scholarly journals Influence of visual feedback on dynamic balance control in chronic stroke survivors

2016 ◽  
Vol 49 (5) ◽  
pp. 698-703 ◽  
Author(s):  
Eric R. Walker ◽  
Allison S. Hyngstrom ◽  
Brian D. Schmit
Keyword(s):  
Visual Feedback ◽  
Balance Control ◽  
Dynamic Balance ◽  
Chronic Stroke ◽  
Stroke Survivors

scholarly journals Investigating the feasibility and acceptability of real-time visual feedback in reducing compensatory motions during self-administered stroke rehabilitation exercises: A pilot study with chronic stroke survivors

2019 ◽  
Vol 6 ◽  
pp. 205566831983163 ◽  
Author(s):  
Shayne Lin ◽  
Jotvarinder Mann ◽  
Avril Mansfield ◽  
Rosalie H Wang ◽  
Jocelyn E Harris ◽  
...  
Keyword(s):  
Pilot Study ◽  
Upper Extremity ◽  
Visual Feedback ◽  
Feedback System ◽  
Optimal Recovery ◽  
Chronic Stroke ◽  
Stroke Survivors ◽  
Perfect Agreement ◽  
Rehabilitation Programs ◽  
Shoulder Elevation

Introduction Homework-based rehabilitation programs can help stroke survivors restore upper extremity function. However, compensatory motions can develop without therapist supervision, leading to sub-optimal recovery. We developed a visual feedback system using a live video feed or an avatar reflecting users' movements so users are aware of compensations. This pilot study aimed to evaluate validity (how well the avatar characterizes different types of compensations) and acceptability of the system. Methods Ten participants with chronic stroke performed upper-extremity exercises under three feedback conditions: none, video, and avatar. Validity was evaluated by comparing agreement on compensations annotated using video and avatar images. A usability survey was administered to participants after the experiment to obtain information on acceptability. Results There was substantial agreement between video and avatar images for shoulder elevation and hip extension (Cohen's κ: 0.6–0.8) and almost perfect agreement for trunk rotation and flexion (κ: 0.80–1). Acceptability was low due to lack of corrective prompts and occasional noise with the avatar display. Most participants suggested that an automatic compensation detection feature with visual and auditory cuing would improve the system. Conclusion The avatar characterized four types of compensations well. Future work will involve increasing sensitivity for shoulder elevation and implementing a method to detect compensations.

scholarly journals Cortical reorganization to improve dynamic balance control with error amplification feedback

2022 ◽  
Vol 19 (1) ◽  
Author(s):  
Yi-Ching Chen ◽  
Yi-Ying Tsai ◽  
Gwo-Ching Chang ◽  
Ing-Shiou Hwang
Keyword(s):  
Visual Feedback ◽  
Neural Control ◽  
Balance Control ◽  
Dynamic Balance ◽  
Cortical Reorganization ◽  
Phase Lag ◽  
Behavioral Strategies ◽  
Beta Band ◽  
Error Amplification ◽  
The Right

Abstract Background Error amplification (EA), virtually magnify task errors in visual feedback, is a potential neurocognitive approach to facilitate motor performance. With regional activities and inter-regional connectivity of electroencephalography (EEG), this study investigated underlying cortical mechanisms associated with improvement of postural balance using EA. Methods Eighteen healthy young participants maintained postural stability on a stabilometer, guided by two visual feedbacks (error amplification (EA) vs. real error (RE)), while stabilometer plate movement and scalp EEG were recorded. Plate dynamics, including root mean square (RMS), sample entropy (SampEn), and mean frequency (MF) were used to characterize behavioral strategies. Regional cortical activity and inter-regional connectivity of EEG sub-bands were characterized to infer neural control with relative power and phase-lag index (PLI), respectively. Results In contrast to RE, EA magnified the errors in the visual feedback to twice its size during stabilometer stance. The results showed that EA led to smaller RMS of postural fluctuations with greater SampEn and MF than RE did. Compared with RE, EA altered cortical organizations with greater regional powers in the mid-frontal cluster (theta, 4–7 Hz), occipital cluster (alpha, 8–12 Hz), and left temporal cluster (beta, 13–35 Hz). In terms of the phase-lag index of EEG between electrode pairs, EA significantly reduced long-range prefrontal-parietal and prefrontal-occipital connectivity of the alpha/beta bands, and the right tempo-parietal connectivity of the theta/alpha bands. Alternatively, EA augmented the fronto-centro-parietal connectivity of the theta/alpha bands, along with the right temporo-frontal and temporo-parietal connectivity of the beta band. Conclusion EA alters postural strategies to improve stance stability on a stabilometer with visual feedback, attributable to enhanced error processing and attentional release for target localization. This study provides supporting neural correlates for the use of virtual reality with EA during balance training.

scholarly journals Effects of Body Weight Support-Tai Chi Footwork Training on Balance Control and Walking Function in Stroke Survivors with Hemiplegia: A Pilot Randomized Controlled Trial

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Xiao-Ming Yu ◽  
Xue-Ming Jin ◽  
Yan Lu ◽  
Yang Gao ◽  
Hai-Chen Xu ◽  
...  
Keyword(s):  
Body Weight ◽  
Range Of Motion ◽  
Tai Chi ◽  
Balance Control ◽  
Dynamic Balance ◽  
Body Weight Support ◽  
Control Group ◽  
Stroke Survivors ◽  
Limits Of Stability ◽  
Weight Support

