Muscle glycogen utilisation during Rugby match play: Effects of pre-game carbohydrate
dc.contributor.author | Bradley, Warren J. | * |
dc.contributor.author | Morehen, James C. | * |
dc.contributor.author | Haigh, Julian | * |
dc.contributor.author | Clarke, Jon | * |
dc.contributor.author | Donovan, Timothy F. | * |
dc.contributor.author | Twist, Craig | * |
dc.contributor.author | Cotton, Caroline | * |
dc.contributor.author | Shepherd, Sam | * |
dc.contributor.author | Cocks, Matthew | * |
dc.contributor.author | Sharma, Asheesh | * |
dc.contributor.author | Impey, Samuel G. | * |
dc.contributor.author | MacLaren, Don P. M. | * |
dc.contributor.author | Morton, James P. | * |
dc.contributor.author | Close, Graeme L. | * |
dc.date.accessioned | 2018-04-25T14:57:24Z | |
dc.date.available | 2018-04-25T14:57:24Z | |
dc.date.issued | 2016-04-22 | |
dc.identifier.citation | Bradley, 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.issn | 1440-2440 | |
dc.identifier.doi | 10.1016/j.jsams.2016.03.008 | |
dc.identifier.uri | http://hdl.handle.net/10034/621103 | |
dc.description.abstract | Objectives: 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.iso | en | en |
dc.publisher | Elsevier | |
dc.relation.url | https://www.sciencedirect.com/science/article/pii/S1440244016300044 | en |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | en |
dc.subject | GPS | en |
dc.subject | Nutrition | en |
dc.subject | Metabolism | en |
dc.title | Muscle glycogen utilisation during Rugby match play: Effects of pre-game carbohydrate | en |
dc.type | Article | en |
dc.contributor.department | Liverpool John Moores University; Widnes Vikings Rugby; Glyndwr University; University of Chester; Aintree University Hospital; Royal Liverpool Hospital; University of Liverpool | |
dc.identifier.journal | Journal of Science and Medicine in Sport | en |
dc.date.accepted | 2016-03-18 | |
or.grant.openaccess | Yes | en |
rioxxterms.funder | Unfunded | en |
rioxxterms.identifier.project | Unfunded | en |
rioxxterms.version | AM | en |
rioxxterms.versionofrecord | https://doi.org/10.1016/j.jsams.2016.03.008 | |
rioxxterms.licenseref.startdate | 2017-04-22 | |
html.description.abstract | Objectives: 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. |