Speedskating star Nao Kodaira has vowed to strike gold at the Pyeongchang Olympics as a tribute to her late friend and former teammate Miyako Sumiyoshi.

Kodaira was left devastated after Sumiyoshi, who skated for Japan with Kodaira at the 2014 Sochi Games, was found dead in her home in Nagano last month aged just 30.

The cause of Sumiyoshi's death and other details were not publicly disclosed, with the wake and funeral held privately in line with her family's wishes.