The Yo-Yo IR2 test: physiological response, reliability, and application to elite soccer

• Published in: Medicine and science in sports and exercise Vol. 38; no. 9; p. 1666
• Main Authors: Krustrup, Peter, Mohr, Magni, Nybo, Lars, Jensen, Jack Majgaard, Nielsen, Jens Jung, Bangsbo, Jens
• Format: Journal Article
• Language: English
• Published: United States 01.09.2006
• Subjects: Adult; Exercise Test - methods; Fatigue; Heart Rate - physiology; Humans; Lactic Acid - blood; Male; Phosphocreatine - analysis; Physical Endurance - physiology; Physical Fitness; Reproducibility of Results; Soccer - physiology

To examine the physiological response, reliability, and validity of the Yo-Yo intermittent recovery level 2 test (Yo-Yo IR2). Thirteen normally trained male subjects carried out four Yo-Yo IR2 tests, an incremental treadmill test (ITT), and various sprint tests. Muscle biopsies and blood samples wer...