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Alashram AR. Combined robot-assisted therapy virtual reality for upper limb rehabilitation in stroke survivors: a systematic review of randomized controlled trials. Neurol Sci 2024:10.1007/s10072-024-07628-z. [PMID: 38837113 DOI: 10.1007/s10072-024-07628-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2024] [Accepted: 05/28/2024] [Indexed: 06/06/2024]
Abstract
BACKGROUND Upper limb impairments are among the most common consequences following a stroke. Recently, robot-assisted therapy (RT) and virtual reality (VR) have been used to improve upper limb function in stroke survivors. OBJECTIVES This review aims to investigate the effects of combined RT and VR on upper limb function in stroke survivors and to provide recommendations for researchers and clinicians in the medical field. METHODS We searched PubMed, SCOPUS, REHABDATA, PEDro, EMBASE, and Web of Science from inception to March 28, 2024. Randomized controlled trials (RCTs) involving stroke survivors that compared combined RT and VR interventions with either passive (i.e., sham, rest) or active (i.e., traditional therapy, VR, RT) interventions and assessed outcomes related to upper limb function (e.g., strength, muscle tone, or overall function) were included. The Cochrane Collaboration tool was used to evaluate the methodological quality of the included studies. RESULTS Six studies were included in this review. In total, 201 patients with stroke (mean age 57.84 years) were involved in this review. Four studies were considered 'high quality', while two were considered as 'moderate quality' on the Cochrane Collaboration tool. The findings showed inconsistent results for the effects of combined RT and VR interventions on upper limb function poststroke. CONCLUSION In conclusion, there are potential effects of combined RT and VR interventions on improving upper limb function, but further research is needed to confirm these findings, understand the underlying mechanisms, and assess the consistency and generalizability of the results.
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Affiliation(s)
- Anas R Alashram
- Department of Physiotherapy, Middle East University, Ammam, Jordan.
- Applied Science Research Center, Applied Science Private University, Amman, Jordan.
- Department of Human Sciences and Promotion of the Quality of Life, San Raffaele Roma Open University, Rome, Italy.
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Soleimani M, Ghazisaeedi M, Heydari S. The efficacy of virtual reality for upper limb rehabilitation in stroke patients: a systematic review and meta-analysis. BMC Med Inform Decis Mak 2024; 24:135. [PMID: 38790042 PMCID: PMC11127427 DOI: 10.1186/s12911-024-02534-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 05/14/2024] [Indexed: 05/26/2024] Open
Abstract
BACKGROUND Stroke frequently gives rise to incapacitating motor impairments in the upper limb. Virtual reality (VR) rehabilitation has exhibited potential for augmenting upper extremity recovery; nonetheless, the optimal techniques for such interventions remain a topic of uncertainty. The present systematic review and meta-analysis were undertaken to comprehensively compare VR-based rehabilitation with conventional occupational therapy across a spectrum of immersion levels and outcome domains. METHODS A systematic search was conducted in PubMed, IEEE, Scopus, Web of Science, and PsycNET databases to identify randomized controlled trials about upper limb rehabilitation in stroke patients utilizing VR interventions. The search encompassed studies published in the English language up to March 2023. The identified studies were stratified into different categories based on the degree of immersion employed: non-immersive, semi-immersive, and fully-immersive settings. Subsequent meta-analyses were executed to assess the impact of VR interventions on various outcome measures. RESULTS Of the 11,834 studies screened, 55 studies with 2142 patients met the predefined inclusion criteria. VR conferred benefits over conventional therapy for upper limb motor function, functional independence, Quality of life, Spasticity, and dexterity. Fully immersive VR showed the greatest gains in gross motor function, while non-immersive approaches enhanced fine dexterity. Interventions exceeding six weeks elicited superior results, and initiating VR within six months post-stroke optimized outcomes. CONCLUSIONS This systematic review and meta-analysis demonstrates that adjunctive VR-based rehabilitation enhances upper limb motor recovery across multiple functional domains compared to conventional occupational therapy alone after stroke. Optimal paradigms likely integrate VR's immersive capacity with conventional techniques. TRIAL REGISTRATION This systematic review and meta-analysis retrospectively registered in the OSF registry under the identifier [ https://doi.org/10.17605/OSF.IO/YK2RJ ].
