scholarly journals The center of pressure and ankle muscle co-contraction in response to anterior-posterior perturbations

PLoS ONE ◽  
2018 ◽  
Vol 13 (11) ◽  
pp. e0207667 ◽  
Author(s):  
Dongwon Kim ◽  
Jong-Moon Hwang
Keyword(s):  
Center Of Pressure ◽  
Ankle Muscle ◽  
Anterior Posterior

Comparing Standing Balance at Real and Virtual Elevated Environments

2002 ◽  
Vol 46 (26) ◽  
pp. 2169-2173
Author(s):  
Peter Simeonov ◽  
Hongwei Hsiao ◽  
Brian Dotson ◽  
Douglas Amnions
Keyword(s):  
Postural Balance ◽  
Occupational Safety ◽  
Center Of Pressure ◽  
Ground Level ◽  
Occupational Safety And Health ◽  
Visual Simulation ◽  
Mean Velocity ◽  
Deformable Surfaces ◽  
Safety And Health ◽  
Anterior Posterior

The study evaluated the efficacy of a surround-screen virtual reality (SSVR) system in simulating heights for studying human postural balance at elevation. Twenty four subjects performed standing tasks at 9-m elevation and ground level, on firm and deformable surfaces, in a real environment (RE) and a comparable virtual environment (VE). The RE was the interior of the high-bay laboratory at the National Institute for Occupational Safety and Health (NIOSH) in Morgantown, West Virginia; the VE simulated this environment in the SSVR system. Medial-lateral and anterior-posterior body sways and mean velocity of the human center-of-pressure displacement were collected using a force platform. The results indicated that the sway parameters were similar in VE and RE at elevation on both firm and deformable surfaces. At ground level, the sway parameters were significantly increased in the VE compared to the RE on a deformable surface, but not on a firm surface. It appears that visual simulation of elevated environments within a SSVR is adequate for studying the risk factors leading to losing balance and fall incidents.

scholarly journals Influence of Foot Progression Angle on Center of Pressure During Stair Ascending in Subjects With Chronic Ankle Instability

2021 ◽  
Vol 15 ◽  
pp. 350-354
Author(s):  
Jung-Hyun Ban ◽  
Tae-Ho Kim
Keyword(s):  
Center Of Pressure ◽  
Ankle Instability ◽  
Chronic Ankle Instability ◽  
Foot Progression Angle ◽  
Significant Difference ◽  
The Stability ◽  
Neutral Posture ◽  
Criteria For Selection ◽  
Anterior Posterior ◽  
Selection Of

The purpose of this study was to identify changes in the center of pressure during stair ascending in subjects with chronic ankle instability while different angles of foot are applied. The subjects of this study were 20 male and female adults with chronic ankle instability were selected from among the employees of D Hospital in Daegu Metropolitan City. The criteria for selection of subjects with chronic ankle instability were those who felt wobbling in the ankle joint and scored not higher than 24 points in a test using the Cumberland Ankle Instability Tool (CAIT). The subjects carried out stair ascending in neutral, toe-in and toe-out postures, respectively, and changes in the center of pressure (COP) were compared and analyzed. The results of this study, no statistically significant difference appeared in the comparison between the toe-in posture and neutral posture or between the neutral posture and the toe-out posture but medial/lateral movements of the center of pressure showed significant differences between the toe-in and toe-out postures. In addition, the total travel range and the moving range of the center of pressure, the average velocity, and the anterior/posterior movements of the center of pressure showed no statistically significant difference among all three postures. As a result, it could be seen that when adults with chronic ankle instability climb the stairs, the toe-in posture reduce the medial/lateral movements of the center of pressure thereby increasing the stability of the ankle and effectively preventing re-injuries.

scholarly journals Closing the Wearable Gap—Part V: Development of a Pressure-Sensitive Sock Utilizing Soft Sensors

Sensors ◽  
2019 ◽  
Vol 20 (1) ◽  
pp. 208 ◽  
Author(s):  
Tony Luczak ◽  
Reuben F. Burch V ◽  
Brian K. Smith ◽  
Daniel W. Carruth ◽  
John Lamberth ◽  
...  
Keyword(s):  
Center Of Pressure ◽  
Moving Average ◽  
Pearson Correlation ◽  
Soft Sensors ◽  
Shear Forces ◽  
Autoregressive Integrated Moving Average ◽  
Pressure Sensitive ◽  
Sensor Orientation ◽  
R Value ◽  
Anterior Posterior

