Cross Validation of the 20-m Shuttle Run Test for Children and Adolescents with Mental Retardation

in Adapted Physical Activity Quarterly
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  • 1 The George Washington University Medical Center
  • 2 Andrews University
  • 3 Wichita State University
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We cross validated the 20-m shuttle run test of aerobic capacity in children and adolescents with mild and moderate mental retardation (MR) using the population specific formula of Fernhall et al. (1998). Nine boys and 8 girls (age = 13.7 yr) completed a maximal treadmill protocol (measured V̇O2peak) and a 20-m shuttle run (predicted V̇O2peak). The measured peak oxygen consumption (V̇O2peak) was 39.4 ml kg-1 min-1. The relationship between measured and predicted V̇O2peak was r = .86 with an SEE of 6.2 ml kg-1 min-1. Multiple regression and Bland-Altman analyses showed that there was little bias, but the Bland-Altman analysis indicated highly variable limits of agreement (Bland & Altman 1986). Thus, the traditional approach (regression analysis) to concurrent validity revealed that the 20-m shuttle run is a valid indicator of V̇O2peak in these participants. The accuracy of prediction (Bland & Altman, 1986), however, was lower than expected in a population without MR.

Bo Fernhall is now with the Exercise Science Department at Syracuse University, Syracuse, NY 13244, E-mail: <>; A. Lynn Millar is with the Department of Physical Therapy at Andrews University, Berrien Springs, MI; Kenneth Pitetti, Terri Hensen, and Mathew Vukovich are with the College of Health Professions at Wichita State University, Wichita, KS 67260-0152.