scholarly journals Feasibility of a mobile feedback system for gait retraining in people with lower limb loss—A technical note

2019 ◽  
Vol 6 ◽  
pp. 205566831881368 ◽  
Author(s):  
Goeran Fiedler ◽  
Krista Kutina
Keyword(s):  
Visual Feedback ◽  
Stance Phase ◽  
Feedback System ◽  
Technical Note ◽  
Gait Retraining ◽  
Gait Symmetry ◽  
Feedback Information ◽  
Training Interventions ◽  
Smart Glasses ◽  
Effectiveness Of Training

Gait retraining in people with musculoskeletal and/or neurological impairments requires sustained dedicated efforts by the patient and the rehabilitation therapist. Various technical approaches have been proposed and utilized to improve the effectiveness of training interventions. Among the most promising approaches is the provision of real-time feedback information to the patient, which has been used with success on treadmill-based interventions in the past. We are describing a mobile visual feedback system that is intended to work in the user’s everyday-life environment. The data are captured by a small mobile load cell, processed in a wearable computer, and displayed to the user via smart-glasses. Preliminary testing of the initially selected feedback variable stance/step ratio (i.e., the duration of a step’s stance phase in relation to the overall step’s duration) confirmed that data quality is sufficient for purposes of generating feedback information and that the chosen variable is responsive to changes in gait symmetry. The presented work may inform future studies and developments on the topic of mobile visual feedback for gait rehabilitation.

scholarly journals Bird’s-Eye View Provided in Real-time via Drone Improves Spatial Perception for Team Sports

2021 ◽  
Author(s):  
Satoshi Miura ◽  
Kento Nakagawa ◽  
Kazumasa Hirooka ◽  
Yuya Matsumoto ◽  
Yumi Umesawa ◽  
...  
Keyword(s):  
Real Time ◽  
Visual Feedback ◽  
Spatial Perception ◽  
Team Sports ◽  
Space Perception ◽  
Feedback System ◽  
Smart Glasses ◽  
Perceptual Abilities ◽  
Individual Sports ◽  
Error Distance

Abstract Sports-assisting technologies have been developed; however, most are to improve performances in individual sports such as ski, batting, and swimming. Few studies focused on team sports which require not only motor ability of individual players but also perceptual abilities to grasp positions of their own and others. In the present study, we aim to validate the feasibility of a visual feedback system for the improvement of space perception in relation to other persons that is necessary. Herein, the visual feedback system is composed of a flying drone that transmits the image to the participant’s smart glasses. With and without the system, the participant was able to see his/her own relative position in real time though the glass. Nine participants tried to position themselves on the line between two experimenters 30 m away from each other, which simulated the situation of a baseball cutoff man. As a result, the error distance between the participants’ position and the line significantly decreased when using the system than that without the system. Furthermore, after participants practiced the task with the system the error decreased compared to that before the practice. In conclusion, the real-time feedback system from the bird’s-eye view would work for improving the accuracy of space perception.

scholarly journals Technical note—auditory feedback of knee angle for amputees

1982 ◽  
Vol 6 (2) ◽  
pp. 103-104 ◽  
Author(s):  
J. A. Gilbert ◽  
G. M. Maxwell ◽  
R. T. George ◽  
J. H. McElhaney
Keyword(s):  
Visual Feedback ◽  
Auditory Feedback ◽  
Feedback System ◽  
Gait Training ◽  
Technical Note ◽  
Training Device ◽  
Knee Angle ◽  
Knee Position

A new gait training device has been developed to provide auditory feedback of knee angle information to above-knee and hip disarticulation amputees. Traditionally, new amputees have relied on visual feedback of knee position during gait training (van Griethuysen, 1979). This auditory feedback system eliminates the need for visual feedback by providing a frequency encoded tone corresponding to knee angle.

Effects of Partial Absence of Visual Feedback Information on Gait Symmetry

2017 ◽  
Vol 42 (2) ◽  
pp. 107-115 ◽  
Author(s):  
Seung-Jae Kim ◽  
Marie Aimee Kayitesi ◽  
Amy Chan ◽  
Kimberli Graham
Keyword(s):  
Visual Feedback ◽  
Gait Symmetry ◽  
Feedback Information

Evaluation of a visual feedback system in gait retraining: A pilot study

2012 ◽  
Vol 36 (2) ◽  
pp. 182-186 ◽  
Author(s):  
Daniel Hamacher ◽  
Dietrich Bertram ◽  
Cassandra Fölsch ◽  
Lutz Schega
Keyword(s):  
Pilot Study ◽  
Visual Feedback ◽  
Feedback System ◽  
Gait Retraining

