A mother with a heart disease will embark on a sponsored husky sledding expedition to help others with her condition.

Tina Amiss, a physiotherapist from Greenford, has lined up a demanding five-day sub-zero challenge at the Pallas-Ounas National Park in western Finland, starting on January 26, as a belated 50th birthday celebration.

Mrs Amiss, who suffers from cardiomyopathy, a muscle disease which can affect the size, shape or electrical system that makes the heart beat, plans to cover up to 40km a day on her trip.

The mother of two will travel through forests and over frozen lakes and rivers in temperatures dropping to -20C at night.

She is raising money for the Cardiomyopathy Association (CMA), a charity which provides information and support to affected families, and of which she is a trustee.

Mrs Amiss, who has her cardiologist’s approval for the venture, said: “I love skiing and dogs, and wanted to combine the two.

“Initially I didn’t know too much about what it involved, but I’ve spoken to some people who have tried it and I feel very excited to be taking part.

“It’s a once in a lifetime experience.”

She added: “I don’t normally deal well with the cold, but we will be going well prepared.”

The physiotherapist was diagnosed 20 years ago after suffering two cardiac arrests. She was resuscitated both times by fireman husband Peter.

She now has an internal defibrillator which shocks her heart if it develops a dangerous rhythm.

The charity’s services include cardiomyopathy support nurses, organising information days around the country, support groups and a network of affected volunteers who provide support to others by phone and email.

Mrs Amiss said: “I wanted to give something back to the CMA in return for all the help and advice they have given me since my diagnosis – and for always being there.”

Visit www.justgiving.com/TAMISS to sponsor Mrs Amiss or www.cardiomyopathy.org for more information on cardiomyopathy.