Ken-ichi Hasegawa (lvbgeya seirpto Hlgh School) The purpose of this study was to revea1 the physological changes that occured during the running over 2 hours from the view point of the training for marathon race. A highly trained man (25 years old, 52 kg.) served as the subject who had the record of 2:20:06 at the marathon race. The heart tate, respiratory rate, pulmonary ventilation and oxygen intake were measured during and after the subject ran for 150 minutes at the speed of 200m/min. on

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... treadrnill with 4.36% slope. From these measurements, oxygen pulse, tidal volume and oxygen removal were calcu!ated. The results are as follows: 1) The body weight decreased approxirnately 2.9dg(5.6%) after the runing. 2) The average oxygen intake was 2.31 11min. (SDO.07 11min,) being kept in steady state from 2 min. after the start to the end of running. The heart rate increased gradually throughout the running from 83 to 165. Acoordingly the oxygen pulse decreased with the lapse of time from 17.7cc to 13.5cc. 3) The pulmuary ventilation was kept in steady state (Av. 75.0 11min., SD 3.9 !/min.) from 1.Smin. after the start to 130 min., and increased from 75.61!rnin. to 82.6 1/min. during the last 20min. The respiratiry rate increased from 41 to 62 during running, therefore the tidal volume decreasd gradually from 1.68 1. to 1.31 1. toward the end of running. 4) The oxygen removal was highest (43.7ccll) at the initial period of running, but gradually decreased with the lapse of time and, it was nearly 35cc!1 at the last 20 rnin.