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The effect of high versus low concentration maltodextrin-fructose ingestion during a simulated 30-km cross-country ski race
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences. (Swedish Winter Sports Research Centre)
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
2014 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

Introduction

Long-distance cross-country ski races typically last more than 2 h, depleting muscle glycogen stores in the legs and, to an even greater extent, the arms (Bergström et al. 1973). While carbohydrate (CHO) supplementation demonstrates clear performance-enhancing effects, particularly when ingested during exercise lasting > 1 h and in multiple forms (Jeukendrup 2004), there is limited information regarding the use of CHO during cross-country skiing. Therefore, the aim of the current study was to examine the effect of ingesting two different CHO solutions on 30-km cross-country skiing performance.

Methods

10 male and 3 female trained cross-country skiers (age: 30±7 yr; body mass: 74±9 kg; VO2max: 60±6 mL/kg/min) completed 4 x 30-km classic roller-skiing time-trial efforts (consisting of 6 x 5-km loops) on separate days in a randomised, counter-balanced order on a treadmill. Two trials used a high rate of CHO ingestion (2.4 g/min, HC) and two trials used a lower rate of CHO ingestion (1.2 g/min, LC). In addition, two trials used a high frequency of CHO feeds (6 feeds, HF) and two trials used a low frequency of CHO feeds (2 feeds, LF). The CHO was a 1:1 mix of maltodextrin and fructose and the drinks were provided at 24% and 12% concentrations for HC and LC, respectively.

Results

There were no significant differences in performance over the four trials (140±16, 139±16, 141±18 and 141±18 min for HC-HF, LC-HF, HC-LF and LC-LF, respectively) and when matched for frequency of feeds, there were no significant performance differences between the paired comparisons (i.e., HC-HF vs LC-HF and HC-LF vs LC-LF). Moreover, there were no significant differences in blood glucose concentrations at 5-km intervals when comparing HC-HF with LC-HF (p>0.05) or HC-LF with LC-LF (p>0.05). However, an order effect was detected for performance (143±17, 140±16, 140±17 and 138±15 min for trials 1-4, respectively) with significant improvements from trials 1-2 (p=0.02) and 3-4 (p=0.03).

Discussion

Results from the current study demonstrate no significant differences in 30-km cross-country ski performance when consuming either 2.4 or 1.2 g/min of a mixed CHO solution. Furthermore, there were no significant differences in blood glucose concentrations during exercise between the high and lower CHO trials. However, despite familiarisation to treadmill roller-skiing and the simulated race track, a learning effect was evident. It is concluded that race-track familiarity may have a greater effect on 30-km cross-country ski performance than the rate of CHO ingestion.

Place, publisher, year, edition, pages
2014.
National Category
Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:miun:diva-25882OAI: oai:DiVA.org:miun-25882DiVA, id: diva2:854859
Conference
19th Annual Congress of the European College of Sport Science
Available from: 2015-09-18 Created: 2015-09-18 Last updated: 2015-10-13Bibliographically approved

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McGawley, KerryStocks, Ben

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CiteExportLink to record
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Citation style
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