A member of Japan's synchronized swimming team had to be helped out of the pool during Saturday's final after she apparently fainted.
Hiromi Kobayashi, a 23-year-old from Osaka competing in her first Olympics, was taken off the deck on a stretcher.
After Japan's number concluded, two men in swimsuits jumped into the pool to assist the team, which was helping Kobayashi to the side. The other team members climbed out to await their scores, while the ailing woman clung to the pool's edge.
Kobayashi was lifted out and she buckled to her knees. Her body and head went limp as she was carried away. She was wrapped in a white sheet and rushed away on the stretcher, attended to by several volunteers and medical personnel.
Hiroshi Takeuchi, press officer for the Japanese team, said Kobayashi hyperventilated because of stress.
"That kind of thing has happened to her before," he said. "She is good. Don't worry, she's not in serious condition."
He said Kobayashi was conscious and resting at the arena, and did not require a hospital visit.
The Japanese team tied the United States for fifth in the final. Japan was assessed a two-point penalty for touching the bottom of the pool during its routine.