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- Vigh-Larsen, J. F., et al.
(author)
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Muscle Metabolism and Fatigue during Simulated Ice Hockey Match-Play in Elite Players
- 2020
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In: Medicine and science in sports and exercise. - : Ovid Technologies (Wolters Kluwer Health). - 0195-9131 .- 1530-0315. ; 52:10, s. 2162-2171
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Journal article (peer-reviewed)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 x 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(-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 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 similar to 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 (similar to 3%;P <= 0.05) postgame concomitant with a similar to 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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