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Metabolic demands and replenishment of muscle glycogen after a rugby league match simulation protocol.

Bradley, WJ, Hannon, MP, Benford, V, Morehen, JC, Twist, C, Shepherd, SO, Cocks, MS, Impey, SG, Cooper, RG, Morton, JP and Close, GL (2017) Metabolic demands and replenishment of muscle glycogen after a rugby league match simulation protocol. Journal of Science and Medicine in Sport. ISSN 1878-1861

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OBJECTIVES: The metabolic requirements of a rugby league match simulation protocol and the timing of carbohydrate provision on glycogen re-synthesis in damaged muscle were examined. DESIGN: Fifteen (mean±SD: age 20.9±2.9 year, body-mass 87.3±14.1kg, height 177.4±6.0cm) rugby league (RL) players consumed a 6gkgday-1 CHO diet for 7-days, completed a time to exhaustion test (TTE) and a glycogen depletion protocol on day-3, a RL simulated-match protocol (RLMSP) on day-5 and a TTE on day-7. Players were prescribed an immediate or delayed (2-h-post) re-feed post-simulation. METHODS: Muscle biopsies and blood samples were obtained post-depletion, before and after simulated match-play, and 48-h after match-play with PlayerLoad and heart-rate collected throughout the simulation. Data were analysed using effects sizes±90% CI and magnitude-based inferences. RESULTS: PlayerLoad (8.0±0.7 AUmin-1) and %HRpeak (83±4.9%) during the simulation were similar to values reported for RL match-play. Muscle glycogen very likely increased from immediately after to 48-h post-simulation (272±97 cf. 416±162mmolkg-1d.w.; ES±90%CI) after immediate re-feed, but changes were unclear (283±68 cf. 361±144mmolkg-1d.w.; ES±90%CI) after delayed re-feed. CK almost certainly increased by 77.9±25.4% (0.75±0.19) post-simulation for all players. CONCLUSIONS: The RLMSP presents a replication of the internal loads associated with professional RL match-play, although difficulties in replicating the collision reduced the metabolic demands and glycogen utilisation. Further, it is possible to replete muscle glycogen in damaged muscle employing an immediate re-feed strategy.

Item Type: Article
Uncontrolled Keywords: 1106 Human Movement And Sports Science, 1117 Public Health And Health Services
Subjects: T Technology > TX Home economics > TX341 Nutrition. Foods and food supply
Q Science > QP Physiology
R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: Elsevier
Related URLs:
Date Deposited: 20 Jun 2017 08:26
Last Modified: 04 Sep 2021 11:28
DOI or ID number: 10.1016/j.jsams.2017.02.005
URI: https://researchonline.ljmu.ac.uk/id/eprint/6612
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