Physical activity, sedentary behavior, and sleep in everyday life after childhood cancer - a report from the Swiss Childhood Cancer Survivor Study (SCCSS)-Activity

For many people, the path to long-term health after surviving a serious illness involves more than just medical checkups; it requires paying attention to how the body moves and rests during the ordinary hours of the day. Scientists have long understood that childhood cancer survivors face a higher risk of developing chronic health problems later in life. To counter this, experts recommend a specific balance of daily habits: moving the body with enough energy to raise the heart rate, limiting the time spent sitting still, and getting a full night's sleep. While doctors often ask patients about these habits, self-reported answers can be unreliable because people tend to overestimate how much they move or underestimate how much they sit. To get a clearer picture of what is actually happening in the lives of these survivors, researchers have begun using small, wearable devices that track movement continuously, offering an objective view of daily life that questionnaires cannot provide.

A recent report from the Swiss Childhood Cancer Survivor Study brings this approach to a new group of participants, focusing on how children and adults who survived cancer spend their days and nights. The researchers recruited 108 survivors, including 68 children between the ages of five and seventeen, and 40 adults. Each person agreed to wear a small sensor on their thigh for eight consecutive days. This device, which stays on while the person sleeps, eats, and goes about their daily routine, records every shift in posture and movement. By analyzing this data, the team could distinguish between different types of activity, such as moderate-to-vigorous exercise, the time spent sitting or lying down, and the actual duration of sleep. They separated the results by age to see if the patterns differed between the younger survivors and the adults.

The data revealed a daily life dominated by stillness. The children in the study spent a median of 578 minutes each day sitting or lying down, while the adults sat for an average of 603 minutes. This means that for nearly ten hours a day, these survivors were not moving. Within that time, both groups spent four to five hours in long, uninterrupted stretches of sitting that lasted at least thirty minutes at a time. When it came to movement, the numbers were lower than health guidelines suggest. The children engaged in a median of 85 minutes of moderate-to-vigorous physical activity per day, and the adults averaged 78 minutes. Sleep also fell short of recommendations, with children sleeping a median of 466 minutes per night and adults sleeping 435 minutes. Perhaps most telling is that when the researchers looked at all three habits together, only 9 percent of the children and 20 percent of the adults met the recommended targets for physical activity, limited sitting, and sufficient sleep all at once.

The study also identified specific factors that seemed to influence these daily patterns. Survivors who had received radiotherapy as part of their cancer treatment were more likely to have lower physical activity levels among the children and higher amounts of sitting time for both children and adults. Age played a role as well; the older children in the group moved less, slept less, and sat more than their younger counterparts. These findings suggest that the challenges of maintaining a healthy daily rhythm are not just a matter of willpower but are deeply tied to the medical history and age of the survivor. The researchers conclude that healthcare providers should focus their efforts on encouraging physical activity, particularly for adolescent survivors and those who underwent radiotherapy, while also helping all survivors improve their sleep and break up long periods of sitting. By understanding the reality of how these survivors move and rest, doctors can offer more targeted support to help them build a healthier future.