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Erythrocyte alterations endurance exercise in horses
Summary
Endurance exercise in horses causes an initial increase in red blood cell count, hematocrit, and hemoglobin. However, prolonged exertion leads to a decrease in these values, suggesting a loss of red cell mass and an increase in spiculated red blood cells.
Area of Science:
- Equine physiology
- Exercise science
- Hematology
Background:
- Endurance riding is a demanding equestrian sport.
- Understanding physiological changes in horses during prolonged exercise is crucial for performance and welfare.
Purpose of the Study:
- To investigate the changes in erythrocyte parameters in conditioned horses during a 157-km endurance ride.
- To assess the impact of prolonged exercise on red blood cell mass and morphology.
Main Methods:
- Erythrocyte counts, hematocrit (Hct), and hemoglobin (Hb) were measured in 14 conditioned horses.
- Blood samples were collected before the ride, at multiple rest stops (44, 91, 130 km), and at the finish line.
- Morphological changes, specifically the presence of spiculated red blood cells, were observed.
Main Results:
- Significant increases in erythrocyte count (41%), Hct (30%), and Hb (33%) were observed at the first rest stop (44 km).
- Despite remaining elevated compared to baseline, these parameters decreased from the 44 km values later in the ride.
- A marked increase in the number of spiculated red blood cells was noted during exercise, correlating with changes in red cell indices.
Conclusions:
- Prolonged endurance exercise in horses leads to an initial hemoconcentration followed by a potential loss of red cell mass.
- The significant increase in spiculated red blood cells during exercise warrants further investigation into their role and implications.