A single bout of physical activity could fill the bloodstream with cancer-busting allies.

In an experiment involving 32 breast cancer survivors, a 45-minute session of either resistance training or high-intensity interval training resulted in a surge of messenger proteins in the blood.

When these players, called myokines, were introduced to breast cancer samples in the lab, they suppressed the growth of tumors by up to 30 percent.

"The results from the study show that both types of exercise really work to produce these anti-cancer myokines in breast cancer survivors," says lead author and exercise researcher Francesco Bettariga from Edith Cowan University in Australia.

"The results from this study are excellent motivators to add exercise as standard care in the treatment of cance

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