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The Yo-Yo IE2 Test:...
The Yo-Yo IE2 Test: Physiological Response for Untrained Men versus Trained Soccer Players
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Krustrup, P. (author)
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Bradley, P. S. (author)
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Christensen, J. F. (author)
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Castagna, C. (author)
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Jackman, S. (author)
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Connolly, L. (author)
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Randers, M. B. (author)
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- Mohr, Magni, 1973 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kost- och idrottsvetenskap,Department of Food and Nutrition, and Sport Science
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Bangsbo, J. (author)
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(creator_code:org_t)
- Ovid Technologies (Wolters Kluwer Health), 2015
- 2015
- English.
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In: Medicine and Science in Sports and Exercise. - : Ovid Technologies (Wolters Kluwer Health). - 0195-9131. ; 47:1, s. 100-108
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Abstract
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- Purpose This study aimed to examine the physical capacity and physiological response to the Yo-Yo Intermittent Endurance level 2 test (IE2) for untrained individuals (UTR) and trained male soccer players (TR) and to investigate the determinants of intense intermittent exercise performance. Methods Thirty-four healthy UTR males and 15 age-matched TR performed a maximal incremental treadmill test and a Yo-Yo IE2 test. Muscle biopsies and blood samples were obtained, and heart rate (HR) was measured before, during, and after tests. Results UTR had a 67% lower (P < 0.01) Yo-Yo IE2 performance (665 271 vs 2027 +/- 298 m; effect size (ES), 4.8), 34% lower VO2max (P < 0.01), and 19% lower resting muscle glycogen (P < 0.05) than those of TR. Blood lactate concentration and HR during the first 560 m of the Yo-Yo IE2 test were higher (P < 0.01) in UTR than those in TR (560 m, 7.4 +/- 2.8 vs 2.4 +/- 0.8 mM; ES, 1.7-2.8; 188 +/- 11 vs 173 +/- 8 bpm; ES, 0.9-1.5), with no differences at exhaustion. Time >95% HRmax was lower (P < 0.01) in UTR than that in TR (1.0 +/- 1.1 vs 6.3 +/- 2.9 min; ES, 3.1). Mean rates of muscle creatine phosphate utilization (16.5 +/- 9.5 vs 4.3 +/- 2.7 mmolkg(-1) d.wmin(-1)), muscle lactate accumulation (16.8 +/- 9.1 vs 4.2 +/- 2.9 mmolkg(-1) d.w.min(-1)), and glycogen breakdown (29.6 +/- 14.2 vs 7.7 +/- 5.4 mmolkg(-1) d.w.min(-1)) were fourfold higher (P < 0.01; ES, 1.4-1.7) in UTR than those in TR. For UTR, correlations (P < 0.01) were observed between Yo-Yo IE2 performance and VO2max (r = 0.77), incremental treadmill test performance (r = 0.79), and muscle citrate synthase activity (r = 0.57) but not for TR (r = -0.12 to 0.50; P > 0.05). Conclusions The Yo-Yo IE2 test was shown to possess high construct validity by showing large differences in performance, HR, and anaerobic metabolism between UTR and TR. In addition, VO2max seemed to be important for intermittent exercise performance in UTR but not for TR.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Hälsovetenskap -- Idrottsvetenskap (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Health Sciences -- Sport and Fitness Sciences (hsv//eng)
Keyword
- MUSCLE LACTATE
- BLOOD LACTATE
- HEART RATE
- VO2MAX
- INTENSE INTERMITTENT EXERCISE
- INTERMITTENT RECOVERY TEST
- HUMAN SKELETAL-MUSCLE
- ELITE FEMALE SOCCER
- EXERCISE PERFORMANCE
- PHYSICAL PERFORMANCE
- BLOOD-SAMPLES
- FATIGUE
- FOOTBALL
- VALIDITY
- DEMANDS
- Sport Sciences
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Krustrup, P.
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Bradley, P. S.
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Christensen, J. ...
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Castagna, C.
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Jackman, S.
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Connolly, L.
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show more...
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Randers, M. B.
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Mohr, Magni, 197 ...
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Bangsbo, J.
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show less...
- About the subject
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- MEDICAL AND HEALTH SCIENCES
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MEDICAL AND HEAL ...
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and Health Sciences
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and Sport and Fitnes ...
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Medicine and Sci ...
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University of Gothenburg