Why you move—not just how often—could affect dementia risk
For years, scientists have known that regular physical activity can help lower the risk of dementia. But new USC research suggests that it's not only the amount but also the activity's context—for work or for leisure—that makes a difference.
This new study challenges the widely held belief that any amount of physical activity can protect against dementia. Researchers from the University of Southern California found that not all physical activity is created equal, and the context in which an activity takes place can make a significant difference in one's dementia risk.
The analysis, which reviewed data from over 4.2 million individuals across 30 countries, revealed that leisure-time exercise, such as walking, cycling, or playing sports, is associated with a 24% lower risk of dementia compared to those who are least active. In contrast, physical labor performed at a job was linked to a 20% higher risk of developing dementia.
The researchers suggest that the difference likely stems from the varying circumstances of the activities. Leisure-time exercise is typically self-directed, enjoyable, and often accompanied by social interaction or stress reduction. On the other hand, occupations that require physically demanding labor may involve repetitive tasks, prolonged standing, heavy lifting, limited recovery time, and exposure to workplace hazards.
These factors can contribute to psychosocial stress, lower job control, hazardous working conditions, and greater exposure to air and noise pollution—factors that have independently been tied to increased dementia risk. The study emphasizes the importance of considering the context of physical activity when it comes to brain health.
While engaging in regular exercise is beneficial, it is not enough to protect against dementia if that activity is performed as part of a physically demanding job.
Written by urgent.news from Medical Xpress's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
