Pre-exercise carbohydrate meal and endurance running capacity when carbohydrates are ingested during exercise.
This study examined whether combining a pre-exercise carbohydrate meal with the ingestion of a carbohydrate-electrolyte solution during exercise is better in improving endurance running capacity than a carbohydrate-electrolyte solution alone. Ten men completed three treadmill runs at 70% VO2max to exhaustion. They consumed 1.) a carbohydrate meal three hours before exercise and a carbohydrate-electrolyte solution during exercise (M + C), or 2.) a liquid placebo three hours before exercise and the carbohydrate-electrolyte solution during exercise (P + C), or 3.) a placebo three hours before exercise and placebo during exercise (P + P). When the meal was consumed (M + C) serum insulin concentrations were higher at the start of exercise, and carbohydrate oxidation rates were higher during the first 60 min of exercise compared with the values found in the P + C and P + P trials (p < 0.01). Exercise time was longer in the M + C (147.4+/-9.6 min) compared with the P + C (125.3+/-7 min) (p < 0.01). Also, exercise time was longer in M + C and P + C compared with the P + P (115.1+/-7.6 min) (p < 0.01 and p < 0.05 respectively). These results indicate that the combination of a pre-exercise carbohydrate meal and a carbohydrate-electrolyte solution further improves endurance running capacity than the carbohydrate-electrolyte solution alone.
Chryssanthopoulos
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Department of Physical Education, Sports Science and Recreation Management, Loughborough University, England, UK.
Williams
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D000328:Adult; D000704:Analysis of Variance; D001786:Blood Glucose / Q000032:analysis; D004040:Dietary Carbohydrates / Q000008:administration & dosage* / Q000378:metabolism; D004435:Eating / Q000502:physiology; D004573:Electrolytes / Q000008:administration & dosage; D005080:Exercise Test; D017079:Exercise Tolerance; D005230:Fatty Acids, Nonesterified / Q000097:blood; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D007328:Insulin / Q000097:blood; D007773:Lactates / Q000097:blood; D008297:Male; D009752:Nutritional Status; D010084:Oxidation-Reduction; D010101:Oxygen Consumption / Q000502:physiology; D010807:Physical Endurance / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology; D010919:Placebos; D012119:Respiration / Q000502:physiology; D012420:Running / Q000502:physiology*; D012996:Solutions; D013997:Time Factors
D001786:Blood Glucose; D004040:Dietary Carbohydrates; D004573:Electrolytes; D005230:Fatty Acids, Nonesterified; D007328:Insulin; D007773:Lactates; D010919:Placebos; D012996:Solutions