Cardiorespiratory requirements and reproducibility of the six-minute walk test in elderly patients with coronary artery disease 11No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit upon the author(s) or upon any organization with which the author(s) is/are associated.

Gayda M, Temfemo A, Choquet D, Ahmaı̈di S. Cardiorespiratory requirements and reproducibility of the six-minute walk test in elderly patients with coronary artery disease. Arch Phys Med Rehabil 2004;85:1538-43. Objectives To measure the cardiorespiratory requirements of the six-minute walk test (6MWT), to compare this demand with the symptom-limited exercise test (SLET) at ventilatory threshold and at maximal level in elderly patients with coronary artery disease (CAD), and to assess the reproducibility of the 6MWT in cardiorespiratory exchanges in those patients. Design Comparative and reproducibility sample. Setting Cardiac rehabilitation service. Participants Twenty-five people with CAD. Interventions Subjects performed an SLET and a 6MWT. To test 6MWT reproducibility, 9 patients performed 2 repeated 6MWTs. Main outcome measures The 6MWT cardiorespiratory values, measured with a portable gas analyzer, were compared with the SLET data and with the data from the 2 repeated 6MWTs. Results The 6MWT peak oxygen uptake (Vo2peak, 14.27±2.94mL·min−1·kg−1) and heart rate (94±14 beats/min) did not differ from the SLET values at ventilatory threshold (V̇o2, 13.4±2.65mL·min−1·kg−1; heart rate, 91±17 beats/min), whereas the 6MWT ventilation (Vepeak, 36.72±10.03L/min) was higher than the SLET at ventilatory threshold (V̇e, 31.54±8.93L/min, P<.03). Maximal 6MWT cardiorespiratory data were lower than the SLET maximal values. Cardiorespiratory values did not differ between the 2 repeated 6MWT (Vo2peak, 15.33±3.52mL·min−1·kg−1 vs 15.11±2.65mL·min−1·kg−1; Vepeak, 39.07±12.33L/min vs 39.07±12.13L/min; heart rate, 95±21 beats/min vs 89±15 beats/min). Conclusions The 6MWT cardiorespiratory requirement values did not differ from SLET values at ventilatory threshold except for ventilation, and 6MWT values are reproducible in elderly patients with CAD.