Please select the eligibility criteria that correspond to the clinical trial below.
Title: Study of Community Based Dual Task and Aerobic Exercise Intervention on Cognition and Mobility in Older Adults Without Dementia
Brief Summary: The investigators proposed research will establish whether combining aerobic exercise with cognitive challenges is feasible and effective in community dwelling older adults with early signs of cognitive impairment.


Options:
A: Inclusion Criteria:

1. Age of 65 years or older
2. Living at home
3. Able to walk without personal assistance and no other physical limitations that can limit participation and adherence, particularly to exercise intervention programme
4. Meet criteria for frailty

Operational definition of frailty.

The participants are assessed and classified on the level of frailty by the following measures and criteria:

1. Weight loss
2. Slowness
3. Poor balance and weakness assessed by chair stand test
4. Muscle weakness assessed by hand grip and knee extension strength
5. Exhaustion, fatigue or low endurance
6. Low physical activity

Exclusion Criteria:

1. Member of household already enrolled
2. Dementia or cognitive impairment, major depression or other psychotic disorders
3. Severe audio-visual impairment
4. Progressive, degenerative neurologic disease like Parkinsonism, fits/ epilepsy, etc
5. Rapidly progressive or terminal illness under palliative care with life expectancy less than 12 months
6. History of alcohol abuse or any other substance abuse
7. Severely affect muscle/joint dysfunction resulting in disability
8. Hospital admission in the past 3 months
9. Regular physical training or physiotherapy or current participation in a vigorous exercise or weight-training program more than once per week
10. Undergoing therapeutic diet incompatible with nutritional supplementation
11. In the opinion of research clinician, the intervention is deemed to be potentially hazardous for the subject, such as serious cardiac and pulmonary disease.
B: Inclusion Criteria:

* Age \> 64
* Self-report of recent decline in memory or thinking
* Low/no physical activity (\<2 days/week for \<30 minutes/session of moderate intensity activity over past 3 months)
* Low/no computer mental activity (\<2 days/week for \<30 minutes/session over past 3 months)
* Fluent in English
* Willingness to perform study activities

Exclusion Criteria:

* Evidence of dementia (based on self-report, physician diagnosis or score \< 19 on Telephone Interview for Cognitive Status)
* Significant central nervous system disorder (Parkinson's disease, multiple sclerosis, ALS \[Lou Gerig's disease\])
* Major, current psychiatric disorder (major depressive disorder, schizophrenia, bipolar disorder, post-traumatic stress disorder, obsessive-compulsive disorder, psychiatric hospitalization in past 20 years)
* Major central nervous system event (stroke, transient ischemic attack/mini-stroke, seizure, or traumatic brain injury that has left a residual deficit)
* Significant heart disease (severe congestive heart failure, severe aortic stenosis, cardiac arrest, uncontrolled angina)
* Significant lung disease (requiring supplemental oxygen or oral or injected steroids)
* Other condition that would make participation potentially dangerous (cancer requiring treatment in past 3 years, severe arthritis, history of cardiac defibrillation, dialysis)
* Lack of physician approval
* Severe hearing or visual impairment
* History of learning disability
* Starting prescription medication to enhance cognitive function (e.g., memantine, aricept)
* Dependent in any basic activity of daily living (eating, dressing, bathing, toileting, getting out of bed/chair)
* History of alcohol abuse/heavy alcohol use
* History of drug abuse/heavy drug use
* Currently enrolled in another research study
* Fibromyalgia or tremor severe enough to prevent use of a computer mouse
* Planning to travel \> 4 exercise class days during study period
* Behaviors during screening or baseline visit that, in the judgement of research staff, are likely to present significant problems (e.g., uncooperative, anger, inappropriate physical contact)
* Unable to perform neuropsychological evaluations
* Unable to complete consent process
C: Inclusion Criteria:

1. able to follow instruction,
2. clinical dementia rating (CDR) = 0.5 or 1,
3. self- or informant-reported memory or cognitive complaint, and
4. able to perform activities of daily living (Barthel Index ≥ 70).

Exclusion Criteria:

1. recent myocardial infarction,
2. heart failure,
3. recent heart surgery,
4. severe asthma,
5. concomitant with other neurological disorders, or
6. joint deformity that might prevents them performing exercise or cognitive training.
D: Inclusion Criteria:

* Male/Female 55-90 years old.
* Montreal Cognitive Assessment score ≤27
* Preserved Instrumental Activities of Daily Living (based on Lawton-Brody Instrumental Activities of Daily Living Sale)

Exclusion Criteria:

* Dementia (i.e., Mini-Mental Examination score \<24 or self-reported physician diagnosis)
* Major Depression (\>=16 on the Center for Epidemiologic Studies - Depression Scale combined with clinical judgment by primary study physician)
* Other neurological or psychiatric disorders
* Recent history of severe cardiovascular conditions
* Significant orthopedic conditions
* Have blood pressure \>180/100 mmHg or \<100/60 mmHg
* Unable to comprehend questionnaire material/study procedures

Answer: D