VR-based Physical Activity and Reminiscence Therapy

The aim of study is to investigate the effect of active Physical activity + virtual reality cognitive therapy (aPAVRCT) on cognitive function in older adults with Alzheimer's Dementia and related dementias. The investigator hypothesizes the "Physical activity + virtual environment brain stimulations' would slow the process of AD cognitive decline. The life satisfaction score in the intervention group would be higher than that of the control group. The investigator will conduct measurements on three aspects: The Chinese version of the MoCA, physical functions, and emotional changes. Data will be collected at baseline, 4-week, 8-week, 12-week after interventions for the two groups, and a follow-up measurement. In addition, the investigator will use some qualitative methods, such as focus group, interview, observation, during and after the first 3-month intervention to identify some issues during the intervention and to probe caregivers. The investigator will use both the Ttest between the two groups (to compare cognitive decline progressions, and life satisfaction) and mixed methods to illustrate life satisfaction, especially among caregivers.