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Improved end-stage high intensity performance but similar glycaemic responses after waxy barley starch ingestion compared to dextrose in type 1 diabetes. / Richard Bracken
Journal of Sports Medicine and Physical Fitness, Volume: 56, Issue: 11, Pages: 1392 - 1400
Swansea University Author: Richard, Bracken
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INTRODUCTION:Pre-exercise carbohydrate (CHO) ingestion is an effective strategy for reducing the occurrence of hypoglycaemia during or after exercise in individuals with type 1 diabetes (T1DM). The metabolic effects of ingestion of different CHOs for glycaemic or performance gains have been under-re...
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INTRODUCTION:Pre-exercise carbohydrate (CHO) ingestion is an effective strategy for reducing the occurrence of hypoglycaemia during or after exercise in individuals with type 1 diabetes (T1DM). The metabolic effects of ingestion of different CHOs for glycaemic or performance gains have been under-researched. This study compared metabolic responses and fuel use during sub-maximal and high-intensity performance running following preexercise 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-1 body mass of DEX or WBS 2-h before a 26-min discontinuous incremental treadmill protocol (4-min running: 1.5-min rest) finishing at 80±4% O2peak followed by a 10-min performance run on a nonmotorised treadmill. Capillary blood samples were taken at rest, during and following exercise and analysed for glucose (BG) and acid-base variables. Data (mean±SEM) were analysed using repeated measures ANOVA (P<0.05).RESULTS:BG reached similar peak values one hour after CHO ingestion and immediate presub- 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 hyperglycaemic 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.
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