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J Appl Physiol 88: 2074-2080, 2000;
8750-7587/00 $5.00
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Vol. 88, Issue 6, 2074-2080, June 2000

Effects of swimming exercise on red blood cell rheology in trained and untrained rats

Ozlem Yalcin, Melek Bor-Kucukatay, Umit K. Senturk, and Oguz K. Baskurt

Department of Physiology, Akdeniz University Faculty of Medicine, Antalya, Turkey 07070

Red blood cell (RBC) mechanical properties were investigated after swimming exercise in trained and untrained rats. A group of rats was trained for 6 wk (60 min swimming, daily), and another group was kept sedentary. Blood samples were obtained either within 5 min or 24 h after 60 min swimming in both groups. In the untrained rats, the RBC aggregation index decreased to 2.60 ± 0.4 immediately after exercise from a control value of 6.73 ± 0.18 (P < 0.01), whereas it increased to 13.13 ± 0.66 after 24 h (P < 0.01). RBC transit time through 5-µm pores increased to 3.53 ± 0.16 ms within 5 min after the exercise from a control value of 2.19 ± 0.07 ms (P < 0.005). A very significant enhancement (166%) in RBC lipid peroxidation was detected only after 24 h. In the trained group, the alterations in all these parameters were attenuated; there was a slight, transient impairment in RBC deformability (transit time = 2.64 ± 0.13 ms), and lipid peroxidation was found to be unchanged. These findings suggest that training can significantly limit the hemorheological alterations related to a given bout of exercise. Whether this effect is secondary to the training-induced reduction in the degree of metabolic and/or hormonal perturbation remains to be determined.

hemorheology; erythrocyte deformability; erythrocyte aggregation; oxidant stress


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