Pub Date : 2019-07-01DOI: 10.1109/ICVR46560.2019.8994561
Iakovos (Jacob) Kritikos, Anxhelino Mehmeti, G. Nikolaou, D. Koutsouris
To date, technologically-based rehabilitation methods have been widely used for treating disabilities. The evolution of new technologies utilizing motion capture systems or wearable tracking sensors have further enhanced the standalone self-treatments which benefit both the patients and the physicians. However, current systems have not yet proved to be truly mobile or low-cost, since they do not only need significant processing power to operate or tech-savvy operators, but they also have patients visiting the clinic regularly, more often than expected for a home-based system, in order to receive feedback on their performance. This study presents and proposes a fully portable, low-cost motion capture system that supervises the progress of patients whilst each exercise is being executed; thereby, it provides physicians a more mathematically precise way of evaluating patients’ performance and progress through reports generated by the mobile application. For the purposes of this study, we conducted two separate experiments: one regarding accuracy and another one regarding the efficacy of the system.
{"title":"Fully portable low-cost motion capture system with real-time feedback for rehabilitation treatment","authors":"Iakovos (Jacob) Kritikos, Anxhelino Mehmeti, G. Nikolaou, D. Koutsouris","doi":"10.1109/ICVR46560.2019.8994561","DOIUrl":"https://doi.org/10.1109/ICVR46560.2019.8994561","url":null,"abstract":"To date, technologically-based rehabilitation methods have been widely used for treating disabilities. The evolution of new technologies utilizing motion capture systems or wearable tracking sensors have further enhanced the standalone self-treatments which benefit both the patients and the physicians. However, current systems have not yet proved to be truly mobile or low-cost, since they do not only need significant processing power to operate or tech-savvy operators, but they also have patients visiting the clinic regularly, more often than expected for a home-based system, in order to receive feedback on their performance. This study presents and proposes a fully portable, low-cost motion capture system that supervises the progress of patients whilst each exercise is being executed; thereby, it provides physicians a more mathematically precise way of evaluating patients’ performance and progress through reports generated by the mobile application. For the purposes of this study, we conducted two separate experiments: one regarding accuracy and another one regarding the efficacy of the system.","PeriodicalId":179905,"journal":{"name":"2019 International Conference on Virtual Rehabilitation (ICVR)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133687356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.1109/ICVR46560.2019.8994337
D. Green, Shana. Boltin, Aimee Ward, Francesca Gowing, B. Hutchon
Co-production is essential to ensure patient needs are identified, outcomes met and implementation achieved. A modified Delphi approach involving key stakeholders was used to: identify and prioritise outcomes of importance in relation to Virtual Reality (VR) technology design in order to address clinical issues; define outcome measures/develop bespoke project measures; and determine clinical trial design. Results reflect three key themes of motivation for system design and evaluation: autonomy, relatedness and competence. Young people with disabilities and their families have invaluable contributions to the design and implementation of VR technologies in rehabilitation.
{"title":"Coproducing Virtual Reality Technologies for Rehabilitation","authors":"D. Green, Shana. Boltin, Aimee Ward, Francesca Gowing, B. Hutchon","doi":"10.1109/ICVR46560.2019.8994337","DOIUrl":"https://doi.org/10.1109/ICVR46560.2019.8994337","url":null,"abstract":"Co-production is essential to ensure patient needs are identified, outcomes met and implementation achieved. A modified Delphi approach involving key stakeholders was used to: identify and prioritise outcomes of importance in relation to Virtual Reality (VR) technology design in order to address clinical issues; define outcome measures/develop bespoke project measures; and determine clinical trial design. Results reflect three key themes of motivation for system design and evaluation: autonomy, relatedness and competence. Young people with disabilities and their families have invaluable contributions to the design and implementation of VR technologies in rehabilitation.","PeriodicalId":179905,"journal":{"name":"2019 International Conference on Virtual Rehabilitation (ICVR)","volume":"516 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133271161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.1109/ICVR46560.2019.8994546
Adrián Borrego, J. Latorre, M. Alcañiz, R. Lloréns
The electrodermal activity has been used in research as a physiological measure of the activity of the autonomic nervous system when patients face emotional stimuli. Laboratory-grade systems that register the galvanic skin response include sensors that are wired to expensive amplifiers, which can limit its portability and accessibility for non-research centers. In the last years, different devices, mostly wireless wristbands, have come into the market at lower prices. While their portability and lower cost are interesting features for virtual reality applications, their reliability still remains unclear. The objective of this study was to determine the reliability of a wireless wristband, the Empatica E4, to register changes in the galvanic skin response when facing emotionally-valenced images in comparison to a laboratory-grade system. Our data showed that correlation between both systems were low to moderate for negative and positive-valenced images, and non-existent for neutral images. These results suggest that the E4 should be used with caution when assessing changes in emotionally-valenced images and should be avoided for neutral images.
{"title":"Reliability of the Empatica E4 wristband to measure electrodermal activity to emotional stimuli","authors":"Adrián Borrego, J. Latorre, M. Alcañiz, R. Lloréns","doi":"10.1109/ICVR46560.2019.8994546","DOIUrl":"https://doi.org/10.1109/ICVR46560.2019.8994546","url":null,"abstract":"The electrodermal activity has been used in research as a physiological measure of the activity of the autonomic nervous system when patients face emotional stimuli. Laboratory-grade systems that register the galvanic skin response include sensors that are wired to expensive amplifiers, which can limit its portability and accessibility for non-research centers. In the last years, different devices, mostly wireless wristbands, have come into the market at lower prices. While their portability and lower cost are interesting features for virtual reality applications, their reliability still remains unclear. The objective of this study was to determine the reliability of a wireless wristband, the Empatica E4, to register changes in the galvanic skin response when facing emotionally-valenced images in comparison to a laboratory-grade system. Our data showed that correlation between both systems were low to moderate for negative and positive-valenced images, and non-existent for neutral images. These results suggest that the E4 should be used with caution when assessing changes in emotionally-valenced images and should be avoided for neutral images.","PeriodicalId":179905,"journal":{"name":"2019 International Conference on Virtual Rehabilitation (ICVR)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132574117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.1109/ICVR46560.2019.8994545
Patrice L. (Tamar) Weiss, D. Raban, Dorit Geifman, E. Keshner
The application of virtual reality (VR) to rehabilitation is a relatively young, interdisciplinary field where clinical implementation very rapidly follows scientific discovery and technological advancement. Recently, computational tools in the area of data and information science have provided researchers with an ability to examine trends in their field. These tools have been used in all areas of science, from the humanities and social sciences to the health and biological sciences. The objective of the current paper is to study patterns of academic publications in the VR-based rehabilitation literature over the past 22 years. We conclude that exploring the distribution of topics and journals in the field of VR-based rehabilitation reveals a science that is evolving from one with a predominantly technology development focus, to one that focuses on how technology can support rehabilitation principles and outcomes. This shift in purpose has been demonstrated by the journals selected for submissions from the scientific community as well as the modification in mission and focus of particular journals.
{"title":"Dissemination of research in virtual reality-based rehabilitation: Journal publication profiles","authors":"Patrice L. (Tamar) Weiss, D. Raban, Dorit Geifman, E. Keshner","doi":"10.1109/ICVR46560.2019.8994545","DOIUrl":"https://doi.org/10.1109/ICVR46560.2019.8994545","url":null,"abstract":"The application of virtual reality (VR) to rehabilitation is a relatively young, interdisciplinary field where clinical implementation very rapidly follows scientific discovery and technological advancement. Recently, computational tools in the area of data and information science have provided researchers with an ability to examine trends in their field. These tools have been used in all areas of science, from the humanities and social sciences to the health and biological sciences. The objective of the current paper is to study patterns of academic publications in the VR-based rehabilitation literature over the past 22 years. We conclude that exploring the distribution of topics and journals in the field of VR-based rehabilitation reveals a science that is evolving from one with a predominantly technology development focus, to one that focuses on how technology can support rehabilitation principles and outcomes. This shift in purpose has been demonstrated by the journals selected for submissions from the scientific community as well as the modification in mission and focus of particular journals.","PeriodicalId":179905,"journal":{"name":"2019 International Conference on Virtual Rehabilitation (ICVR)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129339847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.1109/ICVR46560.2019.8994473
Shani Kimel Naor, R. Yanovich, Y. Bahat, M. Plotnik, I. Ketko, Amihai Gottlieb, O. Ben-Gal, Y. Heled
