Journal
FOLIA BIOLOGICA-KRAKOW
Volume 59, Issue 3-4, Pages 203-209Publisher
POLISH ACAD SCIENCES, INST SYSTEMATICS EVOLUTION ANIMALS
DOI: 10.3409/fb59_3-4.203-209
Keywords
Swimming rats; blood rheology; fatty acid composition of erythrocyte membranes
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This is the first report on the effects of a single bout of swimming to exhaustion in cold water on rat erythrocyte deformability, aggregation and fatty acid composition in erythrocyte membranes. The results indicate that there was a significant decrease in body temperature of experimental rats swimming in water at 4 degrees C and 25 degrees C when compared to the control. Erythrocyte aggregation indices did not change after swimming in water at 4 degrees C whereas erythrocyte deformability increased at shear stress 1,13 [Pa] and 15,96 [Pa]. Physical effort performed in water at 4 degrees C when compared to the control group resulted in an increase in monounsaturated and polyunsaturated n-3 fatty acid content in erythrocyte membranes that influenced the increase in their fluidity and permeability even though that of polyunsaturated n-6 fatty acids decreased. Physical effort performed in 25 degrees C water resulted in an increase in saturated fatty acid content and a decrease in all polyunsaturated fatty acids and polyunsaturated n-6 fatty acids when compared to the control group. Swimming of untrained old rats in cold water affected rheological properties of erythrocytes in a negligible way while changes in the fatty acid composition of erythrocyte membranes were more pronounced.
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