Olympic gold medallist Nathan Cohen has withdrawn from Rowing New Zealand's summer training squad as he gets to grips with the heart problem which ruled him out of this year's world championships.

Cohen is among several members of New Zealand's world champs squad omitted from the squad of 45 - 27 men, 18 women - who will assemble at RNZ's high performance centre at Lake Karapiro on September 30.

During the heats of the quadruple scull event at Chungji, South Korea, Cohen's heart went out of rhythm, as he suffered an episode of supreventricular tachycardia.

Cohen, who won the double scull gold with Joseph Sullivan in at the London Olympics last year, is having his condition assessed.

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Others omitted from the squad include the entire men's four, who were a disappointment in the European campaign, and two other members of the quad, Fergus Fauvel and Hayden Cohen, and three of the women's eight.

The group includes several of the country's up and comers from the under 23 squad this year, including the entire men's eight, who won the gold medal at the age group world champs in Austria.

Summer training squad, starting September 30:

Men: Adam Ling, Alex Kennedy, Alistair Bond, Brook Robertson, Curtis Rapley, Duncan Grant, Eric Murray, Finn Howard, Giacomo Thomas, Hamish Bond, Isaac Grainger, James Hunter, Jeff Francis, Joe Wright, Joseph Sullivan, Karl Manson, Mahe Drysdale, Matthew Dunham, Michael Arms, Nathan Flannery, Peter Taylor, Robbie Manson, Shaun Kirkham, Stephen Jones, Toby Cunliffe-Steel, Tom Murray.

Women: Emma Twigg, Erin-Monique Shelton, Eve Macfarlane, Fiona Bourke, Genevieve Armstrong, Georgia Perry, Grace Prendergast, Julia Edward, Kayla Pratt, Kelsey Bevan, Kerri Gowler, Linda Matthews, Louise Ayling, Lucy Strack, Rebecca Scown, Sarah Gray, Sophie Mackenzie, Zoe Stevenson.