Pre-exercise carbohydrate meal and endurance running capacity when carbohydrates are ingested during exercise

Area of Science:

• Exercise Physiology
• Sports Nutrition

Background:

• Optimizing fuel availability is crucial for endurance performance.
• The synergistic effects of pre-exercise carbohydrate intake and intra-exercise carbohydrate-electrolyte solutions require further investigation.

Purpose of the Study:

• To determine if a pre-exercise carbohydrate meal combined with intra-exercise carbohydrate-electrolyte solution ingestion improves endurance running capacity more than carbohydrate-electrolyte solution alone.

Main Methods:

• Ten male participants completed three treadmill running trials to exhaustion at 70% VO2max.
• Interventions included: 1) carbohydrate meal + carbohydrate-electrolyte solution (M+C), 2) placebo + carbohydrate-electrolyte solution (P+C), 3) placebo + placebo (P+P).

Main Results:

• The M+C trial showed higher insulin concentrations and carbohydrate oxidation rates during the initial 60 minutes of exercise.
• Exercise duration was significantly longer in the M+C group (147.4 min) compared to P+C (125.3 min) and P+P (115.1 min).
• Both M+C and P+C trials resulted in significantly longer exercise times than the P+P trial.

Conclusions:

• Combining a pre-exercise carbohydrate meal with intra-exercise carbohydrate-electrolyte solution ingestion offers superior benefits for endurance running capacity.
• This nutritional strategy enhances substrate utilization and prolongs exercise duration in endurance athletes.