Sports medicine has well developed with the generalization of various sports. Since the relationship between sports and anemia is an important problem in the field of sports medicine, we have examined hematological tests and iron metabolism, in addition to them, the ferritin levels in RBC, muscle type aldolase, CPK and myoglobin level in plasma after exercise in high school boy-students who belong to sport clubs. In addition, we have analyzed their subjective signs and knowledge, according to a questionnaire. The characteristics of the high school boy-students are as follows:
1. Hematological findings (RBC, Hb level, WBC and its differential count, and platelet count) are within normal limits, however, more than 20% of them showed hypochromic features.
2. According to the examination of their iron metabolism, elevated TIBC was observed in 26.6% of the first grade students. Furthermore, since most of the students showed decreased serum ferritin levels, it has been suggested that they are in the iron deficiency state.
3. Their RBC ferritin levels are generally decreased, suggesting the presence of iron deficiency.
4. Although increased levels of muscle-derived CPK (creatinine phosphokinase), muscle type-ALD (aldolase) are found, those are quite lower than the levels in patients with muscle diseases. Increased myoglobin levels are found in 16.5% of the first grade students. On the contrary, that is found in only one (2.8%) of the second grade students.
5. About 20% of them recognize their decreased knowledge and concentrating capacity, and fatigue.
　Based on these results, it has been suggested that high school boy-students who belong to sports clubs are in the iron deficiency state, in addition to, also in sport-myopathic state in relation to iron deficiency state. Since they may influence upon their school life, it seems like that some treatments are useful for them.

DESCENTE SPORTS SCIENCE Vol.8/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE