Oxygen consumption during corridor walk testing in chronic cardiac failure

Abstract

We have examined the use of a 6-min corridor walk test in the assessment of functional capacity in 16 patients with chronic cardiac failure. VO2 was determined concurrently by a portable 'Oxylog'. Three tests were performed sequentially, and although there was a significant increase in distance walked and highest VO2 achieved between the first and second tests, good reproducibility was attained between the second and third tests. Both walk test variables correlated well with previously determined peak achieved VO2, and NYHA classes were separated adequately. Corridor walk testing, with or without measurement of VO2 should be a useful adjunct to maximal exercise testing in interventional studies.

Insuficiência cardíaca: comparação entre o teste de caminhada de seis minutos e o teste cardiopulmonar

“…Our study was able to show that two critical variables, the DW in 6MWT' and peak VO 2 in the CPET have a correlation at a moderate level and statistically significant at peak exertion in patients with HF functional class I -II (r = 0.70; p = 0.002). Previous studies 10,17 confirm our results showing a good correlation between the results of the 6MWT' and CPET 12,20,21 . Faggiano et al 20 in a sample of 26 patients with HF (NYHA II -IV), found a significant correlation between the DW in the 6MWT' and peak VO 2 reached in the CPET (r = 0.63).…”

“…As a consensus, most studies found in the literature have used the application of more than one test to determine the distance walked, since this procedure can improve patients' familiarity with the technique 5,8,12 . Corroborating our findings, Cahalin et al 10 The cardiopulmonary stress test has been widely used in the objective measurement of the VO 2 , and is currently considered the reference standard in assessing the functional capacity funcional 16,17 . It has long been used as a predictor of morbidity and mortality in HF patients, as demonstrated by Gitt et al 18 in a study involving 223 patients with HR that showed that the group of patients with peak VO 2 ≤ 14 ml/kg/min or VO 2 at anaerobic threshold < 11 ml/kg/min had a greater risk of death.…”

Gait analysis in chronic heart failure: The calf as a locus of impaired walking capacity

“…Indeed, preferred walking speed has been reported to be $ 30% lower in CHF compared to healthy age-matched control groups (Beneke and Meyer, 1997;Figueiredo et al, 2013) and walking endurance decreases with increasing severity of the disease (Riley et al, 1992). Notably, walking capacity has also been directly linked with hospitalization and mortality rates in CHF (Forman et al, 2012).…”

Diferentes padronizações do teste da caminhada de seis minutos como método para mensuração da capacidade de exercício de idosos com e sem cardiopatia clinicamente evidente

“…The submaximal 13,11 6MWT is the renowned worldwide; however, there is a linear correlation between total distance covered and peak oxygen consumption (VO 2peak ) obtained through cardiopulmonary test 14,15,9 .…”