Translation of The research article is intermittent, supervised tests were developed and Yo Yo introduced in the 90s by Jens Bangsbo.and his associates at the University of Copenhagen, as they questioned the relevance ofthe laboratory based VO2max test.6 The Yo‐Yo tests consist of 20+20 m shuttle runs withincremental intensity and come in four different versions: Yo‐Yo IR1, Yo‐Yo IR2, Yo‐Yo IE1& Yo‐Yo IE2. Recoveries between each run are 5 s for IE‐tests and 10 s for IR tests. Level1 tests begin at lower speed, with smaller incremental increases compared to level 2tests. The IE versions are more aerobic than IR, and level 2 tests are more intensive thanlevel 1. Test scores are reported as completed level or completed distance in meters.The Yo‐Yo tests take several underlying performance variables into account: Aerobiccapacity, running economy, change‐of‐direction and recovery abilities. Correlationsbetween VO2 max and Yo‐Yo test performance is ~0.7.6,67,68 Correlations between Yo‐Yotest performance and high‐intensity running distance covered in games have beenreported in the range 0.54‐0.76.6,9,10,12,67,68 Due to their practicality and low expenses,the Yo‐Yo tests have been widely applied to assess players' abilities to repeatedlyperform high‐intensity exercise. IR1, IR2 and IE2 are most used in elite soccer.
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