It was reported that in recent years the number of athletes suffered with sports anemia has been less than it was before. Nevertheless, the reduction of hemoglobin concentration, caused by training, but not reaching the criteria of sports anemia has been often seen. This phenomenon induces the decrease of erythrocyte in O2 and CO2 transport as well as energy metabolism, the result of which is the decrease of exercise capacity. As for the new problem of exercise-induced lower hemoglobin, it was f...