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Effects of carbohydrate dose and frequency on metabolism, gastrointestinal discomfort, and cross-countryskiing performance
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences. Human Physiology Research Group Department for Health University of Bath, Bath, UK. (Swedish Winter Sports Research Centre)
Human Physiology Research Group Department for Health University of Bath, Bath, UK.
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences. (Swedish Winter Sports Research Centre)
2016 (English)In: Scandinavian Journal of Medicine and Science in Sports, ISSN 0905-7188, E-ISSN 1600-0838, Vol. 26, no 9, 1100-1108 p.Article in journal (Refereed) Published
Abstract [en]

This study investigated carbohydrate ingestion of varied doses and frequencies during a simulated cross-country skiing time trial. Ten men and three women (age: 30±7years; VO2max: 59.6±5.7 mL/kg/min) completed four, 30-km classic technique roller skiing time trials on a treadmill. A 1:1 maltodextrin-fructose carbohydrate solution was provided at high (2.4 g/min; HC) and moderate (1.2 g/min; MC) ingestion rates, each at high (six feeds;HF) and low (two feeds; LF) frequencies. In the LF trials, blood glucose was elevated following carbohydrate ingestion (at 4 and 19 km) but was reduced at 14 and 29 km compared with HF strategies (P≤0.05). Gastrointestinal discomfort was higher in HC-LF compared with all other trials (P≤0.05). Whole-body lipid oxidation was lowerand carbohydrate oxidation was higher in LF compared with HF trials (P≤0.05). While performance time was not significantly different between trials (140:11±15:31,140:43±17:40, 139:12±15:32 and 140:33±17:46 min:sin HC-HF, HC-LF, MC-HF, and MC-LF, respectively;P>0.05), it was improved with trial order (P<0.001). There was no effect of order on any other variable (P>0.05). Altering carbohydrate dose or frequency does not affect cross-country ski performance. However, low-frequency carbohydrate ingestion resulted in poorer maintenance of euglycemia, reduced lipid oxidation, and increased gastrointestinal discomfort.

Place, publisher, year, edition, pages
2016. Vol. 26, no 9, 1100-1108 p.
Keyword [en]
Endurance performance, Glucose, Multiple-transportable carbohydrate, Nordic skiing, Roller skiing
National Category
Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:miun:diva-25881DOI: 10.1111/sms.12544ISI: 000382714500013Scopus ID: 2-s2.0-84981554576OAI: oai:DiVA.org:miun-25881DiVA: diva2:854857
Note

Published online 27th Aug 2015.

Available from: 2015-09-18 Created: 2015-09-18 Last updated: 2016-10-07Bibliographically approved

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CiteExportLink to record
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Citation style
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