Abstract

HALL-LOPEZ, Javier Arturo et al. Reliability of the maximal oxygen uptake following two consecutive trials by indirect calorimetry. Nutr. Hosp. [online]. 2015, vol.31, n.4, pp.1726-1732. ISSN 1699-5198.  https://dx.doi.org/10.3305/nh.2015.31.4.8487.

Background: The maximal oxygen uptake (VO_2máx) assessment by indirect calorimetry is the most reliable method to determine VO_2máx, but when repeated tests are conducted, the results have been controversial. Aim: To determine the reliability of the maximal oxygen uptake (VO_2máx) in healthy adults following two consecutive trials with 10 min rest between trials using the Bruce protocol. Methods: Participants were 6 males apparently healthy physically active (Mean age=23,4±1,3 years), who performed twice the Bruce protocol and after reaching their VO_2máx in the first trial they stepped down the treadmill and rested seated on a chair during 10 min. Results: The data analysis showed high reproducibility values between tests, indicated by the correlation coefficient Pearson product moment and R squared with confidence intervals at 95% (CI95%), the correlation of the maximum oxygen consumption was VO_2máx =0.907 with a R²=0.823, the maximum heart rate was HR_máx =0.786, with R²=0.618 and the rate of ventilation and carbon dioxide elimination was VE/VCO₂=0.868, with an R²=754. No adverse effects were reported during the 10 min rest between trials. Conclusion: Resting 10 min between consecutive maximal exercise tests using Bruce protocol treadmill tests does not affect VO_2máx in healthy young adults. It is feasible and reliable to perform maximal treadmill tests in a single session without adverse effects for the participant.

Keywords : Maximal Oxygen Uptake; Maximum Heart Rate; Ventilatory Equivalent Ratio for Elimination of Carbon Dioxide.

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