| This project mainly studies the effects of breathing 70% oxygen on hemorheology after incremental exercise to exhaustion. The blood viscosity (BV), plasma viscosity (PV), erythrocyte aggregation index (Al and A2), erythrocyte deformability index (TK), erythrocyte rigid index (VR) and hematocrit (Hct) were obtained and analyzed. The VO2 max, HL, HR and PO2 were measured and analyzed quantitatively as well. And the correlations of these indexes with hemorheology markers were analyzed. The Purpose of this present study is to know whether breathing 70% oxygen after exercise is helpful or not for the recovery of hemorheology and to find out a good mode for acceleration of revival of sports fatigue.7 male students complete one incremental exercise to exhaustion, physio-rest 30min after exercise (as the control group). And after 7 days these 7 students complete another identical exercise, breathing 70%oxygen 30min after exercise (as BO group). The BV, PV, Al, A2,TK, VR, HCT, HR, HL, Blood Oxygen Saturation were measured at rest, post-exercise immediately, 15min, 30 min respectively. Two different modes of recovery after incremental exercise were compared.The results as follows:(1) The disorder of hemorheology was caused by incremental exercise to exhaustion. The BV, PV, Al, A2, TK, VR and HCT increased significantly after exercise. It indicated that the abnormality of hemorheology after incremental exercise may be one of causes for sports fatigue. Therefore it is necessary to use some protective measures to prevent the abnormal changes of hemorheology or to accelerate the recovery of abnormal hemorheology.(2) Breathing 70%oxygen after incremental exercise could accelerate therecovery of abnormal hemorheology significantly. This experiment studied the effects of 70% oxygen on hemorheology after exercise. The results indicated that except of the PV, the recovery velocity of other hemorheology markers in BOgroup were lower significantly than those of control group. The recovery velocity of 70%oxygen group was faster than control group. Thus breathing oxygen was effective as one of the recovery measures after exercise.(3) The recovery velocity and mechanism of each hemorheology marker may be different. PV recover fastest among all the hemorheology markers, recovering to quiet level ISmin postexercise. And the PV recovery velocity of control group was faster than BOgroup. It indicated that the mechanism of PV recovery may be different and breathing 70% oxygen was not helpful for PV recovery. At the same time, the most slowness was Erythrocyte rheology, BLV and A2 after 30min in phsio-rest group significantly higher than quiet value. Thus it is necessary to adopt some measures to accelerate the recovery of the slow recovered Erythrocyte rheology. (4)Breathing 70% oxygen was specially significant for the recovery of Erythrocyte rheology. Compared with slowest recovery of Erythrocyte rheology at phsio-rest state, fastest recovery velocity of Erythrocyte rheology was observed when breathing 70%oxygen after exercise. And the change tendency of Erythrocyte rheology was exactly adverse to that of blood oxygen saturation. It showed blood oxygen concentration was closely correlated with Erythrocyte rheology. Breathing 70% oxygen after incremental exercise has auxo-action on recovery of Erythrocyte rheology.(5) The changes of hemorheology were closely correlated with those of blood oxygen saturation. This paper analyzed the correlations between hemorheology markers and blood oxygen saturation, finding: the changes of BV, PV, HCT and TK, Al, A2, VR in BOgroup had high negative correlations with those of blood oxygen saturation. And high blood oxygen saturation was followed by satisfactory hemorheology properties. It indicated breathing 70% oxygen could ameliorate hemorheology properties by improving blood oxygen saturation.(6) Blood Lactic Acid interacted hemorheology properties. This study found the changes of Blood Lactic Acid were significant positively correlated with those of BV, PV,...
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