Effects of the glycemic index of breakfast on metabolic responses to brisk walking in females

Backhouse, Susan, Williams, Clyde, Stevenson, Emma and Nute, Maria (2007) Effects of the glycemic index of breakfast on metabolic responses to brisk walking in females. European Journal of Clinical Nutrition, 61. pp. 590-596. ISSN 0954-3007

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Official URL: http://dx.doi.org/10.1038/sj.ejcn.1602566

Abstract

Objective: The aim of this study was to examine the metabolic responses during 1 h of brisk walking, 3 h after ingesting high glycemic index (HGI) and moderate glycemic index (MGI) breakfasts. Design and subjects: Six females completed three treadmill walking trials (50% O2 max), separated by at least 1 month. Three hours before walking, they ingested either water or a HGI or MGI breakfast. The MGI breakfast consisted of a mixture of an HGI breakfast cereal and low GI carbohydrate (CHO) foods. The GI values of the HGI and MGI meals were 77 and 51, respectively. Setting: The study took place in the School of Sport and Exercise Sciences at Loughborough University, Loughborough, UK. Results: In the HGI and MGI trials, plasma glucose and serum insulin concentrations peaked 15 min into the postprandial period. At the onset of exercise, plasma insulin concentrations were twofold higher in the HGI (31.57.7 l U l-1) than in the MGI trial (15.21.9 l U l-1) (P<0.05). However, there were no differences in substrate utilization between the two CHO trials. Conclusion: These results suggest that although the addition of LGI CHO foods to an HGI breakfast cereal reduces the overall GI of the meal, the metabolic response to exercise is similar to that following a breakfast comprised entirely of HGI foods.

Item Type: Article
Subjects: B400 Nutrition
Department: Faculties > Health and Life Sciences > School of Life Sciences > Sport, Exercise and Rehabilitation
Depositing User: EPrints Services
Date Deposited: 04 Feb 2010 10:23
Last Modified: 10 Aug 2015 11:48
URI: http://nrl.northumbria.ac.uk/id/eprint/2338

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