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Affiliation(s)
- Mohsen Soleimani
- Department of Health Information Management and Medical Informatics, School of Allied Medical Sciences, Tehran University of Medical Sciences, Tehran, Iran
| | - Marjan Ghazisaeedi
- Department of Health Information Management and Medical Informatics, School of Allied Medical Sciences, Tehran University of Medical Sciences, Tehran, Iran
| | - Soroush Heydari
- Department of Health Information Management and Medical Informatics, School of Allied Medical Sciences, Tehran University of Medical Sciences, Tehran, Iran.
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Bryant L, Stubbs P, Bailey B, Nguyen V, Bluff A, Hemsley B. Interacting with virtual characters, objects and environments: investigating immersive virtual reality in rehabilitation. Disabil Rehabil Assist Technol 2024:1-11. [PMID: 38781087 DOI: 10.1080/17483107.2024.2353284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 05/04/2024] [Indexed: 05/25/2024]
Abstract
PURPOSE This pilot study aimed to (a) investigate opportunities for immersive Virtual Reality (VR) technology in communication, physical, and visual rehabilitation by examining the interaction of people without disabilities in a range of structured virtual environments; and (b) validate research protocols that might be used to evaluate the physical, visual, and verbal interaction of users in virtual worlds, and their safety while using the technology. METHODS Thirteen adults identifying as people without disability were exposed to VR via a head-mounted display. A video-review method was used to qualitatively code and analyse each participant's communication, movement, orientation, and support needs. RESULTS All participants oriented to their virtual environments sufficiently to use applications. Their spoken language was effective for interaction, although unconventional social behaviours were also observed. Two participants reported minor adverse reactions consistent with mild cybersickness. CONCLUSION The results provide insight into the types of environments and characters that support the greatest communicative, physical, and visual interaction in immersive VR. The tested protocols are useful to assess safety when using VR, and to observe communicative, physical, and visual interaction with virtual environments and characters. Implications for future research and use of VR with people with communication, physical and visual disability are discussed.
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Affiliation(s)
- Lucy Bryant
- Faculty of Health, University of Technology Sydney Graduate School of Health, Sydney, New South Wales, Australia
| | - Peter Stubbs
- Faculty of Health, University of Technology Sydney Graduate School of Health, Sydney, New South Wales, Australia
| | - Benjamin Bailey
- Faculty of Health, University of Technology Sydney Graduate School of Health, Sydney, New South Wales, Australia
- College of Health, Medicine and Wellbeing, University of Newcastle, Newcastle, New South Wales, Australia
| | - Vincent Nguyen
- Faculty of Health, University of Technology Sydney Graduate School of Health, Sydney, New South Wales, Australia
| | - Andrew Bluff
- Faculty of Transdisciplinary Innovation, University of Technology Sydney Animal Logic Academy, Sydney, New South Wales, Australia
| | - Bronwyn Hemsley
- Faculty of Health, University of Technology Sydney Graduate School of Health, Sydney, New South Wales, Australia
- College of Health, Medicine and Wellbeing, University of Newcastle, Newcastle, New South Wales, Australia
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4
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Hao J, Li Y, Remis A, He Z, Yao Z, Pu Y. Performance-based outcome measures of upper extremity in virtual reality and telerehabilitation: a systematic review. Neurol Sci 2024; 45:977-986. [PMID: 37904015 DOI: 10.1007/s10072-023-07158-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Accepted: 10/19/2023] [Indexed: 11/01/2023]
Abstract
