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Reliability and Construct Validity of Yo-Yo Tests in Untrained and Soccer-Trained Schoolgirls Aged 9–16

2015; Human Kinetics; Volume: 28; Issue: 2 Linguagem: Inglês

10.1123/pes.2015-0212

1543-2920

Susana Póvoas, Carlo Castagna, José Manuel da Costa Soares, Pedro Silva, Manuel J. Coelho‐e‐Silva, Fernando Matos, Peter Krustrup,

Children's Physical and Motor Development

Purpose: The reliability and construct validity of three age-adapted-intensity Yo-Yo tests were evaluated in untrained ( n = 67) vs. soccer-trained ( n = 65) 9- to 16-year-old schoolgirls. Methods: Tests were performed 7 days apart for reliability (9- to 11-year-old: Yo-Yo intermittent recovery level 1 children’s test; 12- to 13-yearold: Yo-Yo intermittent endurance level 1; and 14- to 16-year-old: Yo-Yo intermittent endurance level 2). Results: Yo-Yo distance covered was 40% (776 ± 324 vs. 556 ± 156 m), 85% (1252 ± 484 vs. 675 ± 252 m) and 138% (674 ± 336 vs. 283 ± 66 m) greater ( p ≤ .010) for the soccer-trained than for the untrained girls aged 9–11, 12–13 and 14–16 years, respectively. Typical errors of measurement for Yo-Yo distance covered, expressed as a percentage of the coefficient of variation (confidence limits), were 10.1% (8.1–13.7%), 11.0% (8.6–15.4%) and 11.6% (9.2–16.1%) for soccer players, and 11.5% (9.1–15.8%), 14.1% (11.0–19.8%) and 10.6% (8.5–14.2%) for untrained girls, aged 9–11, 12–13 and 14–16, respectively. Intraclass correlation coefficient values for test-retest were excellent (0.795–0.973) in both groups. No significant differences were observed in relative exercise peak heart rate (%HR peak ) between groups during test and retest. Conclusion: The Yo-Yo tests are reliable for determining intermittent-exercise capacity and %HR peak for soccer players and untrained 9- to 16-year-old girls. They also possess construct validity with better performances for soccer players compared with untrained age-matched girls, despite similar %HR peak .