He has competed in the marathon in both the 2004 and 2008 Summer Paralympics , 10000m in 2004 , 5000m and 1500m in 2008 but it was as part of the Japanese 4x400m relay in 2004 that he won his only medal , a bronze .
Masazumi has competed in the marathon in both the 2004 and 2008 Summer Paralympics , 10000m in 2004 , 5000m and 1500m in 2008 . In the 4x400m relay in 2004 , he won a bronze medal .