The authors recognize that the methodological differences of the studies make it difficult to establish this beneficial relationship, although there is evidence that supervised physical exercise programs reduce some of the physical, psychological and emotional symptoms derived from cancer and its treatment. In any case, more research is required to determine whether physical exercise in cancer survivors can reduce the risk of relapses and increase survival time.
In these four of these six studies, conducted between 1994 and 2000 with different physical activity regimens (static cycling, walking, or training to increase muscle strength), some improvement in the immune system was observed, such as greater activity or better functionality of certain immune cells.
