The Yo-Yo IR2 Test: Physiological Response, Reliability, and Application to Elite Soccer

• DOI: 10.1249/01.mss.0000227538.20799.08
• Publication Date: 2006-09-06T09:12:30Z
• Authors: PETER KRUSTRUP; MAGNI MOHR; LARS NYBO; JACK MAJGAARD JENSEN; JENS JUNG NIELSEN; JENS BANGSBO
• Keywords: Sprint; Coefficient of variation; Treadmill

Purpose: To examine the physiological response, reliability, and validity of Yo-Yo intermittent recovery level 2 test (Yo-Yo IR2). Methods: Thirteen normally trained male subjects carried out four IR2 tests, an incremental treadmill (ITT), various sprint tests. Muscle biopsies blood samples were obtained, heart rate was measured before, during, after test. Additionally, 119 Scandinavian elite soccer players on two to occasions. Results: performance 591 ± 43 (320-920) m or 4.3 (2.6-7.9) min. Test-retest coefficient variation in distance covered 9.6% (N = 29). Heart (HR) at exhaustion 191 3 bpm, 98 1% HRmax. lactate 41.7 5.4 68.5 7.6 mmol·kg−1 d.w. 85 100% time, respectively, with corresponding muscle CP values 40.4 5.2 29.4 4.7 Peak 13.6 0.5 mM. correlated ITT (r 0.74, P < 0.05) V˙O2max 0.56, but not 30- 50-m performance. better (P for international than moderate (1059 35 vs 771 26 m) central defenders 21), fullbacks 20), midfielders 48) goalkeepers 6) attackers 24). Fifteen improved by 42 8% during 8 wk preseasonal training. Conclusion: This study demonstrates that is reproducible can be used evaluate athlete's ability perform intense exercise a high aerobic anaerobic energy turnover. Specifically, shown sensitive tool differentiate between different seasonal periods competitive levels playing positions.