Criterion-related validity of the 20-m shuttle run test in youths aged 13–19 years

Abstract

We assessed the agreement between maximal oxygen consumption ([Vdot]O_2max) measured directly when performing the 20-m shuttle run test and estimated [Vdot]O_2max from five different equations (i.e. Barnett, equations a and b; Léger; Matsuzaka; and Ruiz) in youths. The 20-m shuttle run test was performed by 26 girls (mean age 14.6 years, s = 1.5; body mass 57.2 kg, s = 8.9; height 1.60 m, s = 0.06) and 22 boys (age 15.0 years, s = 1.6; body mass 63.5 kg, s = 11.5; height 1.70 m, s = 0.01). The participants wore a portable gas analyser (K4b2, Cosmed) to measure [Vdot]O₂ during the test. All the equations significantly underestimated directly measured [Vdot]O_2max, except Barnett's (b) equation. The mean difference ranged from 1.3 ml · kg⁻¹ · min⁻¹ (Barnett (b)) to 5.5 ml · kg⁻¹ · min⁻¹ (Léger). The standard error of the estimate ranged from 5.3 ml · kg⁻¹ · min⁻¹ (Ruiz) to 6.5 ml · kg⁻¹ · min⁻¹ (Léger), and the percentage error ranged from 21.2% (Ruiz) to 38.3% (Léger). The accuracy of the equations available to estimate [Vdot]O_2max from the 20-m shuttle run test is questionable at the individual level. Furthermore, special attention should be paid when comparisons are made between studies (e.g. population-based studies) using different equations. The results of the present study suggest that Barnett's (b) equation provides the closest agreement with directly measured [Vdot]O_2max (cardiorespiratory fitness) in youth.

Keywords:

• Cardiorespiratory fitness
• maximal test
• Bland-Altman
• youth

Acknowledgements

The study was partially funded by the MCTES/FCT – PTDC-DES-72424-2006, the Spanish Ministry of Education (EX-2007-1124) and the European Union, in the framework of the public Health Programme (ALPHA project, Ref: 2006120).