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The Yo-Yo IE2 Test: Physiological Response for Untrained Men versus Trained Soccer Players

Krustrup, P. (författare)
Bradley, P. S. (författare)
Christensen, J. F. (författare)
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Castagna, C. (författare)
Jackman, S. (författare)
Connolly, L. (författare)
Randers, M. B. (författare)
Mohr, Magni, 1973 (författare)
Gothenburg University,Göteborgs universitet,Institutionen för kost- och idrottsvetenskap,Department of Food and Nutrition, and Sport Science
Bangsbo, J. (författare)
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 (creator_code:org_t)
Ovid Technologies (Wolters Kluwer Health), 2015
2015
Engelska.
Ingår i: Medicine and Science in Sports and Exercise. - : Ovid Technologies (Wolters Kluwer Health). - 0195-9131. ; 47:1, s. 100-108
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • 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.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Hälsovetenskap -- Idrottsvetenskap (hsv//swe)
MEDICAL AND HEALTH SCIENCES  -- Health Sciences -- Sport and Fitness Sciences (hsv//eng)

Nyckelord

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

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