Older adults often display gait instability, impaired balance control and cognitive decline that lead to falls and fall risks. Approximately 60% of the elderly people with cognitive deficits experience a detrimental fall each year. Such motor and cognitive impairments further decreases physical activity levels in this population leading to restricted community integration, social behavior, depression and long-term disability. With the help of computer technology, studies have employed virtual-reality based interventions to address the above-mentioned concerns including sensori-motor, balance control and cognitive impairments. Previous studies have demonstrated promising results on improving the behavioral outcomes, and have identified such interventions have the potential to improve the underlying neurophysiological outcomes as well. While VR based training studies have demonstrated remarkable improvement in the balance control and gait parameters, physical activity levels and fall risk reduction, the gains on cognitive function is less pronounced. There is little evidence that VR-based training can explicitly address the higher executive cognitive domains associated with balance control and falls. Further, the effect of VR-based training on balance control and cognitive function is unknown among the older adults with mild cognitive impairment. Therefore, to address the cognitive domains explicitly, the current study aims to test the applicability of Wii-Fit Nintendo along with an additional cognitive load delivered via VR-based cognitive-motor training paradigm (VR-CogMoBal) in older adults with mild cognitive impairment. Lastly, the study also aims to identify the effect of such training on the underlying behavioral and neural outcomes. The behavioral outcomes will be assessed via performance on dual-tasking and clinical measures in the laboratory. The underlying neural outcomes will be assessed via fMRI outcomes. In order to determine the generalizing training effect at community level, a pilot sub-study to determine the physical activity levels post 4 weeks of training will also be conducted.
Older adults suffer from mild cognitive impairments with a prevalence rate of 3% to 22% and an incidence rate of 1% to 6% per year in the United States. Along with age associated locomotor-balance impairments, such cognitive decline among the elderly is known to increase the risk of falls, reduced physical activity and community integration, thus contributing to long-term disability. Daily living activities comprises of several concurrent motor and cognitive performances (dual-tasking) such as shopping in a supermarket, that requires higher executive cognitive functions and intact locomotor-balance control abilities. Falls during dual-tasking occur mostly due to the interference caused, i.e. during dual-task performances, either one or both task (motor or cognitive) performance is deteriorated that is known as cognitive-motor interference. Given that dual-task performances decline due to age-associated factors, daily living activities are highly challenging and difficult to perform for older adults with mild cognitive impairment. Although there are several conventional methods that incorporate locomotor-balance training, the nature of such interventions does not result in pronounced cognitive gains. Additionally, these interventions lack multi-sensory feedback, and due to the monotonous and repeated task practice of exercises characteristic, individuals do not seem to adhere to therapy leading to less compliance and decreased motivation to exercise training. In order to overcome such barriers, alternate form of therapy with the help of Virtual-reality devices, especially off the shelf commercially available exercise platforms emerged for training purposes. Although there is evidence that VR based training improves locomotor-balance control and is known to implicitly address cognitive functions, there is no knowledge that such VR based training can explicitly address higher executive cognitive functions. Therefore, based on preliminary studies tested the efficacy of cognitive training along with exergaming delivered via the commercially available off the shelf device- Wii-fit Nintendo and demonstrated promising results in improving balance control and cognitive function among the individuals with Chronic Stroke. The study resulted in decreased cognitive-motor interference during dual-task performance thereby exhibiting an improved performance on both cognitive and balance control function. Currently, there is lack of knowledge in determining specific interventions for improving dual-task performances among the older adults with MCI. Given that mild cognitive impaired older adults suffer from both motor and cognitive impairments, there is a need for testing the feasibility of a similar intervention among them and determine the change in the underlying neural biomarkers. Aim 1: The study is designed to test the feasibility (tolerability, compliance and effectiveness) of VR-CogMoBal training to improve physical function and reduce fall-risk in community-dwelling older adults with mild cognitive deficits by lowering cognitive-motor interference and dual task costs. Hypothesis: Participants will tolerate the training paradigm and will demonstrate significant improvements in balance, gait, cardiovascular and cognitive performance under dual-task conditions. Aim 2: To examine if the (VR-CogMoBal) will lead to higher cognitive function post-intervention. Hypothesis: Post-training compared to pre-training participants will show significantly greater global cognitive function, executive and working memory and decreased cognitive-motor load. Aim 3: To examine effect of VR-CogMoBal Training on changes in structural and functional connectivity within the cognitive-motor areas in the brain. Hypothesis: Post-training compared to pre-training, participants will show increased structural and functional connectivity at rest in the default mode network (memory consolidation, self-referential memory), fronto-parietal and supplementary motor areas (motor planning and execution, attention). Pilot Sub-study aim: The study aims to monitor the change in the number of steps taken a day before undergoing VR training and 4 weeks post-training.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
TREATMENT
Masking
NONE
Enrollment
27
The participant will play four of the six balance board games Table tilt, Tightrope, Soccer, Balance bubble, Light Run and Basic Step (each game is max 1.5 minutes). Each game will be superimposed with any 3 of the 6 cognitive tasks (word list generation consisting of verbal fluency (VF) and category fluency (CF), digit recall (DR), analogies (AN), mental arithmetic (MA), repeated letter (RL). The cognitive tasks will be randomized making sure that all the cognitive tasks are played with all the games. The cognitive and balance board game scores will be noted on the scoring sheet for each session. A total 10 minutes rest interval between every sub-session will be mandatorily provided.
