Show simple item record

dc.contributor.authorBradley, Warren J.*
dc.contributor.authorMorehen, James C.*
dc.contributor.authorHaigh, Julian*
dc.contributor.authorClarke, Jon*
dc.contributor.authorDonovan, Timothy F.*
dc.contributor.authorTwist, Craig*
dc.contributor.authorCotton, Caroline*
dc.contributor.authorShepherd, Sam*
dc.contributor.authorCocks, Matthew*
dc.contributor.authorSharma, Asheesh*
dc.contributor.authorImpey, Samuel G.*
dc.contributor.authorMacLaren, Don P. M.*
dc.contributor.authorMorton, James P.*
dc.contributor.authorClose, Graeme L.*
dc.date.accessioned2018-04-25T14:57:24Z
dc.date.available2018-04-25T14:57:24Z
dc.date.issued2016-04-22
dc.identifier.citationBradley, W., et al. (2016). Muscle glycogen utilisation during Rugby match play: Effects of pre-game carbohydrate. Journal of Science and Medicine in Sport, 19(12), 1033-1038. https://doi.org/10.1016/j.jsams.2016.03.008
dc.identifier.issn1440-2440
dc.identifier.doi10.1016/j.jsams.2016.03.008
dc.identifier.urihttp://hdl.handle.net/10034/621103
dc.description.abstractObjectives: Although the physical demands of Rugby League (RL) match-play are well-known, the fuel sources supporting energy-production are poorly understood. We therefore assessed muscle glycogen utilisation and plasma metabolite responses to RL match-play after a relatively high (HCHO) or relatively low CHO (LCHO) diet. Design: Sixteen (mean ± SD age; 18 ± 1 years, body-mass; 88 ± 12 kg, height 180 ± 8 cm) professional players completed a RL match after 36-h consuming a non-isocaloric high carbohydrate (n = 8; 6 g kg day−1) or low carbohydrate (n = 8; 3 g kg day−1) diet. Methods: Muscle biopsies and blood samples were obtained pre- and post-match, alongside external and internal loads quantified using Global Positioning System technology and heart rate, respectively. Data were analysed using effects sizes ±90% CI and magnitude-based inferences. Results: Differences in pre-match muscle glycogen between high and low carbohydrate conditions (449 ± 51 and 444 ± 81 mmol kg−1 d.w.) were unclear. High (243 ± 43 mmol kg−1 d.w.) and low carbohydrate groups (298 ± 130 mmol kg−1 d.w.) were most and very likely reduced post-match, respectively. For both groups, differences in pre-match NEFA and glycerol were unclear, with a most likely increase in NEFA and glycerol post-match. NEFA was likely lower in the high compared with low carbohydrate group post-match (0.95 ± 0.39 mmol l−1 and 1.45 ± 0.51 mmol l−1, respectively), whereas differences between the 2 groups for glycerol were unclear (98.1 ± 33.6 mmol l−1 and 123.1 ± 39.6 mmol l−1) in the high and low carbohydrate groups, respectively. Conclusions: Professional RL players can utilise ∼40% of their muscle glycogen during a competitive match regardless of their carbohydrate consumption in the preceding 36-h.
dc.language.isoenen
dc.publisherElsevier
dc.relation.urlhttps://www.sciencedirect.com/science/article/pii/S1440244016300044en
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectGPSen
dc.subjectNutritionen
dc.subjectMetabolismen
dc.titleMuscle glycogen utilisation during Rugby match play: Effects of pre-game carbohydrateen
dc.typeArticleen
dc.contributor.departmentLiverpool John Moores University; Widnes Vikings Rugby; Glyndwr University; University of Chester; Aintree University Hospital; Royal Liverpool Hospital; University of Liverpool
dc.identifier.journalJournal of Science and Medicine in Sporten
dc.date.accepted2016-03-18
or.grant.openaccessYesen
rioxxterms.funderUnfundeden
rioxxterms.identifier.projectUnfundeden
rioxxterms.versionAMen
rioxxterms.versionofrecordhttps://doi.org/10.1016/j.jsams.2016.03.008
rioxxterms.licenseref.startdate2017-04-22
html.description.abstractObjectives: Although the physical demands of Rugby League (RL) match-play are well-known, the fuel sources supporting energy-production are poorly understood. We therefore assessed muscle glycogen utilisation and plasma metabolite responses to RL match-play after a relatively high (HCHO) or relatively low CHO (LCHO) diet. Design: Sixteen (mean ± SD age; 18 ± 1 years, body-mass; 88 ± 12 kg, height 180 ± 8 cm) professional players completed a RL match after 36-h consuming a non-isocaloric high carbohydrate (n = 8; 6 g kg day−1) or low carbohydrate (n = 8; 3 g kg day−1) diet. Methods: Muscle biopsies and blood samples were obtained pre- and post-match, alongside external and internal loads quantified using Global Positioning System technology and heart rate, respectively. Data were analysed using effects sizes ±90% CI and magnitude-based inferences. Results: Differences in pre-match muscle glycogen between high and low carbohydrate conditions (449 ± 51 and 444 ± 81 mmol kg−1 d.w.) were unclear. High (243 ± 43 mmol kg−1 d.w.) and low carbohydrate groups (298 ± 130 mmol kg−1 d.w.) were most and very likely reduced post-match, respectively. For both groups, differences in pre-match NEFA and glycerol were unclear, with a most likely increase in NEFA and glycerol post-match. NEFA was likely lower in the high compared with low carbohydrate group post-match (0.95 ± 0.39 mmol l−1 and 1.45 ± 0.51 mmol l−1, respectively), whereas differences between the 2 groups for glycerol were unclear (98.1 ± 33.6 mmol l−1 and 123.1 ± 39.6 mmol l−1) in the high and low carbohydrate groups, respectively. Conclusions: Professional RL players can utilise ∼40% of their muscle glycogen during a competitive match regardless of their carbohydrate consumption in the preceding 36-h.


Files in this item

Thumbnail
Name:
Publisher version
Thumbnail
Name:
Bradley et al Muscle glycogen ...
Size:
225.7Kb
Format:
PDF

This item appears in the following Collection(s)

Show simple item record

http://creativecommons.org/licenses/by-nc-nd/4.0/
Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by-nc-nd/4.0/