BLOOD COMPONENTS OF MIDDLE AND OLD AGED RUNNERS IN MARATHON RUNNING

The purpose of this study was to investigate the changes of blood components of middle and old aged runners in marathon running. The results were as follows. 1) Mean running time of marathon was 250 min. Some of subjects did last spurt. 2) Change of body weight was -4.8%. RBC, Hct, and Hb were changed by -4.8%, -4.4%, and -4.7% respectively. The decrease of plasma volume was 7.8% according to Dill's method. 3) Blood glucose was 112 mg/dl at rest and decreased to 70 mg/dl after running. The glucose level of five subjects was in range from 59 to 50 mg/dl. 4) The increase of L.A. was 52%. The L.A. after running tended to correlate to the running speed at last spurt. 5) T.G. significantly decreased after running. On the contrast, FFA increased by 323%. This increment of FFA correlated to mean running speed (r=0.681, P