[1] Together with her partner Ai Kondo, she was named one of the country's top sailors in the double-handed dinghy for the 2008 Summer Olympics, finishing in a lowly fourteenth place.

Outside her Olympic career, Kamata collected a total of two medals (a gold and a silver) in a major international regatta, spanning the World Championships and the Asian Games.

Kamata made her international debut with Kondo at the 2006 ISAF RS:X Worlds in Rizhao, China, picking up a runner-up spot on the women's side after their close duel with the Dutch crew of Marcelien de Koning and Lobke Berkhout for the gold.

[5] Entered the Qingdao regatta as the newly-crowned world ranking leaders, the Japanese duo had a terrible performance in the initial half of the series with marks lower than the top ten.

They staged a magnificent comeback in the second half by winning races 6 and 9, but another technical error on the last leg saw both Kamata and Kondo tumble down the leaderboard to a lowly fourteenth overall with 93 net points.