PRE-EXERCISE CARBOHYDRATE ADMINISTRATION: EFFECT OF TIMING ON THE RATE OF GLYCOGEN METABOLISM DURING SUBMAXIMAL RUNNING

Aikaterini Konidari, Prokopios Chatzakis, Elias Zacharogiannis

Abstract


The aim of this study was to investigate the metabolic responses of the timing of preexercise carbohydrate feeding. Nine moderately trained runners, 7 men, and 2 women, performed an incremental test to exhaustion followed by three 6 min running trials at 75% VO2max on the treadmill. The submaximal runs were performed after ingestion a placebo solution (PLA) one hour before or CHO solution 1gr.kgBM-1 one (CHO60) or two hours (CHO120) before the trial. All trials were performed at least 2 days apart in a double-blind cross-over design following an overnight fast. The results showed no significant differences in physiological parameters (VO2, RER, HR) and CHO metabolism between the three conditions. Blood glucose concentration immediately before the 6-min trials was higher after CHO60 (1.22±0.23 gr.L-1) compared to CHO120 (0.93±0.10 gr.L-1) conditions (p=0.007, η2= 0.567). These findings suggest that preexercise timing of CHO ingestion results in significantly different blood glucose concentrations prior to submaximal running, with no further metabolic and physiological alterations.

 

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carbohydrates, physiological parameters, metabolic responses

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References


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DOI: http://dx.doi.org/10.46827/ejpe.v9i4.4644

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