Athletes, soldiers, and rescue personnel are often required to perform intensive and prolonged physically demanding activities while remaining cognitively focused. The combined effect of physical and cognitive tasks is of great interest, as both efforts share central nervous system reserves. Amid a larger study that is aimed to create an ecologically validated virtual reality (VR) - based experimental protocol to explore the effect of high-load physical and cognitive efforts on young individuals, the present report focuses on comparing new cognitive tasks presented in the context of simulated military missions with physical load to already established cognitive testing battery. Twelve young participants performed a 10 Km loaded march on a treadmill in VR settings with or without additional cognitive tasks (VR-COG). Each experimental day, subjects underwent pre-and post-evaluation, in which cognitive (trail making test – the color trail test CTT version, and SYNWIN battery for multitasking evaluation) and physical tests (time to exhaustion test – TTE) were conducted. In general, strong or moderate correlations were found between VR-COG performances and the cognitive tests. The VR-COG tasks, together with CTT components, were able to successfully predict the effect of the combined physical and cognitive load on the multitasking performance. Multitasking was evaluated by the SYNWIN score. We believe that our protocol allows optimal conditions for measurement of the effect of high-load physical and cognitive efforts for an extended period of time, thus contributing to the motor-cognitive interaction model knowledge base. It is apparent that virtual environments are ideal set ups for studying military activities, as they enable the participants to experience a particular situation within a controlled area.
{"title":"Developing and Validating Virtual Reality Tool for the Evaluation of Cognitive and Physical Performance During Simulated lengthy field March","authors":"Shani Kimel Naor, R. Yanovich, Y. Bahat, M. Plotnik, I. Ketko, Amihai Gottlieb, O. Ben-Gal, Y. Heled","doi":"10.1109/ICVR46560.2019.8994473","DOIUrl":"https://doi.org/10.1109/ICVR46560.2019.8994473","url":null,"abstract":"Athletes, soldiers, and rescue personnel are often required to perform intensive and prolonged physically demanding activities while remaining cognitively focused. The combined effect of physical and cognitive tasks is of great interest, as both efforts share central nervous system reserves. Amid a larger study that is aimed to create an ecologically validated virtual reality (VR) - based experimental protocol to explore the effect of high-load physical and cognitive efforts on young individuals, the present report focuses on comparing new cognitive tasks presented in the context of simulated military missions with physical load to already established cognitive testing battery. Twelve young participants performed a 10 Km loaded march on a treadmill in VR settings with or without additional cognitive tasks (VR-COG). Each experimental day, subjects underwent pre-and post-evaluation, in which cognitive (trail making test – the color trail test CTT version, and SYNWIN battery for multitasking evaluation) and physical tests (time to exhaustion test – TTE) were conducted. In general, strong or moderate correlations were found between VR-COG performances and the cognitive tests. The VR-COG tasks, together with CTT components, were able to successfully predict the effect of the combined physical and cognitive load on the multitasking performance. Multitasking was evaluated by the SYNWIN score. We believe that our protocol allows optimal conditions for measurement of the effect of high-load physical and cognitive efforts for an extended period of time, thus contributing to the motor-cognitive interaction model knowledge base. It is apparent that virtual environments are ideal set ups for studying military activities, as they enable the participants to experience a particular situation within a controlled area.","PeriodicalId":179905,"journal":{"name":"2019 International Conference on Virtual Rehabilitation (ICVR)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123938342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.1109/ICVR46560.2019.8994457
P. Chojecki, Mykyta Kovalenko, Detlef Runde, D. Przewozny, O. Schreer
In this poster, we discuss the main challenges that need to be addressed to make immersive virtual reality (VR) assessment and training tools valid and usable for neuropsychological applications and clinical uses. We especially argue the importance of enabling natural, easy to use and precise interaction in order to tap into the full potential of VR advantages. We then address some of the main identified challenges and propose solutions and approaches for contact-free, hand-object manipulations for assessment and training VR applications. Our experiences are based on our research and development within the VReha project.
