Phil Healy's eventful Olympic Games is over after she missed out on the 400 metres semi-finals in an agonising manner.

Healy looked to be in trouble midway through her heat but sped up in the last 50 metres and overtook two rivals to finish fourth.

The time of 51.98 seconds in the fifth heat was good enough to go through as one of the six fastest qualifiers with one race remaining.

Eleni Artymata of Cyprus bettered the Cork woman's time by 0.07s in fourth place in the final heat to ensure she secured the last available qualifying place as Healy dropped to seventh fastest and missed out.

Healy was part of the first ever Irish relay team to reach an Olympic final in the mixed 4x400m and admitted she was "below-par" in the 200m heats, but has reflected on becoming the first Irish athlete to compete in three events in a single Games.

"It was seven hundredths today, it was six hundredths yesterday, this is sport and it's the finest of margins," told RTÉ Sport.

"Yesterday I was disappointed to miss out by six hundredths. Today is my second fastest time ever outdoors. Of course I would love to be in a semi-final and I know what the other runs have taken from me, but I came out here to be the first Irish woman to do three events in athletics in the Olympics.

"We made history in the relay and I have to be happy. That performance today has erased yesterday for me so I will definitely be going home happy from these Games.

"This is my fourth time out. Each round takes an awful lot out of you. It's not a normal race, it's an Olympic Games and has an extra weight and emotion carried with it.

"Of course there is that disappointment to be one (person) short but I came out here, gave it absolutely everything and performed to the best of my ability. If I was 100% fresh, that was definitely going to be a personal best."