University of Illinois at Chicago
Chicago, Illinois, United States
Change in Maximum Excursion
It is the actual magnitude of a self-initiated movement (i.e., how far did he/she actually reach a target) without taking a step or losing balance measured in percentage under single and dual-task conditions. Higher values indicate better performance.
Time frame: Baseline (Week 0) and Immediate Post-training (Week 5)
Change in 4 Meter Walk Test
The total time taken to complete the 4 meters will be noted. Speed will then be determined by using the formula distance (4 meters) covered by time taken to complete the test. Higher speed indicate better performance.
Time frame: Baseline (Week 0) and Immediate Post-training (Week 5)
Change of Accuracy in Letter Number Sequencing
This is an oral trail making test which includes listing alternate letter and number from the cue given in sequence. This test will be performed under single and dual-task conditions. For the auditory clock test, the participant is provided with cues that include different times of the day (e.g., 3.15) and the participant has to answer a yes if the hour and the minute hand of the clock are on the same side and no if the hour and minute hand are on opposite side of the clock. For the letter number sequencing test, the participant will be provided sets of letters and numbers (e.g.., A1) and will be asked to list in sequence the consecutive letter and numbers (e.g., B2, C3, D4, E5) until the next cue is provided. The performance will be measured in terms of accuracy (number of correct responses out of the total responses) for both the tests. Higher accuracy i.e., higher percentage indicates better performance.
Time frame: Baseline (Week 0) and Immediate Post-training (Week 5)
Change in Working Memory
List Sorting Memory test to evaluate working memory. This test requires the participant to recall and sequentially list the visually and orally presented stimuli. The accuracy of the participants response is computer generated. Higher value indicate better performance. The total possible responses are 28.
Time frame: Baseline (Week 0) and Immediate Post-training (Week 5)
Change in Episodic Memory
Picture sequence memory test will assess episodic memory of the individual. The number of adjacent pairs of pictures placed correctly will score a point. The scores are computer generated. Higher value indicate better performance.
Time frame: Baseline (Week 0) and Immediate Post-training (Week 5)
Change in Accuracy of Flanker Inhibitory Control and Attention Test
Flanker inhibitory control and attention test is used to evaluate the participants ability to inhibit the attention to the stimulus flanking it and focus on a particular stimulus. Accuracy of the responses are recorded and the scores are computer generated. Higher value indicate better performance.
Time frame: Baseline (Week 0) and Immediate Post-training (Week 5)
Change in Cognitive Flexibility and Attention
Dimensional Change card sort assesses cognitive flexibility and attention. Participants are asked to match a series of bivalent pictures either by colors or shapes accordingly. Responses are computer recorded and accuracy scores are computer generated. Higher value indicate better performance.
Time frame: Baseline (Week 0) and Immediate Post-training (Week 5)
Change in Processing Speed
Pattern comparison processing speed test is used to evaluate the processing speed. The participants are expected to respond whether the two pictures side-by side are same or not the same. Accuracy will be recorded by the number of correct responses out of the total questions in 90 seconds. Scores are computer generated. Higher value indicate better performance.
Time frame: Baseline (Week 0) and Immediate Post-training (Week 5)
Change in Movement Velocity
It is the average speed of center of gravity movement during intentional movement measured in degrees per second under single and dual-task conditions. Higher values indicate better performance.
Time frame: Baseline (Week 0) and Immediate post-training (Week 5)
Changes in End Point Excursion
It is the magnitude of a self-initiated movement (i.e., how far he/she wills to reach a target) without taking a step or losing balance measured in percentage under single and dual-task conditions. Higher values indicate better performance.
Time frame: Baseline (Week 0) and post-training (Week 5)
Change in Directional Control
It is the quality of a self-initiated movement (i.e., amount of movement actually exhibited towards the target to the amount of extraneous movement away from the target) measured in percentage under single and dual-task conditions. Higher values indicate better performance.
