The women's 4x400m relay team qualified as the Games as the 13th ranked team in the world.

The qualification period for the men’s and women’s 4x100m and 4x400m relays at the London Games ended on Monday 2 July, with the IAAF officially naming the Irish women’s 4x400m team as one of the 16 qualified teams, with the team placing 13th overall behind Italy.

The Ireland women's 4x400m relay team consists of four starting athletes and two reserves:

Joanne Cuddihy (KCH AC)

Age 28, from Kilkenny City, Cuddihy is Ireland’s one-lap wonder and was the first Irish female to run the 400 metres in under 51 seconds. She is the national title holder.

Cuddihy comes from a talented family and is a qualified medical doctor and a highly-rated violinist. This is her second Olympics, and she has been training full-time in Australia for the London Games for the past year.

Michelle Carey (Dublin Striders AC)

This top Dublin athlete is making her second Olympic appearance after competing in Beijing in the 400 metres hurdles.

Now 31, Carey is usually based in the UK and is a primary school teacher. She competed in the World Championships in Korea as part of Ireland’s relay team.

Claire Bergin (DSD AC)

Bergin enters the Irish sporting record books by being the first female to compete for Ireland at both the Summer and Winter Games. In 2010, Bergin was part of Ireland’s superb women’s bobsleigh team at the Vancouver Winter Olympics.

From Dublin, Bergin is 27 and is a trainee chartered accountant, and a key member of the relay team that competed at the World Championships in Korea.

Marian Heffernan (Togher AC)

A native of Cork City, Heffernan is part of Ireland’s latest high-profile sporting couple, being married to Ireland’s renowned Olympic race walker Rob Heffernan.

Heffernan is fifth in the all-time Irish record books for the women’s 400 metres. She has spent time in Australia training for the London Games with her husband, and is a fully qualified sports injuries therapist.

Jessie Barr (Ferrybank AC)

The Ferrybank, Co Waterford, athlete is one of the most promising 400m hurdles athletes in the country, achieving a PB at the recent European Championships in Helsinki and making the final.

Only 22, Barr comes from an athletics family and is the Irish under-23 record holder and a talented 400m performer with a big future.

Catriona Cuddihy (Kilkenny City Harriers)

The Kilkenny City Harriers athlete has been recently training in Australia and has had a very successful junior career.

Cuddihy is 26-years-old and was initially included on the relay team, before being replaced by Joanna Mills, after the Ballymena & Antrim AC athlete launched a successful appeal with Athletics Ireland.

However, Cuddihy launched a successful counter appeal with the OCI and was reinstated on the 4x400m team.

She is a sister to 400m star,and relay team-mate, Joanne Cuddihy.

First in action on 9 August in round 1. Start time is 6.30pm.