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

Authors

  • Aikaterini Konidari Graduate Student, School of Physical Education and Sport Science, National and Kapodistrian University of Athens, Athens, ATT, Greece
  • Prokopios Chatzakis Graduate Student, School of Physical Education and Sport Science, National and Kapodistrian University of Athens, Athens, ATT, Greece
  • Elias Zacharogiannis Professor, School of Physical Education and Sport Science, National and Kapodistrian University of Athens, Athens, ATT, Greece

DOI:

https://doi.org/10.46827/ejpe.v9i4.4644

Keywords:

carbohydrates, physiological parameters, metabolic responses

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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Author Biographies

  • Aikaterini Konidari, Graduate Student, School of Physical Education and Sport Science, National and Kapodistrian University of Athens, Athens, ATT, Greece

    Aikaterini Konidari graduated from the School of Physical Education and Sport Science, National and Kapodistrian University of Athens, Greece. Her research interests include track and field and applied exercise physiology.

  • Prokopios Chatzakis, Graduate Student, School of Physical Education and Sport Science, National and Kapodistrian University of Athens, Athens, ATT, Greece

    track and field and applied exercise physiology.

    Prokopios Chatzakis is a PhD Student at the School of Physical Education and Sport Science, National and Kapodistrian University of Athens, Greece.

  • Elias Zacharogiannis, Professor, School of Physical Education and Sport Science, National and Kapodistrian University of Athens, Athens, ATT, Greece

    Elias Zacharogiannis is an associate professor in Track and Field Sector at the School of Physical Education and Sport Science, National and Kapodistrian University of Athens< Greece.

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Published

2023-01-20

Issue

Vol. 9 No. 4 (2023)

Section

Articles

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