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Yo-Yo Intermittent Recovery Test Level 2 and Its Relationship With Other Typical Soccer Field Tests in Female Collegiate Soccer Players

Lockie, Robert G.1; Jalilvand, Farzad2; Moreno, Matthew R.2; Orjalo, Ashley J.1; Risso, Fabrice G.2; Nimphius, Sophia3

Journal of Strength & Conditioning Research: October 2017 - Volume 31 - Issue 10 - p 2667–2677
doi: 10.1519/JSC.0000000000001734
Original Research

Abstract: Lockie, RG, Jalilvand, F, Moreno, MR, Orjalo, AJ, Risso, FG, and Nimphius, S. Yo-Yo intermittent recovery test level 2 and its relationship with other typical soccer field tests in female collegiate soccer players. J Strength Cond Res 31(10): 2667–2677, 2017—The ability to complete high-intensity running is essential for soccer. The Yo-Yo Intermittent Recovery Test Level 2 (YYIRT2) can measure this capacity, but there is limited information regarding this assessment in collegiate female soccer players. This study investigated the YYIRT2 as a measure of high-intensity running in this population, and its relationship to other soccer field tests. Twenty-one players from a Division I team were recruited. In addition to the YYIRT2, subjects completed linear (0–5, 0–10, and 0–30 m sprint intervals) and change-of-direction (pro-agility and 60-yard shuttle) speed tests, as well as the YYIRT Level 1 (YYIRT1), to assess relationships with YYIRT2 by correlations (p ≤ 0.05). The correlation of YYIRT1 with the speed tests was also assessed. The YYIRT1 and YYIRT2 were standardized using z-scores for comparison with elite benchmarks to investigate relative performance on each test. The YYIRT2 and YYIRT1 distances did not significantly correlate with those of the speed tests (r = −0.251 to 0.274). There was a large relationship between YYIRT2 and YYIRT1 distances (r = 0.582), although the explained variance was low (33.87%). Mean YYIRT2 z-scores (−4.29 ± 1.66) indicated a performance further from elite benchmarks than those of the YYIRT1 (−1.92 ± 1.61), and 90.5% (19 of 21) subjects performed relatively better in the YYIRT1 than YYIRT2. The YYIRT2 provided a more specific measure of high-intensity running to that of the YYIRT1 in collegiate female soccer players. Coaches may consider using the YYIRT2 to gauge and track progress of high-intensity running capabilities and create training programs to improve this ability in female players.

1Department of Kinesiology, California State University, Fullerton, Fullerton, California;

2Department of Kinesiology, California State University, Northridge, Northridge, Los Angeles, California; and

3Center for Exercise and Sports Science Research, School of Medical and Health Sciences, Edith Cowan University, Joondalup, Australia

Address correspondence to Robert G. Lockie, rlockie@fullerton.edu.

Copyright © 2017 by the National Strength & Conditioning Association.