Does erythrocyte infusion improve 3.2-km run performance at high altitude?

Area of Science:

• Sports Medicine
• Altitude Physiology
• Exercise Science

Background:

• High altitude exposure (4300 m) significantly impairs exercise performance.
• Autologous erythrocyte infusion is a potential ergogenic aid, but its effects at altitude are unstudied.

Purpose of the Study:

• To investigate the impact of autologous erythrocyte infusion on 3.2-km run performance at high altitude.
• To assess physiological responses during high-altitude exercise following erythrocyte infusion.

Main Methods:

• Eighteen unacclimated male subjects were divided into erythrocyte-infused (ER) and control (CON) groups.
• Subjects performed 3.2-km runs at sea level (SL), and after 3 days (HA3) and 14 days (HA14) at 4300 m.
• ER group received 700 ml autologous erythrocytes (42% hematocrit); CON received saline alone.

Main Results:

• No significant differences in 3.2-km run times were observed between ER and CON groups at SL, HA3, or HA14.
• Run times were significantly slower at HA3 and HA14 compared to SL for both groups.
• Heart rates and ratings of perceived exertion did not significantly differ between groups, though some altitude-related increases were noted.

Conclusions:

• Autologous erythrocyte infusion did not yield significant improvements in high-altitude running performance.
• A trend towards faster times was observed in the erythrocyte-infused group, warranting further investigation with larger sample sizes.