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. 2020 Oct;52(10):2162-2171.
doi: 10.1249/MSS.0000000000002370.

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

Jeppe F Vigh-Larsen  1 , Georgios Ermidis, Vincenzo Rago, Morten B Randers, Dan Fransson  2 , Jakob L Nielsen  3 , Lasse Gliemann  4 , Jacob F Piil  4 , Nathan B Morris  4 , Frank V DE Paoli  5 , Kristian Overgaard  1 , Thomas B Andersen  1 , Lars Nybo  4 , Peter Krustrup, Magni Mohr
Affiliations

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

Jeppe F Vigh-Larsen et al. Med Sci Sports Exerc. 2020 Oct.

Abstract

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 8 × 1-min shifts separated by 2-min recovery intervals. Two vastus lateralis biopsies were obtained either during the game (n = 7) or pregame and postgame (n = 6). Venous blood samples were drawn pregame and at the end of the first and last periods (n = 14). Activity pattern and physiological responses were continuously monitored using local positioning system and heart rate recordings. Further, repeated-sprint ability was tested pregame 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). 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 fivefold and threefold, whereas muscle pH decreased (P ≤ 0.05) from 7.31 ± 0.04 pregame to 6.99 ± 0.07 and 7.13 ± 0.11 during the first and last periods, respectively. Muscle glycogen decreased by 53% postgame (P ≤ 0.05) with ~65% of fast- and slow-twitch fibers depleted of glycogen. Blood lactate increased sixfold (P ≤ 0.05), whereas plasma free fatty acid levels increased 1.5-fold and threefold (P ≤ 0.05) after the first and last periods. Repeated-sprint ability was impaired (~3%; P ≤ 0.05) postgame concomitant with a ~10% decrease in the number of accelerations and decelerations during the second and last periods (P ≤ 0.05).

Conclusions: 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.

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