%0 Journal Article %A Luciana Di Thommazo-Luporini %A Rafael L. L Luporini %A Camila B.F. Pantoni %A Renata Trimer %A Adalberto F. Martinez %A Bruno Archiza %A Aparecida M. Catai %A Audrey Borghi-Silva %T Oxygen uptake kinetic during hallway and treadmill six-minute walking tests in obese women %D 2013 %J European Respiratory Journal %P P1346 %V 42 %N Suppl 57 %X Background: The analysis of the VO2 kinetic is useful to evaluate the functional capacity. The 6-minute walking test (6MWT) is widely used to assess exercise capacity, but as it requires a 30-m hallway, performing the 6MWT on a treadmill (t-6MWT) is often used in cases of physical space limitations. However, the VO2 kinetic during functional walking tests in the obese population is not clear. Objectives: To analyze and compare VO2 kinetic during 6MWT and t-6MWT in obese women. Methods: Seventeen women (38±5 years old; body mass index = 38±5 kg/m²) performed randomly the 6MWT, according to the ATS guidelines, and the t-6MWT with an interval ≥ 48h wearing a portable metabolic system (Oxycon Mobile®). In both tests, volunteers received the same instructions. For the VO2 kinetic analysis, a monoexponential fit was performed to obtain: baseline (BL), tau (τ), amplitude (A), time delay (TD) and mean response time (MRT). The agreement between the tests was evaluated by the Bland-Altman analysis. Data are reported in median (1st quartile-3rd quartile). Results: At the onset of the t-6MWT, the τ and MRT were slower [43,1s (37-60) vs 28,7s (23-38), p=0.0007; 59,6s (53-71) vs 43,0s (38-49), p<0.0001, respectively] than in 6MWT. Bland-Altman plot demonstrated agreement between both tests to identify VO2 at the peak of exercise (mean difference = 138.6ml.min-1; limits of agreement: -631.7 to 908.8). Conclusion: Besides both tests have demonstrated agreement to identify the VO2 peak, the t-6MWT leads to a slower VO2 kinetic than the 6MWT in obese women. Financial support: FAPESP 2009/01842-0 and CNPq 141331/2011-9. %U https://erj.ersjournals.com/content/erj/42/Suppl_57/P1346.full.pdf