Time frame: Baseline (Week 0) and Post-training (Week 5)
Change in Postural Stability During Reactive Balance Control (Single and Dual-task)
Reactive balance control will be examined via the stance perturbation test under single and dual-task conditions (simultaneous performance of Letter number sequencing task or auditory stroop task). Postural stability can be defined as simultaneous control of center of mass (COM) position and velocity during slip-like or trip like perturbation relative to the rear edge of base of support (rear heel). The position is normalized with the individual's foot length, and velocity by square root of gravitational acceleration and individual's body height. Larger values indicate greater stability.
Time frame: Baseline (Week 0) and Post-training (Week 5)
Change in Accuracy of Auditory Stroop
This test involves responding to the pitch (high or low) of the words "High" or "Low". This test will be performed under single and dual-task conditions. Accuracy (number of correct responses out of the total responses) of Auditory stroop will be calculated. Higher accuracy indicates better performance. Higher values indicate better performance.
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Time frame: Baseline (Week 0) and post-training (Week 5)
Change in Dual-task Cost
Dual-task motor and cognitive cost will be calculated using the formula- \[(Dual-task performance- Single Task performance)/Single task performance\*100\]. This will be calculated for dual-task performance during intentional postural sway, reactive balance control and gait conditions. Lower cost indicates better performance.
Time frame: Baseline (Week 0) and Post-training (Week 5)
Change in Gait Parameters
Spatial and temporal gait parameters like step length, cadence and stride length will be determined during single and dual-task walking performance via the GaitRite mat. Higher values for step length and stride length, and lower cadence indicates better performance.
Time frame: Baseline (Week 0) and post-training (Week 5)
Change in Interference in the Reaction Time
Interference in the reaction time via visual stroop task where the individual is expected to respond to the color in which the word is printed and not read the word. Performance will be identified via time taken to complete the test. Lower time indicates better performance.
Time frame: Baseline (Week 0) and Post-training (Week 5)
Change in Language Fluency
Language fluency via verbal and category task will be administered. Performance will be identified via the total number of appropriate words responded on each of the task. Higher values indicate better performance.
Time frame: Baseline (Week 0) and Post-training (Week 5)
Change in Interference in Reaction Time
The individual is asked to hit a key on the number keypad when a cue appears on the screen. Performance will be identified with time taken to hit the key after the individual sees the cue in seconds. Lower time indicates better performance.
Time frame: Baseline (Week 0) and Post-training (Week 5)
Change in Paired Associative Learning
Paired associated learning via grid task will be administered. Accuracy (number of correct responses out of the total responses) will be represented in percentage. Higher value indicates better performance.
Time frame: Baseline (Week 0) and Post-training (Week 5)
Change in Spatial Working Memory
List Sorting Memory test to evaluate working memory. This test requires the participant to recall and sequentially list the visually and orally presented stimuli. The accuracy of the participant's response is computer generated. Higher value indicates better performance. The minimum score is 0% and maximum score is 100%
Time frame: Baseline (Week 0) and Post-training (Week 5)
Change in Reaction Time
The individual is asked to hit a key on the number keypad when a cue appears on the screen. Performance will be identified with time taken to hit the key after the individual sees the cue in seconds. Lower time indicates better performance.
Time frame: Baseline (Week 0) and Post-training (Week 5)
Changes in Fractional Anisotropy
Fractional anisotropy (FA) is a scalar measure derived from diffusion tensor imaging (DTI) that quantifies the directional dependence of water molecule diffusion in biological tissues. Ranging from 0 (completely isotropic diffusion, as in cerebrospinal fluid) to 1 (fully anisotropic diffusion, seen in highly organized white matter tracts), FA reflects microstructural properties such as axonal density, myelination, and fiber coherence. Higher values indicate better integrity of white matter tracts
Time frame: Baseline (Week 0) and Post-training (Week 4)
Berg Balance Scale
The Berg Balance Scale (BBS) is a standardized clinical assessment tool designed to evaluate static and dynamic balance abilities, primarily in older adults and individuals with neurological conditions. The scale score ranges form a minimum of 0 to a maximum of 56, with higher scores indicating better balance performance
Time frame: Baseline (Week 0) and Post-training (Week 5)
Change in Physical Activity Level (Questionnaires)
The Physical Activity Scale for the Elderly (PASE) is a validated self-report questionnaire designed to quantify physical activity levels in adults aged 65+ through occupational, household, and leisure activities over a 7-day period. The scores ranges from 0-793 with higher score indicating better performance.
Time frame: Baseline (Week 0) and Post-training (Week 5)