Comparison of Path Length and Ranges of Movement of the Center of Pressure and Reaction Time and Between Paired-Play and Solo-Play of a Virtual Reality Game

2017 ◽  
Vol 6 (3) ◽  
pp. 147-151 ◽  
Author(s):  
Sigal Portnoy ◽  
Ayelet Hersch ◽  
Tal Sofer ◽  
Sarit Tresser
Keyword(s):  
Virtual Reality ◽  
Reaction Time ◽  
Path Length ◽  
Center Of Pressure

scholarly journals Postural Control Disturbances Induced by Virtual Reality in Stroke Patients

2021 ◽  
Vol 11 (4) ◽  
pp. 1510
Author(s):  
Charles Morizio ◽  
Maxime Billot ◽  
Jean-Christophe Daviet ◽  
Stéphane Baudry ◽  
Christophe Barbanchon ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Postural Control ◽  
Virtual Environments ◽  
Center Of Pressure ◽  
Dynamic Condition ◽  
Static Condition ◽  
Stroke Patients ◽  
Post Stroke ◽  
Subacute Stroke

People who survive a stroke are often left with long-term neurologic deficits that induce, among other impairments, balance disorders. While virtual reality (VR) is growing in popularity for postural control rehabilitation in post-stroke patients, studies on the effect of challenging virtual environments, simulating common daily situations on postural control in post-stroke patients, are scarce. This study is a first step to document the postural response of stroke patients to different challenging virtual environments. Five subacute stroke patients and fifteen age-matched healthy adults were included. All participants underwent posturographic tests in control conditions (open and closed eyes) and virtual environment without (one static condition) and with avatars (four dynamic conditions) using a head-mounted device for VR. In dynamic environments, we modulated the density of the virtual crowd (dense and light crowd) and the avoidance space with the avatars (near or far). Center of pressure velocity was collected by trial throughout randomized 30-s periods. Results showed that more challenging conditions (dynamic condition) induced greater postural disturbances in stroke patients than in healthy counterparts. Our study suggests that virtual reality environments should be adjusted in light of obtaining more or less challenging conditions.

Postural Preparation to Making a Step: Is There a “Motor Program” for Postural Preparation?

2007 ◽  
Vol 23 (4) ◽  
pp. 261-274 ◽  
Author(s):  
Adriana M. Degani ◽  
Alessander Danna-Dos-Santos ◽  
Mark L. Latash
Keyword(s):  
Reaction Time ◽  
Simple Reaction Time ◽  
Center Of Pressure ◽  
Motor Program ◽  
Whole Body ◽  
Single Motor ◽  
Simple Reaction ◽  
Specific Manner ◽  
Young Subjects ◽  
Straight Ahead

We tested the hypothesis that a sequence of mechanical events occurs preceding a step that scales in time and magnitude as a whole in a task-specific manner, and is a reflection of a “motor program.” Young subjects made a step under three speed instructions and four tasks: stepping straight ahead, down a stair, up a stair, and over an obstacle. Larger center-of-pressure (COP) and force adjustments in the anteriorposterior direction and smaller COP and force adjustments in the mediolateral direction were seen during stepping forward and down a stair, as compared with the tasks of stepping up a stair and over an obstacle. These differences were accentuated during stepping under the simple reaction time instruction. These results speak against the hypothesis of a single motor program that would underlie postural preparation to stepping. They are more compatible with the reference configuration hypothesis of whole-body actions.

scholarly journals Total Reaction Time Performance of Individuals with Autism after a Virtual Reality Task

2015 ◽  
Vol 02 (05) ◽  
Author(s):  
Dafne Herrero ◽  
Tânia Brusque Crocetta ◽  
Thais Massetti ◽  
Íbis Ariana Pena de Moraes ◽  
Isabela Lopes Trevizan ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Reaction Time ◽  
Total Reaction ◽  
Time Performance ◽  
Reaction Time Performance ◽  
Total Reaction Time

The Biomechanical Evaluation of a Human-Robot Collaborative Task in a Physically Interactive Virtual Reality Simulation Testbed

2021 ◽  
Vol 65 (1) ◽  
pp. 403-407
Author(s):  
Manoj Srinivasan ◽  
Syed T. Mubarrat ◽  
Quentin Humphrey ◽  
Thomas Chen ◽  
Kieran Binkley ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Center Of Pressure ◽  
Low Cost ◽  
Real Life ◽  
Human Movement ◽  
Movement Kinematics ◽  
Industrial Training ◽  
Real Objects ◽  
Human Participants ◽  
Effective Transfer