OBJECTIVES This systematic review aimed to identify and synthesize evidence regarding measurement properties of upper extremity performance-based outcome measures performed in virtual reality or in telerehabilitation to inform clinical applications and research endeavors. METHODS Five bibliographic databases, PubMed, Embase, CINAHL, APA PsycINFO, and Scopus, were searched on July 12, 2023. Studies assessing the measurement properties (reliability, validity, responsiveness) of upper extremity performance-based outcome measures in virtual reality and telerehabilitation were eligible for inclusion. The COSMIN risk of bias checklist was used for methodological quality assessment. Study selection, data extraction, and quality assessment were completed by two independent reviewers. RESULTS A total of 240 records were identified from the five databases. Nine cross-sectional studies published from 2016 to 2023 were included. Participants included 210 patients with neurological conditions and 184 healthy subjects. In virtual reality studies, four implemented the Box and Block Test, one the Arm Research Action Test, and one the Peg Insertion Test. In telerehabilitation studies, three implemented the Fugl-Meyer Assessment Upper Extremity. For quality assessment, one study was rated inadequate, one was rated doubtful, and all others demonstrated adequate to good quality. Most studies demonstrated good test-retest reliability and concurrent validity to the original in-person assessments. CONCLUSION Implementing upper extremity performance-based outcome measures in virtual reality and telerehabilitation is feasible and promising. Further studies are warranted to develop and refine remote assessment paradigms and validate them on a larger scale to inform clinical application and promote digital health in rehabilitation.
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Affiliation(s)
- Jie Hao
- Department of Health & Rehabilitation Sciences, College of Allied Health Professions, University of Nebraska Medical Center, Omaha, NE, 68198, USA.
| | - Yanfei Li
- Department of Health & Rehabilitation Sciences, College of Allied Health Professions, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Andréas Remis
- Health Research Association of Keck Medicine, University of Southern California, Los Angeles, CA, 90033, USA
| | - Zhengting He
- Department of Epidemiology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, 21205, USA
| | - Zixuan Yao
- Department of Rehabilitation Medicine, Beijing Hospital, National Center of Gerontology, Institution of Geriatric Medicine, Chinese Academy of Medical Science, Beijing, 100051, People's Republic of China
| | - Yuqi Pu
- Department of Health & Rehabilitation Sciences, College of Allied Health Professions, University of Nebraska Medical Center, Omaha, NE, 68198, USA
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Willingham TB, Stowell J, Collier G, Backus D. Leveraging Emerging Technologies to Expand Accessibility and Improve Precision in Rehabilitation and Exercise for People with Disabilities. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2024; 21:79. [PMID: 38248542 PMCID: PMC10815484 DOI: 10.3390/ijerph21010079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 12/20/2023] [Accepted: 12/28/2023] [Indexed: 01/23/2024]
Abstract
Physical rehabilitation and exercise training have emerged as promising solutions for improving health, restoring function, and preserving quality of life in populations that face disparate health challenges related to disability. Despite the immense potential for rehabilitation and exercise to help people with disabilities live longer, healthier, and more independent lives, people with disabilities can experience physical, psychosocial, environmental, and economic barriers that limit their ability to participate in rehabilitation, exercise, and other physical activities. Together, these barriers contribute to health inequities in people with disabilities, by disproportionately limiting their ability to participate in health-promoting physical activities, relative to people without disabilities. Therefore, there is great need for research and innovation focusing on the development of strategies to expand accessibility and promote participation in rehabilitation and exercise programs for people with disabilities. Here, we discuss how cutting-edge technologies related to telecommunications, wearables, virtual and augmented reality, artificial intelligence, and cloud computing are providing new opportunities to improve accessibility in rehabilitation and exercise for people with disabilities. In addition, we highlight new frontiers in digital health technology and emerging lines of scientific research that will shape the future of precision care strategies for people with disabilities.
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Affiliation(s)
- T. Bradley Willingham
- Shepherd Center, Virginia C. Crawford Research Institute, Atlanta, GA 30309, USA (D.B.)
