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Infusing 400 mL of red blood cells (RBCs) significantly improved 10-km race times in highly trained runners. This RBC infusion enhanced performance, likely by increasing oxygen delivery to muscles.
Area of Science:
- Sports Science
- Exercise Physiology
- Blood Transfusion Research
Background:
- Athletic performance is influenced by oxygen-carrying capacity.
- Red blood cell (RBC) infusion, or induced erythrocythemia, is explored as a method to enhance endurance.
- Understanding the physiological effects of autologous RBC infusion is crucial for performance optimization.
Purpose of the Study:
- To determine the impact of 400 mL autologous red blood cell (RBC) infusion on 10-km race performance.
- To assess changes in hematocrit, heart rate, and blood oxygen parameters post-RBC infusion.
- To evaluate the efficacy of induced erythrocythemia in improving endurance capacity.
Main Methods:
- A double-blind, placebo-controlled, crossover study involving six male distance runners.
- Participants completed three 10-km races: pre-infusion, post-saline infusion, and post-RBC infusion.
- Physiological markers including hematocrit and heart rate were monitored, alongside race times.
Main Results:
- RBC infusion led to a significant increase in hematocrit.
- A significant improvement in 10-km race time was observed after RBC infusion.
- No significant changes were noted in 2,3-diphosphoglycerate or partial pressure of oxygen at 50% hemoglobin saturation.
Conclusions:
- Infusion of 400 mL of autologous packed RBCs effectively enhances 10-km track race performance.
- The performance enhancement is likely attributed to increased oxygen delivery to exercising muscles.
- Induced erythrocythemia through RBC infusion demonstrates potential for improving athletic capacity.
Abstract:
The purpose of this study was to investigate the effect of infusion of 400 mL of red blood cells (RBCs) on 10-km track race time, submaximal heart rate, hematocrit, 2,3-diphosphoglycerate, and partial pressure of oxygen at 50% hemoglobin saturation. Six highly trained, male, distance runners twice donated a unit of RBCs, which was frozen for subsequent reinfusion. Eleven weeks after the second donation, they undertook a series of three competitive 10-km races on a standard 400-m track: before infusion, after 100 mL of saline solution, and after 400 mL of autologous, previously frozen deglycerolized RBCs. All subjects took all trials in this double-blind, placebo, crossover, experimental design. Running time was recorded at each 400-m split, and blood was collected prior to each trial. The data were analyzed by analysis of variance. Results following the RBC infusion showed a significantly higher hematocrit concentration, a significantly faster 10-km run, a nonsignificant decrease in submaximal heart rate (10 beats faster 10-km run, a nonsignificant decrease in submaximal heart rate (10 beats per minute), and no significant changes in either 2,3-diphosphoglycerate or partial pressure of oxygen at 50% hemoglobin saturation. Erythrocythemia induced by the infusion of 400 mL of autologous packed RBCs effectively increased performance capacity in a 10-km track race, probably due to an increase in oxygen delivery to the working muscles.