The purpose of this study was to evaluate the use of compressible soft robotic sensors (C-SRS) in determining plantar pressure to infer vertical and shear forces in wearable technology: A ground reaction pressure sock (GRPS). To assess pressure relationships between C-SRS, pressure cells on a BodiTrakTM Vector Plate, and KistlerTM Force Plates, thirteen volunteers performed three repetitions of three different movements: squats, shifting center-of-pressure right to left foot, and shifting toes to heels with C-SRS in both anterior–posterior (A/P) and medial–lateral (M/L) sensor orientations. Pearson correlation coefficient of C-SRS to BodiTrakTM Vector Plate resulted in an average R-value greater than 0.70 in 618/780 (79%) of sensor to cell comparisons. An average R-value greater than 0.90 was seen in C-SRS comparison to KistlerTM Force Plates during shifting right to left. An autoregressive integrated moving average (ARIMA) was conducted to identify and estimate future C-SRS data. No significant differences were seen in sensor orientation. Sensors in the A/P orientation reported a mean R2 value of 0.952 and 0.945 in the M/L sensor orientation, reducing the effectiveness to infer shear forces. Given the high R values, the use of C-SRSs to infer normal pressures appears to make the development of the GRPS feasible.

scholarly journals Effect of Toe Type on Static Balance in Ballet Dancers

2020 ◽  
Vol 35 (1) ◽  
pp. 35-41
Author(s):  
Momoko Kizawa ◽  
Toshito Yasuda ◽  
Hiroaki Shima ◽  
Katsunori Mori ◽  
Seiya Tsujinaka ◽  
...  
Keyword(s):  
Postural Stability ◽  
Center Of Pressure ◽  
Ground Reaction Forces ◽  
Bipedal Stance ◽  
Ballet Dancers ◽  
Maximum Range ◽  
Trajectory Length ◽  
Reaction Forces ◽  
Second Toe ◽  
Anterior Posterior

OBJECTIVES: Some forefoot shapes are ideal for pointe work in ballet. Egyptian-type, with the hallux being longest and the remaining toes decreasing in size, and Greek-type, with the second toe longer than the hallux, are considered less optimal for pointe work. Square-type, with the second toe the same length as the hallux, is considered optimal. This study compared postural stability in the bipedal stance, demi pointe, and en pointe between ballet dancers with the two toe types using a stabilometer. METHODS: This study included 25 Japanese ballet academy dancers who had received ballet lessons for at least 6 years. Toes were categorized into Egyptian-type (n=14) and square-type (n=11). Bipedal stance, demi pointe, and en pointe were tested. Center of pressure (COP) parameters were calculated from ground-reaction forces using two force plates: total trajectory length (LNG), velocities of anterior-posterior (VAP) and medial-lateral directions (VML), and maximum range displacement in the anterior-posterior (MAXAP) and medial-lateral directions (MAXML). Mann-Whitney U-tests were used to examine differences in COP parameters. RESULTS: There were no differences in parameters during bipedal stance or demi pointe. However, dancers with Egyptian-type toes had significantly greater LNG (p<0.01), VML (p=0.01), MAXML (p<0.01), and MAXAP (p=0.03) during en pointe. CONCLUSIONS: Ballet dancers with Egyptian-type toes demonstrated greater displacement in the medial-lateral and anterior-posterior directions during en pointe. Ballet dancers should be aware of toe types and sway character to optimize ballet training and balance.

scholarly journals In-Shoe Plantar Pressure Measurement—Influence of Insole Placement on Selected Parameters during Running

Proceedings ◽  
2020 ◽  
Vol 49 (1) ◽  
pp. 50 ◽  
Author(s):  
Franziska Mally ◽  
Otto Hofstätter ◽  
Markus Eckelt
Keyword(s):  
Pressure Measurement ◽  
Plantar Pressure ◽  
Center Of Pressure ◽  
Pressure Sensing ◽  
Pressure Decrease ◽  
Running Shoes ◽  
Mean Pressure ◽  
Plantar Pressure Measurement ◽  
Healthy Participants ◽  
Anterior Posterior

While it is assumed that pressure-sensing insoles are usually placed directly below the foot and on top of the shoes’ standard insoles, nearly no previously published study actually describes the procedure, which leaves a slight uncertainty. Therefore, the aim of this study was to evaluate whether the placement has an influence on selected parameters or not. Five healthy participants took part in the measurements and ran on a treadmill at a running velocity of 10 km/h with three different running shoes. Plantar pressure was measured using pressure-sensing insoles, which were once placed on top and once below the shoes’ standard insoles. Selected parameters were the maximum and mean pressure and the range of the center of pressure (COP) in anterior–posterior and medial–lateral directions. The results indicate that maximum and mean pressure decrease when the pressure-sensing insole lies below the shoe’s insole and the medial–lateral COP is the least effected parameter.

