During his career Koike won eight national titles.

[1] After the end of World War II, Koike became a coach for the Japanese national Olympic swimming team and chairman of the Japan Swimming Federation.

He was present in Barcelona during the 1992 Summer Olympics, when Kyoko Iwasaki won the gold medal.

In 1990 Koike received the Olympic Order in Silver, and in 1996 was inducted into the International Swimming Hall of Fame.

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