- Department of Physical Therapy, Georgia State University, Atlanta, GA 30302, USA
| | - Julie Stowell
- Shepherd Center, Virginia C. Crawford Research Institute, Atlanta, GA 30309, USA (D.B.)
- Department of Physical Therapy, Georgia State University, Atlanta, GA 30302, USA
| | - George Collier
- Shepherd Center, Virginia C. Crawford Research Institute, Atlanta, GA 30309, USA (D.B.)
| | - Deborah Backus
- Shepherd Center, Virginia C. Crawford Research Institute, Atlanta, GA 30309, USA (D.B.)
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Kiper P, Godart N, Cavalier M, Berard C, Cieślik B, Federico S, Kiper A, Pellicciari L, Meroni R. Effects of Immersive Virtual Reality on Upper-Extremity Stroke Rehabilitation: A Systematic Review with Meta-Analysis. J Clin Med 2023; 13:146. [PMID: 38202153 PMCID: PMC10780020 DOI: 10.3390/jcm13010146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 12/07/2023] [Accepted: 12/22/2023] [Indexed: 01/12/2024] Open
Abstract
Virtual reality (VR) is an innovative rehabilitation tool increasingly used in stroke rehabilitation. Fully immersive VR is a type of VR that closely simulates real-life scenarios, providing a high level of immersion, and has shown promising results in improving rehabilitation functions. This study aimed to assess the effect of immersive VR-based therapy for stroke patients on the upper extremities, activities of daily living (ADLs), and pain reduction and its acceptability and side effects. For this review, we gathered all suitable randomized controlled trials from PubMed, EMBASE, Cochrane Library, Scopus, and Web of Science. Out of 1532, 10 articles were included, with 324 participants. The results show that immersive VR offers greater benefits in comparison with conventional rehabilitation, with significant improvements observed in ADLs (SMD 0.58, 95% CI 0.25 to 0.91, I2 = 0%, p = 0.0005), overall function as measured by the Fugl-Meyer Assessment (MD 6.33, 95% CI 4.15 to 8.50, I2 = 25%, p = 0.00001), and subscales for the shoulder (MD 4.96, 95% CI-1.90-8.03, I2 = 25%, p = 0.002), wrist (MD 2.41, 95% CI-0.56-4.26, I2 = 0%, p = 0.01), and hand (MD 2.60, 95% CI-0.70-4.5°, I2 = 0%, p = 0.007). These findings highlight the potential of immersive VR as a valuable therapeutic option for stroke survivors, enhancing their ADL performance and upper-limb function. The immersive nature of VR provides an engaging and immersive environment for rehabilitation.
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Affiliation(s)
- Pawel Kiper
- Healthcare Innovation Technology Lab, IRCCS San Camillo Hospital, 30126 Venice, Italy (S.F.)
| | - Nathalie Godart
- Department of Physiotherapy, LUNEX International University of Health Exercise and Sports, L-4671 Differdange, Luxembourg; (N.G.)
| | - Manon Cavalier
- Department of Physiotherapy, LUNEX International University of Health Exercise and Sports, L-4671 Differdange, Luxembourg; (N.G.)
| | - Charlotte Berard
- Department of Physiotherapy, LUNEX International University of Health Exercise and Sports, L-4671 Differdange, Luxembourg; (N.G.)
| | - Błażej Cieślik
- Healthcare Innovation Technology Lab, IRCCS San Camillo Hospital, 30126 Venice, Italy (S.F.)
| | - Sara Federico
- Healthcare Innovation Technology Lab, IRCCS San Camillo Hospital, 30126 Venice, Italy (S.F.)
| | - Aleksandra Kiper
- Doctoral School of the University of Rzeszów, University of Rzeszów, 35-959 Rzeszów, Poland
| | | | - Roberto Meroni
- Department of Physiotherapy, LUNEX International University of Health Exercise and Sports, L-4671 Differdange, Luxembourg; (N.G.)
