This study was performed to re-examine the validity of the Shuttle Stamina Test(SST)and the relationship between the SST and the 20-m Shuttle Run Test(20mS).The 20mS developed by Leger et al.(1982)has been newly authorized as an endurance test by the Japanese Ministry of Education.The 20mS was performed on a 20-m shuttle course, in which the running speed was increased every minute until the subject could not continue(all-out).The 20mS test score was evaluated by the total number of repetitions of 20-m runs.The Shuttle Stamina Test(SST)designed by Kaneko et al.(1986)was performed by self-paced running for 3 min on a 10-m shuttle course, and the test score was evaluated by the shuttle distance convered in 3 min.The subjects were 344 males and 184 females, comprising 323 primary school children ranging in age from 6 to 11 years and 205 college students ranging in age from 18 to 28 years.Thirty-seven college students underwent VO_2max measurements using a maximal bicycle ergometer test.The SST scores and VO_2peak value following SST were closely correlated with VO_2max(p<0.01).These significant levels of correlation in the SST were equal to those among VO_2max, 20mS score and VO_2peak following the 20mS.SST scores demonstrated highly significant correlations with 20mS scores for all age sex groups, including school children and college students.These results suggest that the SST is an appropriate field test for evaluating an individual's aerobic capacity(or general endurance capacity), and that it can be used as a substitute test for the 20-m Shuttle Run Test.