Effects of the Fully Immersive Leisure-based Virtual Reality Cognitive Training for Community-dwelling Elderly

The dual-task tests will be assessed to determine the ability for an individual to perform 2 tasks simultaneously. The investigators will assess the dual-task performance during walking and performing box and block test. The results of the dual-task tests will provide information regarding to whether the 2 tasks compete for the same class of neural resources or one of the tasks can be carried out automatically

To detect cognitive and functional decline. The ECog shows promise as a useful tool for the measurement of general and domain-specific everyday functions in the elderly. There are six domains (Everyday Memory, Language, Visuospatial Abilities, Planning, Organization, and Divided Attention) in ECog. Lower scores represent a higher level of function in daily life.

The Amsterdam Instrumental Activity of Daily Living (A-IADL) is an adaptive and computerized questionnaire designed to assess impairments in instrumental activities of daily living (IADL) in (early) dementia. The questionnaire is completed by a caregiver, such as a relative or friend.

Each item has a 5-point scale response option (scored 0-4). The scoring of the Amsterdam Instrumental Activity of Daily Living is calculated using item response theory .Lower scores indicating poorer performance.

The World Health Organization Quality of Life-Old questionnaires demonstrate acceptable psychometric performance in a convenience sample of Taiwan older people. It are valuable measures of Quality of Life-Old for use with older people.Time frame for assessment is the past two weeks.

The items are distributed into 4 domains (physical; psychological, social and environmental health) and 25 facets.

The community integration questionnaire (CIQ) was designed to assess home integration, social integration and productive activity in persons with acquired brain injury. The instrument consists of 15 items and can be completed by self report or with the assistance of a family member or caregiver familiar with the person's health status and social activities.

The Geriatric Depression Scale (GDS) - 15 items version is a self-administered questionnaire used to evaluate mood and depressive symptoms. The scores range is 0-15 and a score of 5 or greater taken as a possible indicator of depression.

It comprised eight open-ended questions focusing on the meaning and interpretation of 'subjective well-being', e.g., 'Can you tell me what the important contributors to your well-being are?', 'Can you describe the important elements in your life that make you feel happy?', 'Can you describe the important elements in your life that you dislike?' and 'What does well-being personally mean to you?' To adapt the Aging Well Profile for a Chinese population in Taiwan was secured. It was agreed that the new version would be called the Chinese Aging Well Profile (CAWP).

The Clinical Frailty Scale (CFS) is a judgement-based frailty tool that evaluates specific domains including comorbidity, function, and cognition to generate a frailty score ranging from 1 (very fit) to 9 (terminally ill). The aim of this scoping review is to identify and document the nature and extent of research evidence related to the CFS.

The TUG assesses the dynamic balance ability and mobility. The participants will be required to stand up from a chair, walk 3 meters, turn around, walk back to the chair, and sit down. The time to complete the TUG test has been shown to be a good indicator to detect potential fallers in frail elderly (Podsiadlo \& Richardson, 1991). The test-retest reliability of TUG on individuals with cognitive impairment was excellent (Blankevoort, van Heuvelen, \& Scherder, 2013).

The 30 second sit-to-stand will be assessed to indicate the strength and endurance level of the lower extremities. The 30 second sit-to-stand was standardized to allow hand support during the rise to and descent from standing but required participants to let go of the armrests with each stand. The participants will be asked to stand up from a standardized chair and then sit down as many times as possible within 30 seconds. The feasibility and reliability of using sit-to-stand test in people with cognitive impairment have been established to be good.

The investigator will use hand dynamometer to measure grip strength of both hands while the participant is seated, with the elbow at 90-degree flexion. The investigator will record the mean value of 3 attempts.

Grip strength was measured using a digital dynamometers method, which is a tool with an adjustable grip span, ranging from 3.5 to 7 cm and weighing from 5 to 100 kg with minimal difference around 0.1 kg . All the participants were in a sitting position with fully extended elbows . Then, the investigator measured Grip strength on the dominant hand after 2-3 minutes of resting.

The Short Physical Performance Battery (SPPB) is an objective assessment tool for evaluating lower extremity functioning in older persons. The short physical performance battery (SPPB) is a group of measures that combines the results of the gait speed, chair stand and balance tests . It has been used as a predictive tool for possible disability and can aid in the monitoring of function in older people. The scores range from 0 (worst performance) to 12 (best performance). The SPPB has been shown to have predictive validity showing a gradient of risk for mortality, nursing home admission, and disability.

Reported Edmonton Frail Scale is an adaptation of Edmonton Frail Scale, that can be performed in less than 10 min by any healthcare professional. Reported Edmonton Frail Scale substitutes the last domain on Edmonton Frail Scale, the physical performance measure, with three self-assessed physical performance questions . This is ideal for use in busy cardiology clinics when patients are being assessed for suitability for intervention. Scoring for the Reported Edmonton Frail Scale range is 0 to18. Not Frail：0-5 ;Apparently Vulnerable：6-7; Mildly Frail：8-9;Moderate Frailty：10-11;Sever Frailty：12-18.

As with the standard WHOQOL-BREF questionnaires the WHOQOL-BREF Taiwan version was simplified from the WHOQOL long form for Taiwan. For the purpose of cross-cultural comparison, the first 26 items were the same as the standard WHOQOL-BREF, which was developed from global studies. In addition to the 26 items, we applied the psychometric criteria proposed by the WHOQOL Group to select two more items from each of the two new facets to form the WHOQOL-BREF Taiwan version using data from the same 1,068 subjects. The selection process used for national items is described in the Results section. Thus, the WHOQOL-BREF Taiwan version contains 28 items classified into the same four domains as the standard WHOQOL-BREF. The scale administration and scoring procedures are the same as for the WHOQOL long form except that the facet score is based on only one item.