- Luxembourg Health & Sport Sciences Research Institute ASBL, L-4671 Differdange, Luxembourg
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Carnevale A, Mannocchi I, Schena E, Carli M, Sassi MSH, Marino M, Longo UG. Performance Evaluation of an Immersive Virtual Reality Application for Rehabilitation after Arthroscopic Rotator Cuff Repair. Bioengineering (Basel) 2023; 10:1305. [PMID: 38002429 PMCID: PMC10668954 DOI: 10.3390/bioengineering10111305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 10/11/2023] [Accepted: 10/30/2023] [Indexed: 11/26/2023] Open
Abstract
Few studies have evaluated the effectiveness of shoulder rehabilitation in virtual environments. The objective of this study was to investigate the performance of a custom virtual reality application (VR app) with a stereophotogrammetric system considered the gold standard. A custom VR app was designed considering the recommended rehabilitation exercises following arthroscopic rotator cuff repair. Following the setting of the play space, the user's arm length, and height, five healthy volunteers performed four levels of rehabilitative exercises. Results for the first and second rounds of flexion and abduction displayed low total mean absolute error values and low numbers of unmet conditions. In internal and external rotation, the number of times conditions were not met was slightly higher; this was attributed to a lack of isolated shoulder movement. Data is promising, and volunteers were able to reach goal conditions more often than not. Despite positive results, more literature comparing VR applications with gold-standard clinical parameters is necessary. Nevertheless, results contribute to a body of literature that continues to encourage the application of VR to shoulder rehabilitation programs.
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Affiliation(s)
- Arianna Carnevale
- Fondazione Policlinico Universitario Campus Bio-Medico, Via Álvaro del Portillo, 200, 00128 Roma, Italy; (A.C.); (M.M.)
| | - Ilaria Mannocchi
- Department of Industrial, Electronic and Mechanical Engineering, University of Roma Tre, Via Vito Volterra, 62, 00146 Roma, Italy; (I.M.); (M.C.); (M.S.H.S.)
| | - Emiliano Schena
- Unit of Measurement and Biomedical Instrumentation, Department of Engineering, Università Campus Bio-Medico di Roma, Via Álvaro del Portillo, 21, 00128 Roma, Italy;
| | - Marco Carli
- Department of Industrial, Electronic and Mechanical Engineering, University of Roma Tre, Via Vito Volterra, 62, 00146 Roma, Italy; (I.M.); (M.C.); (M.S.H.S.)
| | - Mohamed Saifeddine Hadj Sassi
- Department of Industrial, Electronic and Mechanical Engineering, University of Roma Tre, Via Vito Volterra, 62, 00146 Roma, Italy; (I.M.); (M.C.); (M.S.H.S.)
| | - Martina Marino
- Fondazione Policlinico Universitario Campus Bio-Medico, Via Álvaro del Portillo, 200, 00128 Roma, Italy; (A.C.); (M.M.)
| | - Umile Giuseppe Longo
- Fondazione Policlinico Universitario Campus Bio-Medico, Via Álvaro del Portillo, 200, 00128 Roma, Italy; (A.C.); (M.M.)
- Research Unit of Orthopaedic and Trauma Surgery, Department of Medicine and Surgery, Università Campus Bio-Medico di Roma, Via Álvaro del Portillo, 21, 00128 Roma, Italy
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Gunduz ME, Bucak B, Keser Z. Advances in Stroke Neurorehabilitation. J Clin Med 2023; 12:6734. [PMID: 37959200 PMCID: PMC10650295 DOI: 10.3390/jcm12216734] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 10/20/2023] [Accepted: 10/23/2023] [Indexed: 11/15/2023] Open
Abstract
Stroke is one of the leading causes of disability worldwide despite recent advances in hyperacute interventions to lessen the initial impact of stroke. Stroke recovery therapies are crucial in reducing the long-term disability burden after stroke. Stroke recovery treatment options have rapidly expanded within the last decade, and we are in the dawn of an exciting era of multimodal therapeutic approaches to improve post-stroke recovery. In this narrative review, we highlighted various promising advances in treatment and technologies targeting stroke rehabilitation, including activity-based therapies, non-invasive and minimally invasive brain stimulation techniques, robotics-assisted therapies, brain-computer interfaces, pharmacological treatments, and cognitive therapies. These new therapies are targeted to enhance neural plasticity as well as provide an adequate dose of rehabilitation and improve adherence and participation. Novel activity-based therapies and telerehabilitation are promising tools to improve accessibility and provide adequate dosing. Multidisciplinary treatment models are crucial for post-stroke neurorehabilitation, and further adjuvant treatments with brain stimulation techniques and pharmacological agents should be considered to maximize the recovery. Among many challenges in the field, the heterogeneity of patients included in the study and the mixed methodologies and results across small-scale studies are the cardinal ones. Biomarker-driven individualized approaches will move the field forward, and so will large-scale clinical trials with a well-targeted patient population.
