Exercise Fat Oxidation Is Positively Associated with Body Fatness in Men with Obesity: Defying the Metabolic Flexibility Paradigm

Isaac A. Chávez-Guevara, Rosa P. Hernández-Torres, Marina Trejo-Trejo, Everardo González-Rodríguez, Verónica Moreno-Brito, Abraham Wall-Medrano, Jorge A. Pérez-León and Arnulfo Ramos-Jiménez
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Isaac A. Chávez-Guevara: Chemical Biological Sciences PhD Graduate Program, Department of Chemical Sciences, Biomedical Sciences Institute, Ciudad Juarez Autonomous University, Chihuahua 32310, Mexico
Rosa P. Hernández-Torres: Faculty of Physical Culture Sciences, Autonomous University of Chihuahua, Chihuahua 31000, Mexico
Marina Trejo-Trejo: Faculty of Sports, Autonomous University of Baja California, Mexicali, Baja California 21289, Mexico
Everardo González-Rodríguez: Faculty of Medicine and Biomedical Sciences, Autonomous University of Chihuahua, Circuito Universitario, Campus II, Chihuahua 31109, Mexico
Verónica Moreno-Brito: Faculty of Medicine and Biomedical Sciences, Autonomous University of Chihuahua, Circuito Universitario, Campus II, Chihuahua 31109, Mexico
Abraham Wall-Medrano: Chemical Biological Sciences PhD Graduate Program, Department of Chemical Sciences, Biomedical Sciences Institute, Ciudad Juarez Autonomous University, Chihuahua 32310, Mexico
Jorge A. Pérez-León: Chemical Biological Sciences PhD Graduate Program, Department of Chemical Sciences, Biomedical Sciences Institute, Ciudad Juarez Autonomous University, Chihuahua 32310, Mexico
Arnulfo Ramos-Jiménez: Chemical Biological Sciences PhD Graduate Program, Department of Chemical Sciences, Biomedical Sciences Institute, Ciudad Juarez Autonomous University, Chihuahua 32310, Mexico

IJERPH, 2021, vol. 18, issue 13, 1-13

Abstract: Obesity is thought to be associated with a reduced capacity to increase fat oxidation in response to physical exercise; however, scientific evidence supporting this paradigm remains scarce. This study aimed to determine the interrelationship of different submaximal exercise metabolic flexibility (Metflex) markers and define its association with body fatness on subjects with obesity. Twenty-one male subjects with obesity performed a graded-intensity exercise protocol (Test 1) during which cardiorespiratory fitness (CRF), maximal fat oxidation (MFO) and its corresponding exercise intensity (FATmax) were recorded. A week afterward, each subject performed a 60-min walk (treadmill) at FATmax (Test 2), and the resulting fat oxidation area under the curve (TFO) and maximum respiratory exchange ratio (RER peak ) were recorded. Blood lactate (LA b ) levels was measured during both exercise protocols. Linear regression analysis was used to study the interrelationship of exercise Metflex markers. Pearson’s correlation was used to evaluate all possible linear relationships between Metflex and anthropometric measurement, controlling for CRF). The MFO explained 38% and 46% of RER peak and TFO’s associated variance ( p < 0.01) while TFO and RER peak were inversely related ( R 2 = 0.54, p < 0.01). Body fatness positively correlated with MFO ( r = 0.64, p < 0.01) and TFO ( r = 0.63, p < 0.01) but inversely related with RER peak ( r = −0.67, p < 0.01). This study shows that MFO and RER peak are valid indicators of TFO during steady-state exercise at FATmax. The fat oxidation capacity is directly associated with body fatness in males with obesity.

Keywords: energy metabolism; indirect calorimetry; physical exercise; antiobesity agents; aerobic exercise (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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