The purpose of this study is to clarify the effect of various physical conditions on time estimation and to estimate the time required 150m. and 250m. distance runs. Subjects were 16 male students in Sendai College, including long distance runners, throwers, sprinters, jumpers and the group as a control was consisted of 15 male students including the players of Judo, Kendo, Vollyball, Soccer, Gymnastics and Basketball. Experiment 1 Subjects were asked to estimate the exact time of 30" in rest and after 5 minutes\u27 exercise. Experiment 2 Subjects were asked to estimate the time required 150m. and 250m. distance run. The main findings were as follows: 1-1 Both groups had a tendency of over estimation in rest. 1-2 The time estimation after exercise, sprinters had a tendency of under estimation. Long distance runners, throwers, jumpers and control group had a tendency of over estimation. 1-3 There was significant difference between time estimation in rest and that after exercise. 2-1 In the time estimation of 150 m. distance run, both experimental group and control group had a tendency of under estimation. There was little difference in the time estimation between groups. 2-2 In the time estimation of 250 m. distance run, both groups had a tendency of under estimation. The longer the distance was, the more variable the time estimation was. Results are discussed in terms of intermediating factors
