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Carbohydrate Ingestion during Prolonged Cycling Improves Next-Day Time Trial Performance and Alters Amino Acid
Matthieu Clauss1, Øyvind Skattebo1, Malin Rasen Dæhli1
1Department of Physical Performance, Norwegian School of Sport Sciences, Oslo, NORWAY.
Medicine and Science in Sports and Exercise
|August 3, 2023
Summary
Consuming carbohydrates during intense exercise improves next-day athletic performance and reduces fatigue. This strategy helps maintain energy levels and may decrease muscle protein breakdown for better recovery.
Area of Science:
- Sports Science
- Exercise Physiology
- Nutritional Biochemistry
Background:
- Low carbohydrate availability during exercise can increase protein degradation, potentially impairing subsequent performance.
- Understanding the impact of carbohydrate intake on metabolic stress and recovery is crucial for athletes.
Purpose of the Study:
- To investigate the effect of carbohydrate ingestion during standardized exhaustive exercise on protein degradation.
- To assess the impact of carbohydrate availability on next-day athletic performance in trained cyclists.
Main Methods:
- Seven trained male cyclists performed two exercise sessions to exhaustion: one with a placebo (PLA) and one with carbohydrate ingestion (CHO).
- Exercise involved cycling at 68% V̇O2max followed by high-intensity intervals at 90% V̇O2max.
- Next-day performance was evaluated using a time trial (TT), with urinary nitrogen and specific amino acid levels monitored.
Main Results:
- Carbohydrate ingestion maintained plasma glucose levels and increased total carbohydrate oxidation during exercise.
- Next-day time trial performance was significantly better after carbohydrate ingestion (41:49 min vs. 42:50 min).
- Plasma concentrations of tyrosine and phenylalanine increased with placebo but not with carbohydrate intake, suggesting reduced protein breakdown.
Conclusions:
- Carbohydrate ingestion during exhaustive exercise enhances recovery and improves next-day performance.
- This improvement is linked to reduced metabolic stress and potentially less protein degradation, preserving muscle function.
- Nutritional strategies involving carbohydrate intake are vital for optimizing athletic recovery and performance.
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