Gray, BJ, Page, R, Turner, D et al. (6 more authors) (2016) Improved end-stage high-intensity performance but similar glycemic responses after waxy barley starch ingestion compared to dextrose in type 1 diabetes. Journal of Sports Medicine and Physical Fitness, 56 (11). pp. 1392-1400. ISSN 0022-4707
Abstract
BACKGROUND: Pre-exercise carbohydrate (CHO) ingestion is an effective strategy for reducing the occurrence of hypoglycemia during or after exercise in individuals with type 1 diabetes (T1DM). The metabolic effects of ingestion of different CHOs for glycemic or performance gains have been under-researched. This study compared metabolic responses and fuel use during sub-maximal and high-intensity performance running following pre-exercise ingestion of waxy barley starch (WBS) or dextrose (DEX) in T1DM.
METHODS: Seven participants attended the laboratory on two separate occasions following preliminary testing. On each visit participants consumed either 0.6 g/kg body mass of DEX or WBS 2 hours before a 26-minute discontinuous incremental treadmill protocol (4-minute running: 1.5-min rest) finishing at 80±4% V̇O2peak followed by a 10-min performance run on a non-motorized treadmill. Capillary blood samples were taken at rest, during and following exercise and analyzed for glucose (BG) and acid-base variables. Data (mean ± SEM) were analyzed using repeated measures ANOVA (P<0.05).
RESULTS: BG reached similar peak values one hour after CHO ingestion and immediate pre-sub-maximal exercise BG were comparable. Resting CHO oxidation was elevated and lipid oxidation lower under WBS (P<0.05). There were no metabolic or cardio-respiratory differences during the sub-maximal exercise (P>0.05). In the final quartile of the performance run, a greater distance was completed under WBS (WBS 323±21 vs. DEX 301±20 m, P=0.02).
CONCLUSIONS: Consumption of WBS demonstrated similar hyperglycemic responses to dextrose ingestion but a greater rate of CHO use at rest. Interestingly, T1DM individuals displayed an improved performance at the latter stages of a high-intensity run test.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Keywords: | Blood glucose; Carbohydrates; Molecular weight; Athletic performance |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Food Science and Nutrition (Leeds) > FSN Nutrition and Public Health (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 22 Jan 2019 16:04 |
Last Modified: | 04 Jul 2019 15:14 |
Status: | Published |
Publisher: | Edizioni Minerva Medica |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:138351 |