{"title":"Intentional, accurate and natural object placement in virtual reality based neuropsychological assessment","authors":"P. Chojecki, Mykyta Kovalenko, Detlef Runde, D. Przewozny, O. Schreer","doi":"10.1109/ICVR46560.2019.8994457","DOIUrl":"https://doi.org/10.1109/ICVR46560.2019.8994457","url":null,"abstract":"In this poster, we discuss the main challenges that need to be addressed to make immersive virtual reality (VR) assessment and training tools valid and usable for neuropsychological applications and clinical uses. We especially argue the importance of enabling natural, easy to use and precise interaction in order to tap into the full potential of VR advantages. We then address some of the main identified challenges and propose solutions and approaches for contact-free, hand-object manipulations for assessment and training VR applications. Our experiences are based on our research and development within the VReha project.","PeriodicalId":179905,"journal":{"name":"2019 International Conference on Virtual Rehabilitation (ICVR)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123054189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.1109/ICVR46560.2019.8994586
G. Burdea, Emma Kaplan, Phalgun Nori, S. Pollack, K. Polistico, Nam Kim, Ashwin Kadaru, D. Roll, N. Grampurohit, A. Barrett, M. Oh-Park, Jenny Masmela
Spasticity or increase in muscle tone presents challenges during post-stroke rehabilitation. The use of off-the-shelf game controllers is problematic for individuals with hand spasticity. The novel BrightBrainer Grasp (BBG) controller was designed to overcome these barriers when used in virtual rehabilitation of individuals post-stroke. The custom controller measures power grasp, finger extension, wrist position and orientation, as well as 3D hand position. It is designed to minimize friction when used by those with no gravity bearing. Two controllers were used in bilateral training. This paper presents a detailed description of the BBG controllers and their interaction with the BrightBrainer™ gaming system. Two case reports of individuals chronic post-stroke who participated in a 4-week telerehabilitation intervention are included.
{"title":"Novel Therapeutic Game Controller for Telerehabilitation of Spastic Hands: Two Case Studies","authors":"G. Burdea, Emma Kaplan, Phalgun Nori, S. Pollack, K. Polistico, Nam Kim, Ashwin Kadaru, D. Roll, N. Grampurohit, A. Barrett, M. Oh-Park, Jenny Masmela","doi":"10.1109/ICVR46560.2019.8994586","DOIUrl":"https://doi.org/10.1109/ICVR46560.2019.8994586","url":null,"abstract":"Spasticity or increase in muscle tone presents challenges during post-stroke rehabilitation. The use of off-the-shelf game controllers is problematic for individuals with hand spasticity. The novel BrightBrainer Grasp (BBG) controller was designed to overcome these barriers when used in virtual rehabilitation of individuals post-stroke. The custom controller measures power grasp, finger extension, wrist position and orientation, as well as 3D hand position. It is designed to minimize friction when used by those with no gravity bearing. Two controllers were used in bilateral training. This paper presents a detailed description of the BBG controllers and their interaction with the BrightBrainer™ gaming system. Two case reports of individuals chronic post-stroke who participated in a 4-week telerehabilitation intervention are included.","PeriodicalId":179905,"journal":{"name":"2019 International Conference on Virtual Rehabilitation (ICVR)","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126917497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.1109/ICVR46560.2019.8994644
P. Archambault, Catherine Bigras
In this study, we measured if practice of a wheelchair activity in a virtual reality simulator (entering an elevator) improved wheelchair positioning skills in naïve, healthy adults. Performance was assessed immediately after practice, two days later (retention) and in a real-world equivalent task (transfer). The influence of augmented feedback on retention and transfer was also assessed. Forty participants were randomized to either an augmented feedback group (who received information on collisions and on task completion time) and a no-feedback group. Following training, both groups improved their wheelchair positioning abilities. Learning was maintained at retention and skills transferred to the real-world wheelchair. Augmented feedback did not procure any additional effects. Practice in a virtual reality simulator significantly improved wheelchair positioning skills. Higher performance gains could be achieved by providing task-specific feedback.