In this study, we developed a low-cost simulated testbed of a physically interactive virtual reality (VR) system and evaluated its efficacy as an occupational virtual trainer for human-robot collaborative (HRC) tasks. The VR system could be implemented in industrial training applications for sensorimotor skill acquisitions and identifying potential task-, robot-, and human-induced hazards in the industrial environments. One of the challenges in designing and implementing such simulation testbed is the effective integration of virtual and real objects and environment, including human movement biomechanics. Therefore, this study aimed to compare the movement kinematics (joint angles) and kinetics (center of pressure) of the human participants while performing pick-and-place lifting tasks with and without using a physically interactive VR testbed. Results showed marginal differences in human movement kinematics and kinetics between real and virtual environment tasks, suggesting the effective transfer of training benefits from VR to real-life situations.

scholarly journals A comparison of two techniques for center of pressure measurements

2020 ◽  
Vol 7 ◽  
pp. 205566832092106
Author(s):  
Jessica DeBerardinis ◽  
Conner Neilsen ◽  
Daniel E Lidstone ◽  
Janet S Dufek ◽  
Mohamed B Trabia
Keyword(s):  
Strong Correlation ◽  
Path Length ◽  
Center Of Pressure ◽  
Single Step ◽  
Segment Length ◽  
Pressure Measurements ◽  
Pressure Data ◽  
Limited Sample ◽  
New Methods ◽  
Comparable Accuracy

Introduction Force platforms and pressure-measuring insoles are the most common tools used for measuring center of pressure. Earlier studies to assess these instruments suffered from limited sample sizes or an inadequate range of participant foot sizes. The purpose of this study was to propose new methods to extract and calculate comparably accurate center of pressure for the Kistler® force platform and Medilogic® insoles. Methods Center of pressure data were collected from 65 participants wearing pressure-measuring insoles (six different sizes). Participants walked over consecutive force platforms for three trials while wearing pressure-measuring insoles within socks. Onset force thresholds and center of pressure segment length thresholds were used to determine accurate center of pressure path length and width. A single step for each foot and trial was extracted from both instruments. Results A strong correlation was observed between instruments in center of pressure length (4.12 ± 6.72% difference, r = 0.74). Center of pressure width varied and was weakly correlated (–7.04 ± 4.48% difference, r = 0.11). Conclusions The results indicate that both instruments can measure center of pressure path length consistently and with comparable accuracy (differences < 10%). There were differences between instruments in measuring center of pressure path width, which were attributed to the limited number of sensors across the width of the insoles.

scholarly journals Postural Stability in Adolescent Girls with Progressive Idiopathic Scoliosis

2019 ◽  
Vol 2019 ◽  
pp. 1-5 ◽  
Author(s):  
Marzena Wiernicka ◽  
Tomasz Kotwicki ◽  
Ewa Kamińska ◽  
Dawid Łochyński ◽  
Mateusz Kozinoga ◽  
...  
Keyword(s):  
Idiopathic Scoliosis ◽  
Adolescent Girls ◽  
Postural Stability ◽  
Path Length ◽  
Center Of Pressure ◽  
Mean Amplitude ◽  
Growth Spurt ◽  
Control Group ◽  
Stability Parameters ◽  
Progressive Form

The aim of this work was to analyze postural stability of girls having progressive form of idiopathic scoliosis and undergoing specific period of the adolescent growth spurt. Twenty-seven girls, aged 13.4 ± 1.2 years, presenting structural idiopathic scoliosis, thoracic or thoracolumbar pattern, radiological Cobb angle 41.7 ± 17.4° (study group) and 37 healthy girls (control group) were included. The groups were sex, age, height, weight, and BMI matched. Postural stability examination was performed using two stabilometric platforms with visual control (eyes open) at three stages: (1) both legs’ stance, (2) left leg stance, and (3) right leg stance. The Center of Pressure (COP) sway path length, the area and the displacement amplitude were compared. For the double stance, no difference in postural stability parameters between the groups was found. However, for the right leg stance, the total sway path length was longer (p=0.04) and the mean amplitude of the lateral COP displacement was increased (p=0.03) in the scoliotic group. In conclusion, for double stance, the adolescent girls with progressive form of idiopathic scoliosis revealed fair postural stability compared to control group. An impaired postural control was observed during right leg stance.

scholarly journals The Effect of Balance and Sand Training on Postural Control in Elite Beach Volleyball Players

