Metabolic basis to Sherpa altitude adaptation

Area of Science:

• Human physiology
• Altitude adaptation
• Metabolic research

Background:

• Himalayan Sherpas are adapted to high-altitude hypobaric hypoxia.
• Enhanced oxygen delivery is a known adaptation.
• The role of tissue oxygen utilization in Sherpa adaptation is unknown.

Purpose of the Study:

• To investigate metabolic adaptations in Sherpas compared to Lowlanders.
• To explore differences in tissue oxygen utilization at high altitude.

Main Methods:

• Parallel molecular, biochemical, physiological, and genetic analyses.
• Study of Sherpas and Lowlanders before and during ascent to Mount Everest Base Camp (5,300 m).

Main Results:

• Sherpas showed lower fatty acid oxidation capacity in skeletal muscle.
• Sherpas demonstrated enhanced oxygen utilization efficiency and improved muscle energetics.
• Sherpas exhibited protection against oxidative stress, linked partly to a PPARA gene allele.

Conclusions:

• Metabolic adaptations, including enhanced oxygen utilization, underpin human evolution to high-altitude life.
• Findings may impact understanding of diseases involving hypoxia.