex
W2067153601
Cited by
169
References
42
Citations by year
2026: 3 · 2025: 5 · 2024: 4 · 2023: 5 · 2022: 18 · 2021: 9 · 2020: 13 · 2019: 6 · 2018: 6 · 2017: 6 · 2016: 8 · 2015: 9 · 2014: 5 · 2013: 8 · 2012: 6
FWCI
12.16
Type
journal article
Language
en
Open access
Locations
  • Obesity Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5k01ag000851-04, 5p30dk046204-15)
  • National Institute on Aging (K01-AG-00851)
  • National Institute of Diabetes and Digestive and Kidney Diseases (1P30DK-46204)
  • National Center for Research Resources (M01RR000056, 5 M01 RR 0056)
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 › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
Keywords
obesity, substrate utilization, fatty acid oxidation, carbohydrate oxidation, energy allocation, muscle glycogen, glucose disposal, moderate-intensity exercise
MeSH terms
Adult, Blood Glucose, Breath Tests, Carbon Isotopes, Energy Metabolism, Fatty Acids, Fatty Acids, Nonesterified, Glycogen, Humans, Insulin, Kinetics, Male, Norepinephrine, Obesity, Oxidation-Reduction, Oxygen Consumption, Exercise, Body Mass Index, Muscle, Skeletal, Palmitic Acid

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