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

Bradley, WJ and Hannon, MP and Benford, V and Morehen, JC and Twist, C and Shepherd, SO and Cocks, MS and Impey, SG and Cooper, RG and 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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Abstract

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: 06 Sep 2017 14:46
DOI or Identification number: 10.1016/j.jsams.2017.02.005
URI: http://researchonline.ljmu.ac.uk/id/eprint/6612

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