Discriminative validity of the lower and upper quarter Y balance test performance : a comparison between healthy trained and untrained youth

GND
1209984954
LSF
59729
Affiliation
Division of Movement and Training Sciences/Biomechanics of Sport, University of Duisburg-Essen, Essen, Germany
Schwiertz, Gerrit;
GND
174003951
ORCID
0000-0002-4512-4491
Affiliation
Department of Health and Social Affairs, FHM Bielefeld - University of Applied Sciences, Bielefeld, Germany
Beurskens, Rainer;
GND
173826040
ORCID
0000-0001-7774-8664
LSF
58845
Affiliation
Division of Movement and Training Sciences/Biomechanics of Sport, University of Duisburg-Essen, Essen, Germany
Mühlbauer, Thomas

Abstract: Background The Lower (YBT-LQ) and Upper (YBT-UQ) Quarter Y Balance Test have been widely used for the assessment of dynamic balance and shoulder mobility/stability, respectively. However, investigations on the validity of the two tests in youth are lacking. Therefore, we performed two studies to determine discriminative validity of the YBT-LQ (study 1) and the YBT-UQ (study 2) in healthy youth.

Methods: Sixty-nine male soccer players (age: 14.4 ± 1.9 yrs) and 69 age-matched untrained male subjects (14.3 ± 1.6 yrs) participated in study 1 and 37 young swimmers (age: 12.3 ± 2.1 yrs) as well as 37 age−/sex-matched individuals (age: 12.5 ± 2.0 yrs) took part in study 2. Absolute (cm) and relative (% leg/arm length) maximal reach distances per reach direction and the composite score of the YBT-LQ/UQ were used as outcome measures. One-way analysis of variance and the receiver operator characteristic curve analysis (i.e., calculating the area under the curve [AUC]) were conducted to assess discriminative validity.

Results: Concerning the relative values, youth athletes showed significantly better YBT-LQ (study 1: p  < 0.001, d  = 0.86–1.21) and YBT-UQ (study 2: p  < 0.001, d  = 0.88–1.48) test performances compared to age- and sex-matched untrained subjects. Further, AUC-values indicated a chance of ≥74% (YBT-LQ) and ≥ 71% (YBT-UQ) to discriminate between youth athletes and controls. These findings were confirmed when using the absolute data for analysis.

Conclusions: According to our results, the YBT-LQ and the YBT-UQ seem to be useful test instruments to discriminate trained and untrained healthy youth performance for dynamic balance and shoulder mobility/stability, respectively.

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