Fig. 3.

Summary of the effect of acute-exercise- vs chronic-exercise-conditioned serum on human cancer cell biology. In humans, acute exercise serum (collected 0–24 h post exercise) induces serological changes that suppress cancer cell growth but that do not appear to induce apoptosis in vitro. In comparison, there appears to be no effect of exercise-training-conditioned serum (collected > 24 h post chronic exercise, when the acute effects of the last bout of exercise have subsided) on cancer cell proliferation