SEOUL, South Korea — South Korea’s human rights commission plans to interview thousands of adult and child athletes about a culture of abuse in sports after a wave of female athletes came forward to say they had been raped or assaulted by their coaches. The yearlong investigation will cover 50 sports and include children competing for elementary, middle and high schools, Park Hong-geun, an official from the National Human Rights Commission, said Wednesday. He said the commission aims to interview all minor and adult athletes competing for scholastic and corporate league teams in speedskating and judo, which have been marred with sexual abuse allegations.