The effect of a high carbohydrate meal on endurance running capacity.
This study examined the effects of a pre-exercise meal and a carbohydrate-electrolyte solution on endurance running capacity. Ten men performed 3 treadmill runs at 70% VO2max to exhaustion after consuming (a) a carbohydrate meal 3 h before exercise and a carbohydrate-electrolyte solution during exercise (M + C); or (b) the carbohydrate meal 3 h before exercise and water during exercise (M + W); or (c) a liquid placebo 3 h before exercise and water during exercise (P + W). Exercise time was longer in M + C (125.1 +/- 5.3 min; mean +/- SE) and M + W (111.9 +/- 5.6 min) compared with P + W (102.9 +/- 7.9 min; p < .01 and p < .05, respectively), and longer in M + C compared with M + W (p < .05). Serum insulin concentration at the start of exercise and carbohydrate oxidation rates during the first hour of exercise were higher, whereas plasma FFA concentrations throughout exercise were lower in M + W and M + C than in P + W (p < .01). A carbohydrate meal before exercise at 70% VO2max improved endurance running capacity; however, the combination of the meal and a carbohydrate-electrolyte solution during exercise further improved endurance running capacity.
Department of Physical Education, Sports Science, and Recreation Management, Loughborough University, Loughborough LE11 3TU, UK.
Costas
C
Chryssanthopoulos
Clyde
C
Williams
Andrea
A
Nowitz
Christina
C
Kotsiopoulou
Veronica
V
Vleck
D000328:Adult; D000704:Analysis of Variance; D001786:Blood Glucose / Q000032:analysis; D004040:Dietary Carbohydrates / Q000008:administration & dosage* / Q000378:metabolism; D004573:Electrolytes / Q000008:administration & dosage; D004837:Epinephrine / Q000097:blood; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005990:Glycerol / Q000097:blood; D006801:Humans; D007328:Insulin / Q000097:blood; D019344:Lactic Acid / Q000097:blood; D008297:Male; D010084:Oxidation-Reduction; D010807:Physical Endurance / Q000502:physiology*; D012119:Respiration; D012420:Running / Q000502:physiology*; D013997:Time Factors; D014867:Water / Q000008:administration & dosage
D001786:Blood Glucose; D004040:Dietary Carbohydrates; D004573:Electrolytes; D005230:Fatty Acids, Nonesterified; D007328:Insulin; D014867:Water; D019344:Lactic Acid; D005990:Glycerol; D004837:Epinephrine