The Yo-Yo IE2 test: Physiological response for untrained men versus trained soccer players

Peter Krustrup, Paul S Bradley, Jesper F Christensen, Carlo Castagna, Sarah Jackman, Luke J Connolly, Morten B Randers, Magni Mohr, Jens Bangsbo

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Abstrakt

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 VO 2max (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% HR max 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 mmol·kg 1 d.w·min -1), muscle lactate accumulation (16.8 ± 9.1 vs 4.2 ± 2.9 mmol·kg -1 d.w.·min -1), and glycogen breakdown (29.6 ± 14.2 vs 7.7 ± 5.4 mmol·kg -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 VO 2max (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, VO 2max seemed to be important for intermittent exercise performance in UTR but not for TR.

OriginalsprogEngelsk
TidsskriftMedicine and Science in Sports and Exercise
Vol/bind47
Udgave nummer1
Sider (fra-til)100-108
ISSN0195-9131
DOI
StatusUdgivet - 1. jan. 2015

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