Leisure-Time Physical Activity Linked to Lower Dementia Risk, Occupational Activity to Higher Risk
New research indicates that the context of physical activity significantly influences its impact on dementia risk. A meta-analysis of 74 studies, involving over 4.2 million individuals across 30 countries, found that engaging in higher levels of leisure-time physical activity is associated with a 24% lower risk of dementia. This includes activities such as walking, running, swimming, and cycling. Conversely, occupational physical activity was linked to a 20% higher risk of dementia. The study, published in The Lancet Public Health, challenges the notion that all physical activity equally benefits brain health, suggesting that repetitive, low-complexity tasks often found in physically demanding jobs may limit cognitive reserve accumulation. Researchers from the University of Southern California (USC) highlighted that the higher risk from occupational activity might also be influenced by environmental factors like air and noise pollution, and reduced opportunities for recreational exercise due to fatigue or ... 
