Following his accident in 1969, Nitz became active in the sports club that had been formed within the Paraplegic Welfare Association in Queensland in the 1960s. He has been a member of the Sporting Wheelies and Disabled Association since the prior club reformed in 1977. At the 1982 Far East and South Pacific (FESPIC) Games for the Disabled in Hong Kong, Nitz medalled in all of his events, winning 3 golds (200m, 400m and ) and 2 silvers (100m and 1500m Paraplegic 2 class). As one of 157 Australian athletes to compete in 1982, his record contributed significantly to Australia's win of 315 medals at those games. As a long-term member of the Sporting Wheelies and Disabled Association, Nitz also represented Queensland in the following major sporting events:
