AI Article Synopsis
- Cardiopulmonary exercise testing is crucial for assessing the safety and fitness levels of obese adolescents before starting exercise programs, with a focus on the respiratory gas exchange ratio (RER) as an indicator of maximal effort.
- A study involving 34 obese and 18 lean adolescents revealed that the RERpeak and RER slope were significantly lower in obese individuals, suggesting a potential issue with using RER as a reliable measure of maximal exercise effort in this group.
- The findings indicate that the reduced RERpeak in obese adolescents has important implications for how cardiopulmonary exercise tests are conducted and interpreted for this population.
Article Abstract
Background: Cardiopulmonary exercise testing is advised ahead of exercise intervention in obese adolescents to assess medical safety of exercise and physical fitness. Optimal validity and reliability of test results are required to identify maximal exercise effort. As fat oxidation during exercise is disturbed in obese individuals, it remains an unresolved methodological issue whether the respiratory gas exchange ratio (RER) is a valid marker for maximal effort during exercise testing in this population.
Methods: RER during maximal exercise testing (RERpeak), and RER trajectories, was compared between obese and lean adolescents and relationships between RERpeak, RER slope and subject characteristics (age, gender, Body Mass Index [BMI], Tanner stage, physical activity level) were explored. Thirty-four obese (BMI: 35.1±5.1 kg/m²) and 18 lean (BMI: 18.8±1.9 kg/m²) adolescents (aged 12-18 years) performed a maximal cardiopulmonary exercise test on bike, with comparison of oxygen uptake (VO2), heart rate (HR), expiratory volume (VE), carbon dioxide output (VCO2), and cycling power output (W).
Results: RERpeak (1.09±0.06 vs. 1.14±0.06 in obese vs. lean adolescents, respectively) and RER slope (0.03±0.01 vs. 0.05±0.01 per 10% increase in VO2, in obese vs. lean adolescents, respectively) was significantly lower in obese adolescents, and independently related to BMI (P<0.05). Adjusted for HRpeak and VEpeak, RERpeak and RER slope remained significantly lower in obese adolescents (P<0.05). RER trajectories (in relation to %VO2peak and %Wpeak) were significantly different between groups (P<0.001).
Conclusions: RERpeak is significantly lowered in obese adolescents. This may have important methodological implications for cardiopulmonary exercise testing in this population.
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| http://dx.doi.org/10.23736/S0022-4707.16.06607-X | DOI Listing |
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