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Muscle Glycogen Utilisation during an Australian Rules Football Game.

Routledge, HE, Leckey, JJ, Lee, MJ, Garnham, A, Graham, S, Burgess, D, Burke, LM, Erskine, RM, Close, GL and Morton, JP (2018) Muscle Glycogen Utilisation during an Australian Rules Football Game. International Journal of Sports Physiology and Performance. ISSN 1555-0273

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Routledge et al. 2018 - Muscle Glycogen Utlisation in Australian Rules Football.pdf - Accepted Version

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Abstract

PURPOSE: To better understand the carbohydrate (CHO) requirement of Australian Football (AF) match play by quantifying muscle glycogen utilisation during an in-season AF match. METHODS: After a 24 h CHO loading protocol of 8 g/kg and 2 g/kg in the pre-match meal, two elite male forward players had biopsies sampled from m. vastus lateralis before and after participation in a South Australian Football League game. Player A (87.2kg) consumed water only during match play whereas player B (87.6kg) consumed 88 g CHO via CHO gels. External load was quantified using global positioning system technology. RESULTS: Player A completed more minutes on the ground (115 vs. 98 min) and covered greater total distance (12.2 vs. 11.2 km) than Player B, though with similar high-speed running (837 vs. 1070 m) and sprinting (135 vs. 138 m), respectively. Muscle glycogen decreased by 66% in Player A (Pre-: 656, Post-: 223 mmol∙kg-1 dw) and 24% in Player B (Pre-: 544, Post-: 416 mmol∙kg-1 dw), respectively. CONCLUSION: Pre-match CHO loading elevated muscle glycogen concentrations (i.e. >500 mmol.kg-1 dw), the magnitude of which appears sufficient to meet the metabolic demands of elite AF match play. The glycogen cost of AF match play may be greater than soccer and rugby and CHO feeding may also spare muscle glycogen use. Further studies using larger sample sizes are now required to quantify the inter-individual variability of glycogen cost of match play (including muscle and fibre-type specific responses) as well examine potential metabolic and ergogenic effects of CHO feeding.

Item Type: Article
Additional Information: Accepted author manuscript version reprinted, by permission, from International Journal of Sports Physiology and Performance, 2018, https://doi.org/10.1123/ijspp.2018-0106. © Human Kinetics, Inc.
Uncontrolled Keywords: 1106 Human Movement And Sports Science
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: Human Kinetics
Related URLs:
Date Deposited: 28 Sep 2018 11:48
Last Modified: 28 Sep 2018 11:52
DOI or Identification number: 10.1123/ijspp.2018-0106
URI: http://researchonline.ljmu.ac.uk/id/eprint/9369

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