title: 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 (VO2max) measured directly when performing the 20-m shuttle run test and estimated VO2max from five different equations (i.e., Barnett, equations a and b; Leger; 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 VO2max during the test. All the equations significantly underestimated directly measured VO2max, except Barnett's (b) equation. The mean difference ranged from 1.3 ml x kg(-1) x min(-1) (Barnett (b)) to 5.5 ml x kg(-1) x min(-1) (Leger). The standard error of the estimate ranged from 5.3 ml x kg(-1) x min(-1) (Ruiz) to 6.5 ml x kg(-1) x min(-1) (Leger), and the percentage error ranged from 21.2% (Ruiz) to 38.3% (Léger). The accuracy of the equations available to estimate VO2max 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 VO2max (cardiorespiratory fitness) in youth.
authors.affiliation: Unit for Preventive Nutrition, Department of Biosciences and Nutrition, NOVUM, Karolinska Institute, Huddinge, Sweden. ruizj@ugr.es
authors.forename: Jonatan R
authors.initials: JR
authors.lastname: Ruiz
authors.forename: Gustavo
authors.initials: G
authors.lastname: Silva
authors.forename: Norton
authors.initials: N
authors.lastname: Oliveira
authors.forename: José C
authors.initials: JC
authors.lastname: Ribeiro
authors.forename: Jose F
authors.initials: JF
authors.lastname: Oliveira
authors.forename: Jorge
authors.initials: J
authors.lastname: Mota
mesh_terms: D000293:Adolescent; D000704:Analysis of Variance; D054874:Athletic Performance / Q000502:physiology*; D005080:Exercise Test / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D010101:Oxygen Consumption; D012420:Running / Q000502:physiology*; D013647:Task Performance and Analysis; D055815:Young Adult