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Affiliation(s)
- Muhammed Enes Gunduz
- Department of Neurology, University of Massachusetts Chan Medical School, Worcester, MA 01655, USA
| | - Bilal Bucak
- Department of Neurology, Mayo Clinic, Rochester, MN 55905, USA; (B.B.); (Z.K.)
| | - Zafer Keser
- Department of Neurology, Mayo Clinic, Rochester, MN 55905, USA; (B.B.); (Z.K.)
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Dordevic M, Maile O, Das A, Kundu S, Haun C, Baier B, Müller NG. A Comparison of Immersive vs. Non-Immersive Virtual Reality Exercises for the Upper Limb: A Functional Near-Infrared Spectroscopy Pilot Study with Healthy Participants. J Clin Med 2023; 12:5781. [PMID: 37762722 PMCID: PMC10531854 DOI: 10.3390/jcm12185781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Revised: 08/21/2023] [Accepted: 08/28/2023] [Indexed: 09/29/2023] Open
Abstract
Functional near-infrared spectroscopy (fNIRS) allows for a reliable assessment of oxygenated blood flow in relevant brain regions. Recent advancements in immersive virtual reality (VR)-based technology have generated many new possibilities for its application, such as in stroke rehabilitation. In this study, we asked whether there is a difference in oxygenated hemoglobin (HbO2) within brain motor areas during hand/arm movements between immersive and non-immersive VR settings. Ten healthy young participants (24.3 ± 3.7, three females) were tested using a specially developed VR paradigm, called "bus riding", whereby participants used their hand to steer a moving bus. Both immersive and non-immersive conditions stimulated brain regions controlling hand movements, namely motor cortex, but no significant differences in HbO2 could be found between the two conditions in any of the relevant brain regions. These results are to be interpreted with caution, as only ten participants were included in the study.
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Affiliation(s)
- Milos Dordevic
- Department of Chronic and Degenerative Diseases, Faculty of Health Sciences (FGW), Potsdam University, 14476 Potsdam, Germany
- Department of Neurology, Otto-von-Guericke University, 39120 Magdeburg, Germany
| | - Olga Maile
- Department of Neurology, Otto-von-Guericke University, 39120 Magdeburg, Germany
| | - Anustup Das
- Faculty of Informatics, Otto-von-Guericke University, 39106 Magdeburg, Germany
| | - Sumit Kundu
- Department of Chronic and Degenerative Diseases, Faculty of Health Sciences (FGW), Potsdam University, 14476 Potsdam, Germany
- Faculty of Informatics, Otto-von-Guericke University, 39106 Magdeburg, Germany
| | - Carolin Haun
- Edith-Stein Fachklinik, 76887 Bad Bergzabern, Germany
| | - Bernhard Baier
- Edith-Stein Fachklinik, 76887 Bad Bergzabern, Germany
- University Medical Center of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany
| | - Notger G. Müller
- Department of Chronic and Degenerative Diseases, Faculty of Health Sciences (FGW), Potsdam University, 14476 Potsdam, Germany
- Department of Neurology, Otto-von-Guericke University, 39120 Magdeburg, Germany
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