The influence of dietary carbohydrate on performance of supramaximal intermittent exercise

Jenkins, D.G., Palmer, J. and Spillman, D. (1993) The influence of dietary carbohydrate on performance of supramaximal intermittent exercise. European Journal of Applied Physiology and Occupational Physiology, 67 4: 309-314. doi:10.1007/BF00357628


Author Jenkins, D.G.
Palmer, J.
Spillman, D.
Title The influence of dietary carbohydrate on performance of supramaximal intermittent exercise
Journal name European Journal of Applied Physiology and Occupational Physiology   Check publisher's open access policy
ISSN 0301-5548
Publication date 1993-10-01
Sub-type Article (original research)
DOI 10.1007/BF00357628
Open Access Status Not Open Access
Volume 67
Issue 4
Start page 309
End page 314
Total pages 6
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Formatted abstract
The present investigation examined the influence of dietary carbohydrate (CHO) on the performance of supramaximal intermittent exercise. A group of 14 moderately trained male students [mean age 21.0 (SD 1.6) years] completed a maximal oxygen consumption test and two identical 'maximal interval tests' (MIT 1 and MIT 2) over a 10-day experimental period. Each MIT involved five 60-s all-out periods of cycling (against 0.736 N.kg -1 body mass), with each period separated by 5 min of passive recovery. All subjects consumed a moderate CHO diet for 3 days preceding MIT 1 (55.3% of energy intake as CHO) and were then randomly assigned to either a high CHO (83%), moderate CHO (58%) or low CHO (12%) diet for the 3 days separating MIT 1 and MIT 2. All food and drink consumed during the experimental period was weighed and recorded for later dietary analysis. Measurements of work done, exercise oxygen consumption (VO 2), venous blood pH, plasma lactate and plasma glucose concentrations were compared between interval tests. Independent Student's t-tests revealed that the 5.6% increase in total work done recorded by the high CHO group and the 2.3% increase by the moderate CHO group between MIT 1 and MIT 2, were significantly different to the 5.4% decrease in performance recorded for the low CHO group (P < 0.001 and P < 0.01, respectively). No significant differences in performance changes was found between the high and moderate CHO groups; 10 subjects in each of these groups would have been necessary to attain significance at the 0.05 level using the same procedures. No changes in VO 2, venous blood pH, plasma lactate or glucose concentrations were found among the groups. These data showed that when compared to a low CHO diet, a moderate/high intake of dietary CHO could at least maintain the performance of supramaximal intermittent exercise. The results emphasise the importance of dietary CHO for athletes whose activities involve repeated periods of very high intensity exercise.
Keyword Supramaximal exercise
Dietary carbohydrate
Muscle
Metabolism
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Human Movement and Nutrition Sciences Publications
 
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Created: Wed, 09 Mar 2011, 18:50:08 EST