2020 ◽  
Vol 17 (23) ◽  
pp. 8981
Author(s):  
Sergio Sebastia-Amat ◽  
Luca Paolo Ardigò ◽  
Jose Manuel Jimenez-Olmedo ◽  
Basilio Pueo ◽  
Alfonso Penichet-Tomas
Keyword(s):  
Postural Control ◽  
Training Program ◽  
Path Length ◽  
Center Of Pressure ◽  
Dynamic Performance ◽  
Balance Training ◽  
Root Mean Square Amplitude ◽  
Balance Test ◽  
Positive Balance ◽  
Volleyball Players

The aim of this work was to evaluate the effectiveness of a 12-week-long balance training program on the postural control of elite male beach volleyball players and the effect on balance when swapping to specific sports training in the sand in the following 12 weeks. Six elite players were tested before and after the balance training program and also 12 weeks after the balance training had finished. To this aim, a pressure platform was used to collect the following center of pressure parameters: path length, speed, mean position, and root-mean-square amplitude in the medial-lateral and anteroposterior planes. Romberg quotients for the center of pressure parameters were also calculated. The results of the present study showed better static postural control after specific balance training: smaller path length and speed under open eyes condition in dominant (p = 0.015; p = 0.009, respectively) and non-dominant monopedal stances (p = 0.005; p = 0.004, respectively). Contrastingly, 12 weeks after the balance training program, the path length and speed values under open eyes condition in bipedal stance increased significantly (p = 0.045; p = 0.004, respectively) for sand training. According to our results, balance training is effective to achieve positive balance test scores. It is speculated, and yet to be proven, that sand training could be effective to improve dynamic and open eyes postural control during beach volleyball practice. In beach volleyball players, a balance training program is effective to develop static balance but the effect of ecological sand training on dynamic performance deserves specific investigation.

The Influence of Methylphenidate on Hyperactivity and Attention Deficits in Children With ADHD: A Virtual Classroom Test

2016 ◽  
Vol 24 (2) ◽  
pp. 277-289 ◽  
Author(s):  
A. Mühlberger ◽  
K. Jekel ◽  
T. Probst ◽  
M. Schecklmann ◽  
A. Conzelmann ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Reaction Time ◽  
Virtual Classroom ◽  
Head Movements ◽  
Time Variability ◽  
Adhd Group ◽  
Healthy Children ◽  
Reaction Time Variability ◽  
Children With Adhd ◽  
Omission Errors

Objective: This study compares the performance in a continuous performance test within a virtual reality classroom (CPT-VRC) between medicated children with ADHD, unmedicated children with ADHD, and healthy children. Method: N = 94 children with ADHD ( n = 26 of them received methylphenidate and n = 68 were unmedicated) and n = 34 healthy children performed the CPT-VRC. Omission errors, reaction time/variability, commission errors, and body movements were assessed. Furthermore, ADHD questionnaires were administered and compared with the CPT-VRC measures. Results: The unmedicated ADHD group exhibited more omission errors and showed slower reaction times than the healthy group. Reaction time variability was higher in the unmedicated ADHD group compared with both the healthy and the medicated ADHD group. Omission errors and reaction time variability were associated with inattentiveness ratings of experimenters. Head movements were correlated with hyperactivity ratings of parents and experimenters. Conclusion: Virtual reality is a promising technology to assess ADHD symptoms in an ecologically valid environment.

scholarly journals Static Balance in Patients with Vestibular Impairments: A Preliminary Study

Scientifica ◽  
2016 ◽  
Vol 2016 ◽  
pp. 1-4 ◽  
Author(s):  
Hossein Talebi ◽  
Mohammad Taghi Karimi ◽  
Seyed Hamid Reza Abtahi ◽  
Niloofar Fereshtenejad
Keyword(s):  
Path Length ◽  
Center Of Pressure ◽  
Balance Control ◽  
Force Plate ◽  
Static Balance ◽  
Eyes Closed ◽  
Significant Difference ◽  
Eyes Open ◽  
Age Limits ◽  
The Difference

Aims. Vestibular system is indicated as one of the most important sensors responsible for static and dynamic postural control. In this study, we evaluated static balance in patients with unilateral vestibular impairments.Materials and Methods. We compared static balance control using Kistler force plate platform between 10 patients with unilateral vestibular impairments and 20 normal counterparts in the same sex ratio and age limits (50±7). We evaluated excursion and velocity of center of pressure (COP) and path length in anteroposterior (AP) and mediolateral (ML) planes with eyes open and with eyes closed.Results. There was no significant difference between COP excursions in ML and AP planes between both groups with eyes open and eyes closed (pvalue > 0.05). In contrast, the difference between velocity and path length of COP in the mentioned planes was significant between both groups with eyes open and eyes closed (pvalue < 0.05).Conclusions. The present study showed the static instability and balance of patients with vestibular impairments indicated by the abnormal characteristics of body balance.

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