Validity of a modified shuttle test in adult cystic fibrosis
- aSport and Exercise Sciences, University of Ulster at Jordanstown, Co. Antrim BT37 0QB, UK, bAdult Cystic Fibrosis Unit, Belfast City Hospital, Belfast, Co. Antrim BT9 7AB, UK
- Dr S Elborn.
- Received 21 April 1998
- Revision requested 8 July 1998
- Revised 2 October 1998
- Accepted 1 December 1998
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, p<0.01) with 90% of the variance in V˙o 2peak 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.
