Abstract
The Incremental Shuttle Walk Test (ISWT) has been increasingly used and may constitute a method for assessing functional capacity in obese population. However, if ISWT represents maximal exercise effort and produces similar cardiorespiratory responses in obese women remains to be investigated. The aims was compare the cardiorespiratory responses between obese and eutrophic during the ISWT and the cardiopulmonary exercise testing (CPET). Twenty-nine women (17 obese), allocated in the obese group (OG) and eutrophic group (EG), performed two ISWT and a CPET on a treadmill (Bruce protocol). Heart rate (HR) was determined before and after each test. Ventilatory (VE) and metabolic (VO2; VCO2) measurements were collected breath by breath with a portable ergoespirometer (Oxycon mobile; CareFusion-Germany). We considered the results of the second ISWT to statistical analysis. Oxygen uptake (ml/kg/min) as well as distance walked and time of the test were significantly lower in the OG in both tests (ISWT: p<0.001, <0.001, <0.001; CPET: p<0.001, =0.016, =0.001; respectively). Both tests showed correlation between distance and VO2 (ml/kg/min) and HR (ISWT: r=0.83, r=0.68; CPET: r=0.53 ,r=0.52, respectively). Comparing the methods the ISWT was able to elicit ventilatory, metabolic and cardiovascular responses in agreement with CPET. In addition, it was observed the agreement of both tests to identify relative VO2, VE and HR at the peak of exercise. The ISWT seemed to be an adequate method to assess functional limitation in obese women and promote ventilatory, metabolic and cardiopulmonary responses in agreement to the CPET.
Grants: FAPESP (09/01842-0;10/03030-0).
- © 2011 ERS