{"title":"Improving wheelchair driving performance in a virtual reality simulator","authors":"P. Archambault, Catherine Bigras","doi":"10.1109/ICVR46560.2019.8994644","DOIUrl":"https://doi.org/10.1109/ICVR46560.2019.8994644","url":null,"abstract":"In this study, we measured if practice of a wheelchair activity in a virtual reality simulator (entering an elevator) improved wheelchair positioning skills in naïve, healthy adults. Performance was assessed immediately after practice, two days later (retention) and in a real-world equivalent task (transfer). The influence of augmented feedback on retention and transfer was also assessed. Forty participants were randomized to either an augmented feedback group (who received information on collisions and on task completion time) and a no-feedback group. Following training, both groups improved their wheelchair positioning abilities. Learning was maintained at retention and skills transferred to the real-world wheelchair. Augmented feedback did not procure any additional effects. Practice in a virtual reality simulator significantly improved wheelchair positioning skills. Higher performance gains could be achieved by providing task-specific feedback.","PeriodicalId":179905,"journal":{"name":"2019 International Conference on Virtual Rehabilitation (ICVR)","volume":"755 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126946255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.1109/ICVR46560.2019.8994515
D. C. Porras, J. V. Jacobs, R. Inzelberg, O. Keren, G. Zeilig, M. Plotnik
Postural adjustments are essential for balance control and to reduce risk of falling. One emerging method to train reactive postural control consists in exposing individuals to safe and controlled destabilizing perturbations that intend to simulate changing conditions that can lead to falls. Studies using virtual reality suggest that visual perturbations engage mechanisms of motor adaptation, increase electrocortical activity and modulate balance performance. What is not yet clear is the impact of trunk and limb muscles activation on the postural adjustments responsible to maintain balance control. This paper aims to map the response of trunk and limb muscles to visual perturbations, and compare them to those of physical perturbations. Additionally, our study includes vertical perturbations (i.e. balance disturbances in the vertical plane) known to be a major cause of falling. Therefore, this paper also compares muscles responses to both horizontal and vertical perturbations. Fourteen healthy participants (ten males; age: 27±4; BMI: 23.8±2.6 kg/m2) stood on a moveable platform within a virtual reality system projecting visual scenes over a 360° dome-shaped screen such that the participant appeared to be standing in the middle of a room. Concomitantly, the electrical activity of tibialis anterior, gastrocnemius, rectus femoris, hamstring, rectus abdominis, paraspinal, external oblique and deltoid muscles was captured. Amid a larger protocol, this paper reports on randomly presented 1) visual perturbations; i.e. the virtual room moves during 0.35 seconds a distance corresponding to 14 cm in four directions (forward - FP, backward - BP, upward - UP, downward - DP), each repeated three times; and 2) physical perturbations (12cm displacement in one second) for the four directions and two sensory conditions: static camera (SC; virtual room remains static) and dynamic camera (DC; corresponding transitions in the visual scenery). We calculated three muscle activation parameters: onset latency, duration of activation, and magnitude. Separate 2-factor repeated-measures ANOVA were applied for each outcome measure across factors of perturbation direction (FP, BP, UP and DP) and condition (VIS, SC, DC). Forward visual perturbations led to longer onset latencies when compared to upward and downward visual perturbations (e.g. in the gastrocnemius: respectively, 443±56.6 ms vs. 326±39.6 ms and 334±51.1 ms, P<0.05). Duration of activation was longer following downward visual perturbations than after backward visual perturbations in the rectus femoris (respectively, 630±120 ms vs 335±81.2 ms, P<0.05). All lower limbs and the paraspinal muscles presented with a longer onset latency in response to visual perturbations in comparison to both types of physical perturbations (SC and DC) (P<0.05). The magnitude of activation following visual perturbations was smaller than both types of physical perturbations in all muscles (P<0.05). Duration of activation was also longer
