Long-term intermittent hyperoxic exposures do not enhance erythropoiesis

Area of Science:

• Physiology
• Hematology

Background:

• Previous reports suggested increased erythropoietin (EPO) after short oxygen (O2) sessions.
• This led to advocating O2 administration as a potential therapy for anemia.
• The current study investigates this claim in healthy individuals.

Purpose of the Study:

• To evaluate the effect of daily short-term normobaric oxygen exposures on plasma EPO levels.
• To determine if repeated O2 administration can stimulate erythropoiesis in healthy subjects.
• To assess the validity of O2 therapy for anemia based on EPO response.

Main Methods:

• Twenty healthy men were divided into normobaric O2 (NBO2) and air (AIR) groups.
• The NBO2 group breathed 100% O2 for 2 hours daily over two weeks.
• Blood samples were collected to measure EPO concentrations at baseline, midpoint, and end of the study.

Main Results:

• Plasma EPO levels were significantly lower in the NBO2 group compared to the AIR group.
• The NBO2 group exhibited a slight, non-significant decrease in EPO during the intervention.
• These findings indicate that hyperoxia suppresses EPO production.

Conclusions:

• Daily short-term normobaric hyperoxia does not elevate EPO levels in healthy individuals.
• Increased oxygen tension appears to suppress EPO production.
• Oxygen administration is not warranted for enhancing erythropoiesis.