A validation of the 10-meter incremental shuttle walk test as a measure of aerobic power in cardiac and rheumatoid arthritis patients

Abstract

MacSween A, Johnson NJL, Armstrong G, Bonn J. A validation of the 10-meter incremental shuttle walk test as a measure of aerobic power in cardiac and rheumatoid arthritis patients. Arch Phys Med Rehabil 2001;82:807-10. Objective: To validate a simple, clinically relevant, and inexpensive test of aerobic power—the 10-meter incremental shuttle walk test (SWT)—in 2 separate patient populations. Design: Two-sample validity study. Setting: Physiotherapy department of major hospital in the United Kingdom. Patients: Convenience samples of rheumatoid arthritis (RA) patients (n = 10) and cardiac patients (n = 10). Intervention: Subjects were attached to a portable respiratory gas analyzer to measure oxygen uptake. They walked around an oval 10-meter course, starting at 0.5m/s, with velocity gradually increased by.17m/s increments for as long as they could, for up to 12 minutes. Main Outcome Measures: A subject's maximal rate of oxygen uptake during exercise (V̇O2max) established with linear extrapolation was regressed against the number of shuttles completed (distance walked). An earlier study (n = 28) showed high levels of reliability and validity with linear extrapolation. Results: No significant linear relationship was found between V̇O2max and the number of shuttles completed (R2; RA subjects = 9.7%, cardiac subjects =.03%, p >.05). Conclusion: These results do not support use of the SWT as a representative measure of aerobic power. Despite this finding, the advantages of developing a clinically viable alternative to costly laboratory testing warrants further study of the SWT in patient groups.