It is well known that high prevalence of iron deficiency state is found among athletes. And we have been also reporting the relationship between sports and anemia, finding that high school boy students who belonged to sport clubs were in the iron deficiency state and also in sport-myopathic state in relation to it.
　We have examined hematological tests and iron metabolism, in addition to them, haptoglobin, hemopexin, muscle type aldolase, CPK (Creatine Phosehokinese) and myoglobin levels in plasma, and urinary myoglobin level before and after intensive exercise in high school boy students who belong to sport clubs in order to know the influence of sports activity upon their hematological state and iron metabolism.
　Our results are as follows;
　1. From intensive exercise 5-6 hours later, hematological data (RBC, Hb, Ht) showed significant decrease compared with the data before exercise. It may be considered that the more intensive they do exercise the lower the date become.
　2. Serum iron and serum ferritin levels showed no significant difference both before and after exercise. But serum iron level was significantly lower than the control group, consisting of high school boys who didn't belong to sport clubs. Although there were no iron deficient state in high school boy non-athlete, there was typical iron deficiency anemia in 12% of high school boy athletes. On the other hand, TIBC level became significantly higher than the previous time, but it was unclear why it showed much higher values.
　3. Serum haptoglobin level showed significant decrease suggesting of intravascular traumatic hemolysis, but serum hemopexin level showed no significant difference both before and after exercise, suggesting that the hemolysis was not so severe.
　4. Serum CPK, myoglobin and muscle type aldolase levels showed significant increase after exercise, but those levels were quite lower than the levels in patients with muscle disease and we would like to propose so-called sport-myopathy for the results.
　5. Urinary myoglobin was recognized neither before nor after exercise based on this test.
　Our results show that the high school boy athletes have lower RBC count, hemoglobin concentration, hematocrit value than control high school boy. And it is considered partly because of the destruction of RBC associated with intensive daily exercise. Based on iron metabolism, it is considered that high school boy elite athletes have a high incidence of iron deficiency state and sport myopathic state.
　These findings suggest that intensive daily exercise may be closely associated with increased risk of iron deficiency and it may influence upon their school life. It seems like that some treatments are needed and are useful for them.

DESCENTE SPORTS SCIENCE Vol.9/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE