Memory and Exercise Training Study in Older Adults With Subjective Memory Complaints

Study Overview
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Brief Summary
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This pilot study is a first step in a rapidly growing area of clinical research to create the most effective means to combat age-related losses in cognitive function through preventive lifestyle strategies such as physical exercise and memory training. This study will develop innovative simultaneous exercise and memory training programs in non-demented volunteers with subjective memory complaints (controls or MCI). Our primary goal is to assess the cognitive impact of 4-week memory training programs done twice weekly: 1. during simultaneous aerobic exercise (SIM-AR-MET), 2. sequentially after aerobic exercise (SEQ-AR-MET), or 3. without aerobic exercise (replaced with sequential stretching and toning) (SEQ-ST-MET). The investigators will also measure potential metabolic (e.g., glucose, lipid panel) and molecular (serum BDNF) mediators of observed cognitive changes in a subset of participants (those at the UCLA CTRC/IPCN site).

Detailed Description
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A total of 90 non-demented healthy older adult volunteers (age 60-75) with subjective memory complaints (controls or MCI) will be screened and enrolled into the study. The CTRC/IPCN site will enroll 30 subjects (10 in each group); the MPTF site will enroll 60 subjects (20 in each group). Baseline assessments will include neuropsychological testing of all study subjects. At UCLA CTRC/IPCN, baseline assessments will also include cardiorespiratory fitness, body composition, YMCA fitness tests, and blood-based markers of metabolism and plasticity. To control for total activity levels, all study subjects will wear continuous physical activity monitors (FitBit accelerometers) and keep exercise and cognitive activity logs during the entire study. All subjects (n = 90) will first complete a 1-week observational period to capture baseline activity levels. Subjects will then be randomized to one of three groups: SIM-AR-E&MT, SEQ-AR-E&MT, or SEQ-ST-MET (n = 30 per group). SIM-AR-MET and SEQ-AR-MET subjects will complete a 3-week exercise only 'ramp-up' period consisting of twice weekly 1-hour sessions practicing stationary bicycling, improving cardiovascular fitness enough to complete the upcoming 4-weeks of MET sessions (described below), and practicing stretching and toning; SEQ-ST-MET subjects 3-week exercise only 'ramp-up' period will consist of an equal number of six stretching and toning sessions (no aerobic components). All 3 programs will then have two 2-hour sessions per week for 4 weeks. The SIM-AR-MET and SEQ-ST-MET subjects will do stretching/toning during the first hour; SEQ-AR-MET subjects will do aerobic cycling during the first hour. During the second half of the sessions, all 3 groups will first learn new memory training strategies while sedentary. SIM-AR-MET subjects will then practice the memory techniques while cycling while SEQ-AR-MET and SEQ-ST-MET subjects will practice the memory techniques while still sedentary. The three groups will have group specific exercise and memory training homework assignments, along with monitoring of activity and logging of cognitively enriching activities. The NP testing will be done again at the end of the 4 weeks of memory training classes for all study subjects. UCLA CTRC/IPCN subjects will have the additional testing done at baseline (e.g., blood-based markers, etc.). Consideration was given to having a purely observational 'wait-list' group, but in our experience with this population such groups have typically initiated greater levels of self-guided exercise and memory training in reaction to being put on a wait list. Alternatively, if no increase in activity or memory training is undertaken by wait list subjects, the investigators would not expect any differences in cognitive performance to be measurable within the brief 3 month total time frame of this initial study. The investigators also considered have a group do aerobic exercise immediately after memory training, but based on current literature, this combination seemed the least likely to impact memory synergistically. Thus, these two groups will be deferred for the pilot until later, larger studies can be done to confirm or refute these hypotheses. Similarly, while our primary aim assessing change in NP performance will be tested in all subjects, the pilot nature of the study prohibits testing of secondary aims in both sites. The academic medical center site will leverage the assistance of the UCLA CTRC/IPCN to accomplish preliminary testing of the secondary aims in 30 subjects, while the UCLA MPTF community site will test only the primary study aim of change in NP performance.

Official Title
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Simultaneous Aerobic Exercise and Memory Training in Older Adults With Subjective Memory Complaints

Conditions
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Memory Impairment

Intervention / Treatment
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* Other: simultaneous aerobic exercise
* Other: sequential aerobic exercise
* Other: stretching and toning


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: In good health Have memory problems or complaints Living independently Exclusion Criteria: History of neurodegenerative disease or dementia Major psychiatric conditions Neurological disorders Active alcohol or substance abuse Head trauma or systemic diseases affecting brain function Uncontrolled hypertension or cardiovascular disease

Ages Eligible for Study
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Minimum Age: 60 Years
Maximum Age: 75 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Health Services Research
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Sequential Exercise and Memory Training<br>Aerobic exercise via stationary bicycling followed by memory training. | Other: sequential aerobic exercise<br>* stationary bicycling at 65% of heart rate reserve for 30 minutes followed by memory training.<br>|
| Experimental: Simultaneous Exercise & Memory Training<br>Simultaneous aerobic exercise via stationary bicycling while receiving memory training. | Other: simultaneous aerobic exercise<br>* stationary bicycling at 65% of heart rate reserve for 30 minutes while receiving memory training.<br>|
| Placebo Comparator: Stretching and Toning<br>Anerobic stretching and toning followed by memory training | Other: stretching and toning<br>* anaerobic stretching and toning followed by memory training.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Effects of the MET interventions on cognition (comparing baseline vs. end-of-study NP testing) | Change from baseline in composite measure of memory related tasks including retention, attention, and mood. | up to 9 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Changes in BDNF levels in response to the interventions | Increase of baseline measurement for BDNF levels. | up to 9 months | 
| Physical health measures | Change in baseline in composite measurement of weight (loss), and increase in physical activity. | up to 9 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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(An)aerobic exercise, memory training, cognitive benefits