[Cardiopulmonary exercise testing before and after blood donation]

Area of Science:

• Exercise Physiology
• Sports Medicine
• Hematology

Context:

• The relationship between hemoglobin and physical capacity is well-established, forming the basis of blood doping.
• Blood loss, such as through voluntary donation, is known to decrease physical performance.

Purpose:

• To investigate the impact of voluntary blood donation on physical performance and its underlying physiological mechanisms.
• To quantify the reduction in maximal oxygen uptake, work rate, and exercise duration post-donation.

Summary:

• Voluntary blood donation (500 mL) led to a significant decrease in hemoglobin levels (9%), maximal oxygen uptake (9%), and maximal work rate (13%).
• The anaerobic threshold shifted to a lower percentage of maximal oxygen uptake post-donation, indicating earlier onset of anaerobic metabolism.
• Recreational endurance athletes experienced a more pronounced reduction in endurance capacity compared to sedentary individuals.

Impact:

• Maximal physical performance is demonstrably reduced following blood donation, with hemoglobin decline being the primary driver of decreased oxygen uptake.
• The findings suggest that incorporating hemoglobin levels into predictive equations for maximal oxygen uptake could enhance accuracy.
• Understanding these effects is crucial for managing donor recovery and optimizing athletic performance strategies.