Background. Tai Chi (TC) is known to enhance balance control and walking function in stroke survivors. However, motor disorders in stroke patients may limit the implementation of TC exercise and increase the risk of falling. The body weight support (BWS) device can provide protection during the early rehabilitation of stroke survivors using an overhead suspension system. Theoretically, combining TC with BWS may be an effective intervention for stroke survivors. This study aimed to examine the effects of body weight support-Tai Chi training on balance control and walking function in stroke survivors with hemiplegia. Methods. Seventy-one stroke survivors with hemiplegia aged 30–75 years were randomly allocated to the control group (N = 35) or the BWS-TC group (N = 36). During BWS-TC training, the subjects performed 7 Tai Chi footwork forms, and gradual easy-to-difficult progression (from 40% to 0% body weight) was followed. The subjects participated in 40 min rehabilitation sessions three times per week for 12 weeks. The primary outcome was dynamic balance in the limits-of-stability test. The secondary outcomes, which reflect improvements walking function, included spatiotemporal parameters, the joint range of motion in the affected limb during the swing phase, the Berg Balance Scale score, and the Fugl-Meyer Assessment score. Evaluations were performed at baseline and 12 weeks and compared between groups. Results. After training, significant between-group differences were observed in the scores for overall, forward, left, right, forward-left, and forward-right directional control in the limits-of-stability test ( P < 0.05 ). Furthermore, the scores for gait cycle time, step length, step velocity, and range of motion of the joints were better in the BWS-TC group than in the control group ( P < 0.05 ). Conclusions. The 12-week BWS-TC training may enhance dynamic balance and walking function in stroke survivors with hemiplegia.

scholarly journals Effect of visual feedback on the performance of the star excursion balance test

2019 ◽  
Vol 6 ◽  
pp. 205566831986213 ◽  
Author(s):  
Yi Wan ◽  
Jennifer L Davies ◽  
Kate Button ◽  
Mohammad Al-Amri
Keyword(s):  
Real Time ◽  
Visual Feedback ◽  
Balance Control ◽  
Dynamic Balance ◽  
Effective Means ◽  
Video Camera ◽  
Balance Test ◽  
Promising Tool ◽  
Star Excursion Balance Test ◽  
Healthy Participants

Introduction Visual feedback is an effective method to enhance postural and balance control in clinical and sports training. The aim of this study was to explore the effect of real-time visual feedback provided by a video camera on the performance of a dynamic balance test, which is the star excursion balance test in healthy subjects. Methods We compared the performance of the star excursion balance test using the maximum reach distance in 20 healthy participants (10 male and 10 female, 26.8 ± 3.7 years) under two conditions: without feedback and whilst they viewed their movements in real-time on a screen in front of them via a video camera. Results The results showed that real-time visual feedback had a significant effect on maximum reach distance of the star excursion balance test in the posterolateral direction (P < 0.001). There was a non-significant increase in the maximum reach distance in the anterior and posteromedial directions. Conclusion The result indicates that the real-time visual feedback appears to be an effective means for improving the performance of the star excursion balance test in the posterolateral direction, and may be a promising tool for clinical rehabilitation and athlete training to enhance dynamic postural control.

scholarly journals Kinect-based rapid movement training to improve balance recovery for stroke fall prevention: a randomized controlled trial

2021 ◽  
Vol 18 (1) ◽  
Author(s):  
Melisa Junata ◽  
Kenneth Chik-Chi Cheng ◽  
Hok Sum Man ◽  
Charles Wai-Kin Lai ◽  
Yannie Oi-Yan Soo ◽  
...  
Keyword(s):  
Randomized Controlled Trial ◽  
Balance Control ◽  
Controlled Trial ◽  
Balance Training ◽  
Chronic Stroke ◽  
Stroke Survivors ◽  
Balance Recovery ◽  
Rapid Movement ◽  
Randomized Controlled ◽  
Movement Training

Abstract Background Falls are more prevalent in stroke survivors than age-matched healthy older adults because of their functional impairment. Rapid balance recovery reaction with adequate range-of-motion and fast response and movement time are crucial to minimize fall risk and prevent serious injurious falls when postural disturbances occur. A Kinect-based Rapid Movement Training (RMT) program was developed to provide real-time feedback to promote faster and larger arm reaching and leg stepping distances toward targets in 22 different directions. Objective To evaluate the effectiveness of the interactive RMT and Conventional Balance Training (CBT) on chronic stroke survivors’ overall balance and balance recovery reaction. Methods In this assessor-blinded randomized controlled trial, chronic stroke survivors were randomized to receive twenty training sessions (60-min each) of either RMT or CBT. Pre- and post-training assessments included clinical tests, as well as kinematic measurements and electromyography during simulated forward fall through a “lean-and-release” perturbation system. Results Thirty participants were recruited (RMT = 16, CBT = 14). RMT led to significant improvement in balance control (Berg Balance Scale: pre = 49.13, post = 52.75; P = .001), gait control (Timed-Up-and-Go Test: pre = 14.66 s, post = 12.62 s; P = .011), and motor functions (Fugl-Meyer Assessment of Motor Recovery: pre = 60.63, post = 65.19; P = .015), which matched the effectiveness of CBT. Both groups preferred to use their non-paretic leg to take the initial step to restore stability, and their stepping leg’s rectus femoris reacted significantly faster post-training (P = .036). Conclusion The RMT was as effective as conventional balance training to provide beneficial effects on chronic stroke survivors’ overall balance, motor function and improving balance recovery with faster muscle response. Trial registration: The study was registered at Clinicaltrials.gov (https://clinicaltrials.gov/ct2/show/NCT03183635, NCT03183635) on 12 June 2017.

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