{"title":"Is the room moving? Muscle responses following visual perturbations","authors":"D. C. Porras, J. V. Jacobs, R. Inzelberg, O. Keren, G. Zeilig, M. Plotnik","doi":"10.1109/ICVR46560.2019.8994515","DOIUrl":"https://doi.org/10.1109/ICVR46560.2019.8994515","url":null,"abstract":"Postural adjustments are essential for balance control and to reduce risk of falling. One emerging method to train reactive postural control consists in exposing individuals to safe and controlled destabilizing perturbations that intend to simulate changing conditions that can lead to falls. Studies using virtual reality suggest that visual perturbations engage mechanisms of motor adaptation, increase electrocortical activity and modulate balance performance. What is not yet clear is the impact of trunk and limb muscles activation on the postural adjustments responsible to maintain balance control. This paper aims to map the response of trunk and limb muscles to visual perturbations, and compare them to those of physical perturbations. Additionally, our study includes vertical perturbations (i.e. balance disturbances in the vertical plane) known to be a major cause of falling. Therefore, this paper also compares muscles responses to both horizontal and vertical perturbations. Fourteen healthy participants (ten males; age: 27±4; BMI: 23.8±2.6 kg/m2) stood on a moveable platform within a virtual reality system projecting visual scenes over a 360° dome-shaped screen such that the participant appeared to be standing in the middle of a room. Concomitantly, the electrical activity of tibialis anterior, gastrocnemius, rectus femoris, hamstring, rectus abdominis, paraspinal, external oblique and deltoid muscles was captured. Amid a larger protocol, this paper reports on randomly presented 1) visual perturbations; i.e. the virtual room moves during 0.35 seconds a distance corresponding to 14 cm in four directions (forward - FP, backward - BP, upward - UP, downward - DP), each repeated three times; and 2) physical perturbations (12cm displacement in one second) for the four directions and two sensory conditions: static camera (SC; virtual room remains static) and dynamic camera (DC; corresponding transitions in the visual scenery). We calculated three muscle activation parameters: onset latency, duration of activation, and magnitude. Separate 2-factor repeated-measures ANOVA were applied for each outcome measure across factors of perturbation direction (FP, BP, UP and DP) and condition (VIS, SC, DC). Forward visual perturbations led to longer onset latencies when compared to upward and downward visual perturbations (e.g. in the gastrocnemius: respectively, 443±56.6 ms vs. 326±39.6 ms and 334±51.1 ms, P<0.05). Duration of activation was longer following downward visual perturbations than after backward visual perturbations in the rectus femoris (respectively, 630±120 ms vs 335±81.2 ms, P<0.05). All lower limbs and the paraspinal muscles presented with a longer onset latency in response to visual perturbations in comparison to both types of physical perturbations (SC and DC) (P<0.05). The magnitude of activation following visual perturbations was smaller than both types of physical perturbations in all muscles (P<0.05). Duration of activation was also longer","PeriodicalId":179905,"journal":{"name":"2019 International Conference on Virtual Rehabilitation (ICVR)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123709251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.1109/ICVR46560.2019.8994638
Sharon Harel, R. Kizony, Hadas Kfir, Yoram Feldman, Mordechai Shani
The purpose of this paper is to describe implementation of VR-based and video-based cognitive telerehabilitation, as a part of a large clinical telerehabilitation service. Three clients in the chronic phase after an Acquired Brain Injury received cognitive tele-rehabilitation with a 3D sensor-based platform (VR-based system) and a video-based system. The therapy was provided on-line, once or twice a week. Each client set at least two functional goals using the Canadian Occupational Performance Measure. Improvement of at least one goal was seen in all clients. It seems that the use of the VR-based system together with the video-based system is feasible and may enhance adherence to treatment and generalization to daily activities.
{"title":"Integration between virtual-reality and video-based systems to deliver cognitive tele-rehabilitation; three case studies","authors":"Sharon Harel, R. Kizony, Hadas Kfir, Yoram Feldman, Mordechai Shani","doi":"10.1109/ICVR46560.2019.8994638","DOIUrl":"https://doi.org/10.1109/ICVR46560.2019.8994638","url":null,"abstract":"The purpose of this paper is to describe implementation of VR-based and video-based cognitive telerehabilitation, as a part of a large clinical telerehabilitation service. Three clients in the chronic phase after an Acquired Brain Injury received cognitive tele-rehabilitation with a 3D sensor-based platform (VR-based system) and a video-based system. The therapy was provided on-line, once or twice a week. Each client set at least two functional goals using the Canadian Occupational Performance Measure. Improvement of at least one goal was seen in all clients. It seems that the use of the VR-based system together with the video-based system is feasible and may enhance adherence to treatment and generalization to daily activities.","PeriodicalId":179905,"journal":{"name":"2019 International Conference on Virtual Rehabilitation (ICVR)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121909015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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