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COSTAS CHRYSSANTHOPOULOS, Department of Physiology, Medical School, National and Kapodistrian University of Athens, GreeceFollow
EVANGELIA TZERAVINI, First Department of Propaedeutic Medicine, Medical School, Laiko General Hospital, National and Kapodistrian University of Athens, Greece
ELIAS ZACHROGIANNIS, Faculty of Physical Education and Sports Science, National and Kapodistrian University of Athens, Dafni, Greece
MARIA MEGALOU, Biomedicin, Diagnostic and Research Laboratories, Marousi, Greece
ALEXANDER KOKKINOS, First Department of Propaedeutic Medicine, Medical School, Laiko General Hospital, National and Kapodistrian University of Athens, Greece
MARIA MARIDAKI, Faculty of Physical Education and Sports Science, National and Kapodistrian University of Athens, Dafni, Greece
GEORGE DIMITRIADIS, Second Department of Internal Medicine-Research Institute and Diabetes Center, “Attikon” University Hospital, Medical School, National and Kapodistrian University of Athens, Chaidari, Greece
MICHAELLA ALEXANDROU, Department of Physiology, Medical School, National and Kapodistrian University of Athens, Greece
CHRYSOULA KONTRAFOURI, Department of Physiology, Medical School, National and Kapodistrian University of Athens, Greece
DAMIANOS PAPAFILIPPOU, Department of Physiology, Medical School, National and Kapodistrian University of Athens, Greece
ARGYRO POUNTOUKIDOU, Department of Physiology, Medical School, National and Kapodistrian University of Athens, Greece
EFFRAIMIA TSOLAKI, Department of Physiology, Medical School, National and Kapodistrian University of Athens, Greece
MARIA EVANGELIA KOLOUTSOU, Department of Physiology, Medical School, National and Kapodistrian University of Athens, Greece
NIKOLAOS ZACHARODIMOS, Department of Physiology, Medical School, National and Kapodistrian University of Athens, Greece
MICHAEL KOUTSILIERIS, Department of Physiology, Medical School, National and Kapodistrian University of Athens, Greece
ANASTASSIOS PHILIPPOU, Department of Physiology, Medical School, National and Kapodistrian University of Athens, Greece

Abstract

International Journal of Exercise Science 13(2): 1691-1704, 2020. This study examined the phenomenon of transient hypoglycemia and metabolic responses to pre-exercise carbohydrate (CHO) maltodextrin ingestion in cycling and running on the same individuals. Eleven active males cycled or ran for 30 min at 80% maximal heart rate (HRmax) after ingestion of either 1g/kg body mass maltodextrin (CHO-Cycle and CHO-Run respectively) or placebo (PL-Cycle and PL-Run) solutions. Fluids were ingested 30min before exercise in a double-blind and random manner.Blood glucose and serum insulin were higher before exercise in CHO (mean CHO-Cycle+CHO-Run) (Glucose: 7.4 ± 0.3 mmol.l-1; Insulin: 59 ± 10 mU.l-1) compared to placebo (mean PL-Cycle+PL-Run) (Glucose: 4.7 ± 0.1 mmol.l-1; Insulin: 8 ± 1 mU.l-1) (p<0.01), but no differences were observed during exercise among the 4 conditions. Mean blood glucose did not drop below 4.1 mmol.l-1 in any trial. However, six volunteers in CHO-Cycle and seven in CHO-Run experienced blood glucose concentration < 3.5 mmol.l-1 at 20min of exercise and similar degree of transient hypoglycemia in both exercise modes. No association was found between insulin response to maltodextrin ingestion and drop in blood glucose during exercise. Blood lactate increased with exercise more in cycling compared to running, and plasma free fatty acids (FFA) concentrations were higher in placebo compared to CHO irrespective of exercise mode (p<0.01). The ingestion of maltodextrin 30min before exercise at about 80% HRmax produced similar glucose and insulin responses in cycling and running in active males. Lactate was higher in cycling, whereas maltodextrin reduced FFA concentrations independently of exercise mode.

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