A Global Gait Asymmetry Index

2016 ◽  
Vol 32 (2) ◽  
pp. 171-177 ◽  
Author(s):  
Silvia Cabral ◽  
Renan A. Resende ◽  
Adam C. Clansey ◽  
Kevin J. Deluzio ◽  
W. Scott Selbie ◽  
...  
Keyword(s):  
Visual Feedback ◽  
Asymmetry Index ◽  
Joint Angles ◽  
Gait Retraining ◽  
Gait Symmetry ◽  
Custom Made ◽  
Gait Asymmetry ◽  
Discrete Measures ◽  
Different Levels

High levels of gait asymmetry are associated with many pathologies. Our long-term goal is to improve gait symmetry through real-time biofeedback of a symmetry index. Symmetry is often reported as a single metric or a collective signature of multiple discrete measures. While this is useful for assessment, incorporating multiple feedback metrics presents too much information for most subjects to use as visual feedback for gait retraining. The aim of this article was to develop a global gait asymmetry (GGA) score that could be used as a biofeedback metric for gait retraining and to test the effectiveness of the GGA for classifying artificially-induced asymmetry. Eighteen participants (11 males; age 26.9 y [SD = 7.7]; height 1.8 m [SD = 0.1]; body mass 72.7 kg [SD = 8.9]) walked on a treadmill in 3 symmetry conditions, induced by wearing custom-made sandals: a symmetric condition (identical sandals) and 2 asymmetric conditions (different sandals). The GGA score was calculated, based on several joint angles, and compared between conditions. Significant differences were found among all conditions (P < .001), meaning that the GGA score is sensitive to different levels of asymmetry, and may be useful for rehabilitation and assessment.

Intermittency in the Control of Continuous Force Production

2000 ◽  
Vol 84 (4) ◽  
pp. 1708-1718 ◽  
Author(s):  
Andrew B. Slifkin ◽  
David E. Vaillancourt ◽  
Karl M. Newell
Keyword(s):  
Visual Feedback ◽  
Visual Information ◽  
Spectral Power ◽  
Force Production ◽  
Motor Output ◽  
Force Variability ◽  
Force Output ◽  
Feedback Information ◽  
Information Processes ◽  
Feedback Frequency

The purpose of the current investigation was to examine the influence of intermittency in visual information processes on intermittency in the control continuous force production. Adult human participants were required to maintain force at, and minimize variability around, a force target over an extended duration (15 s), while the intermittency of on-line visual feedback presentation was varied across conditions. This was accomplished by varying the frequency of successive force-feedback deliveries presented on a video display. As a function of a 128-fold increase in feedback frequency (0.2 to 25.6 Hz), performance quality improved according to hyperbolic functions (e.g., force variability decayed), reaching asymptotic values near the 6.4-Hz feedback frequency level. Thus, the briefest interval over which visual information could be integrated and used to correct errors in motor output was approximately 150 ms. The observed reductions in force variability were correlated with parallel declines in spectral power at about 1 Hz in the frequency profile of force output. In contrast, power at higher frequencies in the force output spectrum were uncorrelated with increases in feedback frequency. Thus, there was a considerable lag between the generation of motor output corrections (1 Hz) and the processing of visual feedback information (6.4 Hz). To reconcile these differences in visual and motor processing times, we proposed a model where error information is accumulated by visual information processes at a maximum frequency of 6.4 per second, and the motor system generates a correction on the basis of the accumulated information at the end of each 1-s interval.

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 Impact Loading During Distracted Running Before and After Auditory Gait Retraining

2018 ◽  
Vol 39 (14) ◽  
pp. 1075-1080 ◽  
Author(s):  
Eric Ching ◽  
Winko An ◽  
Ivan Au ◽  
Janet Zhang ◽  
Zoe Chan ◽  
...  
Keyword(s):  
Visual Feedback ◽  
Impact Loading ◽  
Auditory Feedback ◽  
Loading Rate ◽  
Real Life ◽  
Gait Retraining ◽  
Positive Acceleration ◽  
Before And After ◽  
The Impact ◽  
High Sound

AbstractVisual feedback gait retraining has been reported to successfully reduce impact loading in runners, even when the runners were distracted. However, auditory feedback is more feasible in real life application. Hence, this study compared the peak positive acceleration (PPA), vertical average (VALR) and instantaneous (VILR) loading rate during distracted running before and after a course of auditory feedback gait retraining in 16 runners. The runners were asked to land with softer footfalls with and without auditory feedback. Low or high sound pitch was generated according to the impact of particular footfall, when compared with the preset target. Runners then received a course of auditory gait retraining, and after the gait retraining, runners completed a reassessment. Runners before gait retraining exhibited lower PPA, VALR and VILR with augmented auditory feedback (p<0.049). We found a reduction in PPA, VALR and VILR after gait retraining, regardless of the presence of feedback (p<0.018). However, runners after gait retraining did not demonstrate further reduction in PPA and VALR with auditory feedback (p>0.104). A small effect of auditory feedback on VILR in runners after gait retraining was observed (p=0.032). Real time auditory feedback gait retraining is effective in impact loading reduction, even when the runners were distracted.

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