Yoga regulates stress and fights fatigue in women undergoing treatment for breast cancer.

For women with breast cancer undergoing radiation therapy, yoga offers unique benefits beyond fighting fatigue, researchers said.

Simple stretching exercises counter-acted fatigue. Patients, who participated in yoga exercises that incorporated controlled breathing, meditation and relaxation techniques into their treatment plan, experienced improved ability to engage in their daily activities, better general health and better regulation of cortisol (the stress hormone).

Women in the yoga group were also better equipped to find meaning in the illness experience.

The study assessed, for the first time, yoga benefits in cancer patients by comparing their experience with patients in an active control group who integrated simple, generic stretching exercises into their lives.

The study, conducted by Lorenzo Cohen at the University of Texas's M D Anderson Cancer Centre, is part of an effort to scientifically validate mind body interventions in cancer patients.

"Combining mind and body practices that are part of yoga clearly have tremendous potential to help patients manage the psycho-social and physical difficulties associated with treatment and life after cancer, beyond the benefits of simple stretching," Cohen said.

Participants in the yoga and stretching groups attended sessions specifically tailored to breast cancer patients for one hour, three days a week throughout their six weeks of radiation treatment.

They were asked to report on their quality of life, including levels of fatigue and depression, their daily functioning and a measure assessing ability to find meaning in the illness experience.

Women who practiced yoga had the steepest decline in their cortisol levels across the day, indicating that yoga had the ability to help regulate this stress hormone.

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How yoga benefits breast cancer patients