A Comparison of Two Thera-Band Training Rehabilitation Protocols on Postural Control

2007 ◽  
Vol 16 (2) ◽  
pp. 75-84 ◽  
Author(s):  
Alecia Puls ◽  
Phillip Gribble
Keyword(s):  
Postural Control ◽  
Healthy Subjects ◽  
Mixed Model ◽  
Outcome Measure ◽  
Center Of Pressure ◽  
Main Outcome Measure ◽  
Rehabilitation Protocols ◽  
Ankle Rehabilitation ◽  
Eyes Open ◽  
Anterior Posterior

Context:Thera-Band™ (TB) exercises are commonly utilized in ankle rehabilitation, but previous studies have shown inconsistent results.Objective:To compare two TB protocols among healthy subjects in improving postural control.Design:Mixed model design.Setting:Research laboratory.Participants:Thirty healthy subjects divided into a control (CON), three times/week (TB3) or five times/week (TB5) group.Intervention:Training groups completed TB quick-kick protocols for six weeks either three (TB3) or five times (TB5) per week.Main Outcome Measure:Center of pressure velocity in the anterior/posterior (COPVX) and medial/lateral (COPVY) directions.Results:There were no differences related to Group or Side. COPVX in the eyes open (EO) condition increased pre-post. COPVY decreased pre-post.Conclusion:The lack of differences between Groups and Side indicates these specific TB training protocols did not impact static postural control differently among healthy subjects.

Comparison of Center of Pressure and Kinematic Differences in Grand Plié With and Without the Barre

2020 ◽  
Vol 24 (3) ◽  
pp. 135-141
Author(s):  
Rachael Greenwell ◽  
Margaret Wilson ◽  
Jennifer L. Deckert ◽  
Meghan Critchley ◽  
Michaela Keener ◽  
...  
Keyword(s):  
Lower Extremity ◽  
Knee Flexion ◽  
Center Of Pressure ◽  
Balance Control ◽  
Proprioceptive Information ◽  
Trunk Rotation ◽  
Hip Abduction ◽  
Hip Flexion ◽  
Control Balance ◽  
Anterior Posterior

The purpose of this study was to determine what differences exist when performing grand plié with and without the barre. Differences in center of pressure (COP) sway, trunk kinematics, and lower extremity kinematics were used in this analysis for both first (P1) and fifth positions (P5). It was hypothesized that use of the barre would result in decreased COP sway, but increased asymmetries in trunk and lower extremity kinematics would be seen compared with the same movements performed without the barre in both positions. Sixteen collegiate dancers (1 male, 15 female) performed three trials of grand plié in P1 and P5 (right leg crossed in front) with or without the barre, for a total of 12 trials. For the barre condition (BC), participants demonstrated less time to complete grand plié, slightly less depth in grand plié, and decreased anterior-posterior (AP) sway compared to the without barre condition (WBC). The BC condition showed increased peak left trunk rotation, right knee flexion, decreased right and left peak hip flexion, and increased right hip abduction in both P1 and P5. Comparing P1 to P5, there was decreased AP sway, decreased peak left trunk rotation, decreased peak right and left hip flexion, increased left hip abduction, and decreased right knee flexion in both BC and WBC conditions. For the BC, there was increased right hip abduction in P1 compared to P5. Our results indicate that while use of the barre provides proprioceptive information, which helps dancers to control balance and learn a motor control strategy, grand plié should also be taught without the barre to challenge the dancer's balance control with different movement patterns in space.

Patterns of Center of Pressure Migration during Prolonged Unconstrained Standing

Motor Control ◽  
1999 ◽  
Vol 3 (1) ◽  
pp. 12-27 ◽  
Author(s):  
Marcos Duarte ◽  
Valdimir M. Zatsiorsky
Keyword(s):  
Healthy Subjects ◽  
Center Of Pressure ◽  
Large Displacement ◽  
Time Intervals ◽  
Migration Patterns ◽  
Software Code ◽  
Continuous Displacement ◽  
Parameter Values ◽  
Anterior Posterior ◽  
Average Position

Prolonged (>30 min) unconstrained standing (PUS) was studied in 10 young healthy subjects. The usual methods of stabilographic analysis assume a random center of pressure (COP) migration. This study was based on the opposite idea and showed that during PUS, specific and consistent patterns of the COP migration can be recognized by a computer algorithm. Three COP migration patterns were found: (a) shifting, a fast displacement of the average position of COP from one region to another; (b) fidgeting, a fast and large displacement and returning of COP to approximately the same position; and (c) drifting, a slow continuous displacement of the average position of COP. A software code was written and default parameter values were chosen for recognizing COP migration patterns. For 30-min PUS the following patterns were identified: Shifting was generally observed every 316 ± 292 sec in the anterior-posterior (a-p) direction with an average shift amplitude of 17 ± 15 mm, and every 199 ± 148 sec in the medial-lateral (m-1) direction with an average shift amplitude of 22 ± 38 mm. Corresponding time intervals for fidgeting were 59 ± 15 sec in the a-p direction and 49±16 sec in the m-1 direction. The average drift-to-drift interval was 319 ± 173 sec in the a-p direction and 529 ± 333 sec in the m-1 direction.

Sign in / Sign up

Export Citation Format

Share Document