Journal article
Fat oxidation at rest predicts peak fat oxidation during exercise and metabolic phenotype in overweight men
Department of Biomedical Sciences, Center for Healthy Aging, University of Copenhagen, Copenhagen, Denmark.1
To elucidate if fat oxidation at rest predicts peak fat oxidation during exercise and/or metabolic phenotype in moderately overweight, sedentary men. Cross-sectional study. We measured respiratory exchange ratio (RER) at rest in 44 moderately overweight, normotensive and normoglycemic men and selected 8 subjects with a low RER (L-RER, body mass index (BMI): 27.9+/-0.9 kg m(-2), RER: 0.76+/-0.02) and 8 with a high RER (H-RER; BMI 28.1+/-1.1 kg m(-2), RER: 0.89+/-0.02).
After an overnight fast, a venous blood sample was obtained and a graded exercise test was performed. Fat oxidation during exercise was quantified using indirect calorimetry. Peak fat oxidation during exercise was higher in L-RER than in H-RER (0.333+/-0.096 vs 0.169+/-0.028 g min(-1); P<0.01) and occurred at a higher relative intensity (36.2+/-6.6 vs 28.2+/-3.1% VO(2max), P<0.05).
Using the International Diabetes Federation criteria, we found that there was a lower accumulation of metabolic risk factors in L-RER than in H-RER (1.6 vs 3.5, P=0.028), and no subjects in L-RER and four of eight subjects in H-RER had the metabolic syndrome. Resting RER was positively correlated with plasma triglycerides (P<0.01) and negatively with plasma free fatty acids (P<0.05), and peak fat oxidation during exercise was positively correlated with plasma free fatty acid concentration at rest (P<0.05).
A low RER at rest predicts a high peak fat oxidation during exercise and a healthy metabolic phenotype in moderately overweight, sedentary men.
Language: | English |
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Publisher: | Nature Publishing Group UK |
Year: | 2010 |
Pages: | 871-7 |
ISSN: | 14765497 and 03070565 |
Types: | Journal article |
DOI: | 10.1038/ijo.2010.11 |
ORCIDs: | Stallknecht, B M and Helge, J W |
Adult Basal Metabolism Body Mass Index Calorimetry, Indirect Cross-Sectional Studies Exercise Fasting Fatty Acids, Nonesterified Humans Lipid Metabolism Male Overweight Oxidation-Reduction Oxygen Consumption Phenotype Rest Sedentary Behavior Triglycerides exercise lipid metabolism metabolic syndrome phenotypes rest