Brain HealthWrist Accelerometers Predict Dementia Risk as Well as APOE Gene Testing
A large study of over 57,000 older adults found that sleep-wake cycle patterns measured by wrist accelerometers can meaningfully predict dementia risk. Researchers identified nine key metrics — including disrupted daytime activity, fragmented sleep, and abnormal sleep durations — that combined into two predictive components. Both were independently linked to higher dementia risk, and adding them to standard prediction models improved accuracy by an amount comparable to including APOE genetic status. This suggests that consumer wearables could become practical, scalable screening tools for identifying people at elevated dementia risk years before symptoms emerge, potentially enabling earlier lifestyle or medical interventions.
