Validity of a modified shuttle test in adult cystic fibrosis

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Abstract
BACKGROUND The purpose of this study was to provide some evidence of the validity of a modified shuttle test (MST) by comparing performance on the MST with peak oxygen consumption (V˙o 2peak) measured during a treadmill test in a group of adult patients with cystic fibrosis. METHOD Twenty patients with stable cystic fibrosis performed a ramped maximal treadmill test (STEEP protocol) and the MST using a randomised balanced design. RESULTS The relationship between the distance achieved on the MST andV˙o 2peak was strong (r = 0.95, p2peak explained by the variance in MST distance. The relationship was represented by the regression equation (with 95% confidence intervals)V˙o 2peak = 6.83 (2.85 to 10.80) + 0.028 (0.019 to 0.024) × MST distance. CONCLUSION This study provides evidence of the construct validity of the MST as an objective measure of exercise capacity in adults with cystic fibrosis.