The Respiratory Exchange Ratio is Associated with Fitness Indicators Both in Trained and Untrained Men: A Possible Application for People with Reduced Exercise Tolerance

• Published in: Clinical medicine circulatory, respiratory, and pulmonary medicine respiratory, and pulmonary medicine, 2008-01, Vol.2008 (2), p.1
• Main Authors: Ramos-Jiménez, Arnulfo, Hernández-Torres, Rosa P., Torres-Durán, Patricia V., Romero-Gonzalez, Jaime, Mascher, Dieter, Posadas-Romero, Carlos, Juárez-Oropeza, Marco A.
• Format: Article
• Language: English
• Subjects: Heart beat; Physiological aspects
• ISSN: 1179-5484; 1178-1157; 1179-5484; 1178-1157
• DOI: 10.4137/CCRPM.S449

Arnulfo Ramos-Jiménez1, Rosa P. Hernández-Torres2, Patricia V. Torres-Durán3, Jaime Romero-Gonzalez4, Dieter Mascher5, Carlos Posadas-Romero6 and Marco A. Juárez-Oropeza3 1Department of Basic Science, Biomedical Science Institute, UACJ, Cd. Juarez Chih, Mexico. 2School of Physical Education and Sport Sciences, UACH, Chihuahua, Chih., Mexico. 3Department of Biochemistry, School of Medicine, National Autonomous University of Mexico, D.F., 04510, Mexico. 4Chemistry School, University of Guanajuato, Guanajuato, Gto., Mexico. 5Department of Physiology, School of Medicine, National Autonomous University of Mexico, D.F., 04510, Mexico. 6Department of Endocrinology, National Institute of Cardiology, I.CH., D.F., Mexico. Abstract Background: The respiratory exchange ratio (RER) indirectly shows the muscle´s oxidative capacity to get energy. Sedentarism, exercise and physically active lifestyles modify it. For that reason, this study evaluates the associations between RER during sub-maximum exercise and other well established fitness indicators (body fat, maximum heart rate, maximum O2 uptake, workload, and lactate threshold), in physically active trained and untrained men. Methods: The RER, O2 uptake and blood lactate were measured in eight endurance trained and eight untrained men (age, 22.9 ± 4.5 vs. 21.9 ± 2.8 years; body mass, 67.1 ± 5.4 vs. 72.2 ± 7.7 kg; body fat, 10.6 ± 2.4% vs. 16.6 ± 3.8% and maximum O2 uptake, 68.9 ± 6.3 vs. 51.6 ± 5.8 ml*kg−1*min−1), during maximum exercise test and during three different sub-maximum exercises at fixed workload: below, within or above the lactate threshold. Results: Endurance trained men presented higher O2 uptake, lower blood lactate concentrations and lower RER values than those in untrained men at the three similar relative workloads. Even though with these differences in RER, a strong association (p < 0.05) of RER during sub-maximum exercise with the other well established fitness indicators was observed, and both maximum O2 uptake and lactate threshold determined more than 57% of its variance (p < 0.05). Conclusions: These data demonstrate that RER measurement under sub-maximum exercise conditions was well correlated with other established physical fitness indicators, despite training condition. Furthermore, the results suggest that RER could help obtain an easy approach of fitness status under low exercise intensity and could be utilized in subjects with reduced exercise tolerance.