Reacción a "Brief breaks during each hour of sedentary behaviour are associated with a lower risk of death from cancer"

This study reinforces the observational evidence that not only does the amount of exercise we do matter, but so too does the length of time we spend sitting uninterrupted. Its main contribution is to shift the focus towards everyday movement patterns, suggesting that even brief interruptions to sedentary behaviour may have biological significance. However, it is important to distinguish between association and causation. This is an observational study, and physical activity was measured over just seven days, meaning it cannot establish a causal relationship.

In this context, it is particularly noteworthy that recent randomised trials, such as the CHALLENGE trial published in NEJM, have shown that structured exercise programmes following treatment for colon cancer improve survival and reduce the risk of recurrence. Taken together, the current evidence suggests that both regular exercise and reducing sedentary behaviour should be regarded as complementary components of cancer prevention and oncology care.