Document Detail

Effects of the glycemic index of breakfast on metabolic responses to brisk walking in females.
MedLine Citation:
PMID:  17136034     Owner:  NLM     Status:  MEDLINE    
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 (approximately 50% VO2 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 (31.5+/-7.7 microl U l(-1)) than in the MGI trial (15.2+/-1.9 microl 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.
S H Backhouse; C Williams; E Stevenson; M Nute
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial     Date:  2006-11-29
Journal Detail:
Title:  European journal of clinical nutrition     Volume:  61     ISSN:  0954-3007     ISO Abbreviation:  Eur J Clin Nutr     Publication Date:  2007 May 
Date Detail:
Created Date:  2007-05-02     Completed Date:  2007-06-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8804070     Medline TA:  Eur J Clin Nutr     Country:  England    
Other Details:
Languages:  eng     Pagination:  590-6     Citation Subset:  IM    
Carnegie Research Institute, Leeds Metropolitan University, Leeds, UK.
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MeSH Terms
Area Under Curve
Blood Glucose / metabolism*
Cross-Over Studies
Dietary Carbohydrates / administration & dosage,  classification,  metabolism*
Glycemic Index*
Insulin / blood*
Oxygen Consumption
Postprandial Period / physiology
Walking / physiology*
Reg. No./Substance:
0/Blood Glucose; 0/Dietary Carbohydrates; 11061-68-0/Insulin

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