NEW YORK (Reuters Health) – Exercise appears to be beneficial for patients suffering from cancer-related fatigue, both during and after treatment, a review of published studies indicates.

Nearly all cancer patients experience fatigue, Dr. Fiona Cramp and colleagues note in the latest issue of The Cochrane Library, a publication of The Cochrane Collaboration, an international organisation that evaluates medical research.

According to guidelines from the National Comprehensive Cancer Network, treatable factors that may be related to cancer-related fatigue, such as pain, emotional distress, sleep disturbance, anaemia, nutrition, activity level, and co-morbid illnesses, should be identified and treated.

However, there is no consensus regarding the effect of exercise on cancer-related fatigue once treatable causes have been addressed.

Cramp, of the University of the West of England in Bristol, UK, and colleagues searched the medical literature for controlled trials that evaluated the effect of exercise on cancer-related fatigue. They identified 28 studies involving 2083 participants. More than half of the studies involved women with breast cancer.

"Statistically significant improvements in fatigue were identified following an exercise programme carried out either during cancer therapy or following cancer therapy," the researchers report.

Most programmes involved moderate-intensity exercise performed two or three times per week.