Challenging traditional carbohydrate intake recommendations for optimizing performance at high altitude

Area of Science:

• Exercise physiology
• Altitude medicine
• Nutritional science

Background:

• Traditional recommendations suggest increasing carbohydrate intake for high-altitude performance.
• Emerging evidence challenges these long-held beliefs.

Purpose of the Study:

• To review current evidence on carbohydrate metabolism and utilization at high altitude.
• To challenge conventional nutritional advice for athletes at altitude.

Main Methods:

• Review of recent scientific literature on high-altitude physiology and metabolism.
• Analysis of studies investigating exogenous carbohydrate oxidation during exercise at altitude.

Main Results:

• Exogenous carbohydrate oxidation is reduced at high altitude compared to sea level.
• Carbohydrate ingestion does not improve exercise performance at altitude, even after acclimatization.
• Hypoinsulinemia, accelerated glycogenolysis, and reduced glucose uptake contribute to impaired carbohydrate utilization.
• Gut microbiome alterations may play a role in hypoxia-mediated metabolic dysregulation.

Conclusions:

• Traditional carbohydrate recommendations may not be optimal for high-altitude performance.
• Novel nutritional or pharmacological interventions are needed to address metabolic dysregulation.
• Enhancing carbohydrate oxidation could improve performance for individuals newly arrived at high altitude.