Facilitating the Measurement and Treatment of the Behavioral Symptoms of Dementia (BPSD) and Understanding Caregiver Burden Using Wearable Devices in Rural Taiwan - A Dyadic Feasibility Pilot Study

Taiwan is predicted to become a super-aged society, with people older than 65 years accounting for more than 20% of the population. As the prevalence of Alzheimer's dementia (AD) increases with age, the number of people living with AD will continue to rise. Most of these individuals will experience at least one type of behavioral and psychological symptom of dementia (BPSD). These symptoms not only worsen patients' quality of life but also increase caregiver burden, leading to depression, sleep disturbances, and reduced well-being among caregivers themselves.

Currently, questionnaires completed by caregivers are the main tools used to assess and monitor BPSD. Although validated, these questionnaires can only capture cross-sectional information. In a super-aged society where many caregivers are also older adults with cognitive or physical decline, the accuracy of such assessments may be limited. Previous studies, including our research in the United Kingdom, have shown that even patients with late-stage AD can successfully wear a research-grade actigraphy device (Geneactiv) with good compliance. Device-based measurements offer continuous and objective data and can reveal valuable indicators such as the Sleep Regularity Index (SRI), which may predict both cognitive and physical function over time.

Most treatments for BPSD rely on medications, many of which are not specifically approved for this use and may increase the risk of falls or mortality. Non-pharmacological approaches, such as light-based therapy, provide a promising alternative. The Re-Timer device (an eyewear that emits blue-green light) has demonstrated effectiveness in improving sleep and mood in the general population, with a favorable safety profile. If accepted by individuals with dementia and their caregivers, such wearable devices may reduce sleep problems, agitation, and depressive symptoms, thereby improving the overall quality of life for both groups.

To date, very few studies in Taiwan have applied wearable devices to dementia care. This pilot study therefore aims to evaluate the feasibility and acceptability of two wearable technologies, the Geneactiv actigraphy and the Re-Timer light therapy glasses-among people with Alzheimer's dementia and their caregivers. Ten patient and caregiver pairs will be recruited and followed for twelve weeks. Participants will wear the Geneactiv wrist device for eight weeks and the Re-Timer glasses for four weeks. Sleep quality, behavioral symptoms, caregiver burden, and user experience will be assessed through both questionnaires and device data.

The primary goal is to determine whether dementia patients and caregivers can safely and consistently use these devices. Secondary goals include exploring the preliminary effects of Re-Timer on sleep and BPSD, comparing traditional questionnaire results with digital measurements, and establishing a foundation for future large-scale studies to develop digital biomarkers and technology-assisted interventions for dementia care in Taiwan.