Career
Her personal best time for the 800m race was 1:59.0 hand timed, set in 1976. That has remained the Australian record for thirty-eight years, as of February 2014. In her first Olympic competition in Munich, 1972, Rendina set an Olympic record (5190 seconds in her heat) on her way to the 400 metres final where she eventually finished in sixth place in 51.99 seconds.
She was also in the final of the 4 × 400 m relay where she ran a 50.7 leg for the Australian team that came in 6th in 3:28.84.
At the 1974, she moved up to the 800 metres distance and took gold. At the 1976 Olympics she was eliminated after finishing 5th in her semi-final in 2:00.29 at 800m.
She was part of the Australian 4 × 400 m relay team that finished 4th in 3:25.56 – her leg being timed at 51.6 seconds.