• Arch Phys Med Rehabil · Sep 2004

    Intensity and daily reliability of the six-minute walk test in moderate chronic heart failure patients.

    • Gaëlle Kervio, Nathalie S Ville, Christophe Leclercq, Jean-Claude Daubert, and François Carré.
    • Groupe de Recherche Cardio-Vasculaire, Université de Rennes 1, France. gaelle.kervio@club-internet.fr
    • Arch Phys Med Rehabil. 2004 Sep 1; 85 (9): 1513-8.

    ObjectiveTo assess the intensity and daily reliability of the six-minute walk test (6MWT) in patients with moderate chronic heart failure (CHF).DesignEvaluation of testing protocol.SettingHospitalized care.ParticipantsCHF patients under optimal drug treatment (CHF-D, n=12) or optimal drug treatment plus multisite cardiac pacing (CHF-P, n=12).InterventionsNot applicable.Main Outcome MeasuresPeak values of oxygen uptake (VO2) and heart rate during a symptom-limited, treadmill exercise test and VO2, heart rate, and distance during 2 6MWT sessions (morning and afternoon). The 6MWT intensity was estimated by the ratio (%) of VO2 and heart rate values measured at the end of this test in relation to the respective peak values obtained during the treadmill exercise test.ResultsSubjects' VO2 and heart rate during the 6MWT were lower (P<.001) and were about 90% of the peak values (VO2: CHF-D, 90.5%+/-11.1%; CHF-P, 93.0%+/-13.2%; heart rate: CHF-D, 90.6%+/-6.6%; CHF-P, 91.4%+/-9.6%). The distance walked during both 6MWT sessions did not differ significantly, with low coefficients of variation (< or =2.0%) and high intraclass correlation coefficients (> or =.98). In CHF-D only, the patients' VO2 and heart rate were significantly (P<.01, P<.05, respectively) higher during the afternoon session.ConclusionsDespite an intensity significantly lower but close to that of the symptom-limited exercise test, the 6MWT was well tolerated in both CHF groups. In these populations, the 6MWT is reliable on a daily basis, for the distance walked. However, for assessing VO2 and heart rate values in CHF-D patients, the 6MWT must always be performed at the same time of day.

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