Koji Murofushi said Monday he will not take part in the national championships at the end of June, putting an end to his 20 straight titles in men's hammer throw.
"I feel my indefinite participation could hinder next generations coming through. I'm hoping for the emergence of youngsters who can compete in the world," said the 40-year-old.
"I've been taking part in a hope that my junior fellows could use me as a spring board. I think I've done my job winning 20 titles.
"I will compete in this championship anytime if there are no young throwers succeeding me," said Murofushi, who added he will reveal his plan heading into the 2016 Olympic Games in Rio de Janeiro after the turn of the year.
Murofushi first participated in the national championships in 1992 and has won 20 titles in a row since winning his first in 1995. He won a gold medal in the 2004 Athens Olympics and a bronze in 2012 Games in London.