Article

Objective: To validate the 20-meter shuttle walking test (20MST) in the assessment of maximal oxygen consumption ((V)over dotO(2)max) and maximal speed in patients with coronary artery disease (CAD). Design: Single-sample validity study. Setting: Cardiac rehabilitation service in France. Participants: Seventeen men with CAD. Interventions: Subjects underwent a symptom-limited treadmill test (SLTT) in a laboratory, with a speed starting at 2.5km/h and increasing by 0.5km/h every minute, and performed an adapted 20MST in a corridor, with a speed starting at 3km/h and increasing by 1km/h every minute until exhaustion. Main Outcome Measures: (V)over dotO(2), measured during the 20MST with the Cosmed K2 telemetric gas analyzer (K2 (V)over dotO2), estimated (V)over dotO(2) calculated by the Leger equation (Leger (V)over dotO(2)) from the maximal speed obtained during the 20MST, and (V)over dotO(2) measured during the SLTT (SLTT (V)over dotO(2)). Maximal speeds attained on the treadmill and on the 20MST were also compared. Results: A significant (P<.0001) difference was observed between the Leger estimate of (V)over dotO(2) and those of K2 (V)over dotO(2) and SLTT (V)over dotO(2) (mean&PLUSMN;standard deviation, 12.28&PLUSMN;5.90mL.min(-1).kg(-1) vs 23.04&PLUSMN;7.17 and 22.56&PLUSMN;6.29mL.min(-1).kg(-1)). No difference was found between the treadmill and the 20MST maximal speeds (6.73&PLUSMN;0.91km/h, 6.78&PLUSMN;1.23km/h, respectively). Measured with the Cosmed K2, a significant relationship existed between (V)over dotO(2), and each speed level (r=.95, P<0001; (V)over dotO(2)-4.24X speed-7.37, standard estimation error=2.29mL.min(-1).kg(-1)). Conclusion: Maximal (V)over dotO(2) and maximal speed measured on the treadmill did not differ significantly from those obtained on the 20MST. The cur-rent 20MST equation (Leger equation) was not valid to estimate (V)over dotO(2) in CAD patients. A modified prediction equation of (V)over dotO(2) was given and would need a larger number of patients to be generalized.

Langue : ANGLAIS

Identifiant basis : 2003227868