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Cited by 45Cardiovascular and exercise physiologyMuscle metabolism and nutritionDietary Effects on Health

Exercising Fasting or Fed to Enhance Fat Loss? Influence of Food Intake on Respiratory Ratio and Excess Postexercise Oxygen Consumption After a Bout of Endurance Training

Paoli, Antonio, Marcolin, Giuseppe, Zonin, Fabio, Neri, Marco, Sivieri, Andrea, Pacelli, Quirico F.·2011·International Journal of Sport Nutrition and Exercise Metabolism
DOI 10.1123/ijsnem.21.1.48
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Abstract

Exercise and nutrition are often used in combination to lose body fat and reduce weight. In this respect, exercise programs are as important as correct nutrition. Several issues are still controversial in this field, and among them there are contrasting reports on whether training in a fasting condition can enhance weight loss by stimulating lipolytic activity. The authors’ purpose was to verify differences in fat metabolism during training in fasting or feeding conditions. They compared the effect on oxygen consumption (VO 2) and substrate utilization, estimated by the respiratory-exchange ratio (RER), in 8 healthy young men who performed the same moderate-intensity training session (36 min of cardiovascular training on treadmill at 65% maximum heart rate) in the morning in 2 tests in random sequence: FST test (fasting condition) without any food intake or FED test (feeding condition) after breakfast. In both cases, the same total amount and quality of food was assumed in the 24 hr after the training session. The breakfast, per se, increased both VO 2 and RER significantly (4.21 vs. 3.74 and 0.96 vs. 0.84, respectively). Twelve hours after the training session, VO 2 was still higher in the FED test, whereas RER was significantly lower in the FED test, indicating greater lipid utilization. The difference was still significant 24 hr after exercise. The authors conclude that when moderate endurance exercise is done to lose body fat, fasting before exercise does not enhance lipid utilization; rather, physical activity after a light meal is advisable.

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  • Dietary intake assessment demonstrated substantial similarity, verifying that none of the subjects modified their nutritional behaviour during the intervention protocol.

    “To verify that none of the subjects modified their nutritional behaviour during the intervention protocol (the day before and during the test day) an assessment of dietary intake was performed and analysed using DietComp® (Caldogno, Vicenza, Italy) software demonstrating a substantial similarity [24].”

    From High-Intensity Interval Resistance Training (HIRT) influences resting energy expenditure and respiratory ratio in non-dieting individuals (2012) · cites this paper as [24]

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Authors
Paoli, A., Marcolin, G., Zonin, F., Neri, M., Sivieri, A., & Pacelli, Q. F.
Affiliations
University of Padua (IT)
ORCID
Venue
International Journal of Sport Nutrition and Exercise Metabolism
Publisher
Human Kinetics
Published
2011-02
Volume
21
Issue
1
Pages
48-54
ISSN
  • 1526-484X (ISSN-L)
  • 1543-2742
DOI
10.1123/ijsnem.21.1.48
OpenAlex
W2102298167
Cited by
45
References
42
Citations by year
2025: 2 · 2024: 4 · 2023: 1 · 2022: 2 · 2021: 1 · 2020: 4 · 2019: 2 · 2018: 7 · 2017: 4 · 2016: 1 · 2015: 6 · 2014: 5 · 2013: 2 · 2012: 2
FWCI
9.40
Type
journal article
Language
en
Open access
closed
Locations
  • International Journal of Sport Nutrition and Exercise Metabolism (publishedVersion)
  • PubMed (publishedVersion)
  • Padua Research Archive (University of Padova) (submittedVersion)
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 › Dietary Effects on Health
Keywords
fed state, endurance training, fat loss, respiratory exchange ratio, excess post-exercise oxygen consumption, substrate utilization, lipid utilization, oxygen consumption, meal timing, weight loss
MeSH terms
Adipose Tissue, Adult, Diet, Reducing, Fasting, Humans, Male, Oxygen Consumption, Physical Endurance, Weight Loss, Exercise, Lipid Metabolism, Respiratory Rate

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