Muscle Metabolism and Fatigue during Simulated Ice Hockey Match-play in Elite Players

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  • Jeppe Foged Vigh-Larsen
  • Georgios Ermidis, Syddansk Universitet, University of Naples Parthenope
  • ,
  • Vincenzo Rago, Universidade Europeia, Lisbon, Portugal Football School, Portugal
  • Morten Bredsgaard Randers, Syddansk Universitet, UiT The Arctic University of Norway
  • ,
  • Dan Fransson, University of Gothenburg, Sverige
  • Jakob L. Nielsen, Syddansk Universitet
  • ,
  • Lasse Gliemann, Københavns Universitet
  • ,
  • Jacob Feder Piil, Københavns Universitet
  • ,
  • Nathan Bradley Morris, Københavns Universitet
  • ,
  • Frank Vincenzo de Paoli
  • Kristian Overgaard
  • T. Bull Andersen
  • Lars Nybo, Københavns Universitet, Danmark
  • Peter Krustrup, Syddansk Universitet, University of Exeter, Shanghai University of Sport
  • ,
  • Magni Mohr, Syddansk Universitet, University of the Faroe Islands
Purpose The present study investigated muscle metabolism and fatigue during simulated elite male ice hockey match-play. Methods Thirty U20 male national team players completed an experimental game comprising three periods of 8x1-min shifts separated by 2-min recovery intervals. Two vastus lateralis biopsies were obtained either during the game (n=7) or pre- and post-game (n=6). Venous blood samples were drawn pre-game and at the end of the first and last period (n=14). Activity pattern and physiological responses were continuously monitored using local positioning system and heart rate recordings. Further, repeated-sprint ability was tested pre-game and after each period. Results Total distance covered was 5980±199 m with almost half the distance covered at high skating speeds (>17 km·h-1). Average and peak on-ice heart rate was 84±2 and 97±2% of maximum heart rate, respectively. Muscle lactate increased (P≤0.05) more than 5- and 3-fold, while muscle pH decreased (P≤0.05) from 7.31±0.04 pre-game to 6.99±0.07 and 7.13±0.11 during the first and last period, respectively. Muscle glycogen decreased by 53% post-game (P≤0.05) with ~65% of fast- and slow-twitch fibers depleted of glycogen. Blood lactate increased 6-fold (P≤0.05), while plasma free fatty acid levels increased 1.5- and 3-fold (P≤0.05) after the first and last period. Repeated-sprint ability was impaired (~3%; P≤0.05) post-game concomitant with a ~10% decrease in the number of accelerations and decelerations during the second and last period (P≤0.05). Conclusion Our findings demonstrate that a simulated ice hockey match-play scenario encompasses a high on-ice heart rate response and glycolytic loading resulting in a marked degradation of muscle glycogen, particularly in specific sub-groups of fibers. This may be of importance both for fatigue in the final stages of a game and for subsequent recovery.
OriginalsprogEngelsk
TidsskriftMedicine and Science in Sports and Exercise
Vol/bind52
Nummer10
Sider (fra-til)2162-2171
ISSN0195-9131
DOI
StatusUdgivet - okt. 2020

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