Foot pressure and center of pressure in athletes with ankle instability during lateral shuffling and running gait

2011 ◽  
Vol 21 (6) ◽  
pp. e461-e467 ◽  
Author(s):  
P.-Y. Huang ◽  
C.-F. Lin ◽  
L.-C. Kuo ◽  
J.-C. Liao
Keyword(s):  
Center Of Pressure ◽  
Ankle Instability ◽  
Foot Pressure

What is a valid cut-off value for evaluating ankle instability from center of pressure measurements?

Physiotherapy ◽  
2015 ◽  
Vol 101 ◽  
pp. e1530-e1531
Author(s):  
T. Toyooka ◽  
S. Sugiura ◽  
A. Takata ◽  
T. Ishizaki ◽  
Y. Omori ◽  
...  
Keyword(s):  
Center Of Pressure ◽  
Ankle Instability ◽  
Pressure Measurements

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.

Changes in Plantar Foot Pressure with In-Shoe Varus or Valgus Wedging

2004 ◽  
Vol 94 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Bart Van Gheluwe ◽  
Howard J. Dananberg
Keyword(s):  
Pressure Distribution ◽  
Loading Rate ◽  
Peak Pressure ◽  
Center Of Pressure ◽  
Scientific Evidence ◽  
Peak Load ◽  
Foot Orthoses ◽  
Foot Pressure ◽  
Custom Made

Varus and valgus wedging are commonly used by podiatric physicians in therapy with custom-made foot orthoses. This study aimed to provide scientific evidence of the effects on plantar foot pressure of applying in-shoe forefoot or rearfoot wedging. The plantar foot pressure distribution of 23 subjects walking on a treadmill was recorded using a pressure insole system for seven different wedging conditions, ranging from 3° valgus to 6° varus for the forefoot and from 4° valgus to 8° varus for the rearfoot. The results demonstrate that increasing varus wedging magnifies peak pressure and maximal loading rate at the medial forefoot and rearfoot, whereas increasing valgus wedging magnifies peak pressure and maximal loading rate at the lateral forefoot and rearfoot. As expected, the location of the center of pressure shifts medially with varus wedging and laterally with valgus wedging. However, these shifts are less significant than those in peak load and maximal loading rate. Timing variables such as interval from initial impact to peak load do not seem to be affected by forefoot or rearfoot wedging. Finally, rearfoot wedging does not significantly influence pressure variables of the forefoot; similarly, rearfoot pressure remains unaffected by forefoot wedging. (J Am Podiatr Med Assoc 94(1): 1-11, 2004)

scholarly journals Levodopa Reduces Muscle Tone and Lower Extremity Tremor in Parkinson’s Disease

1995 ◽  
Vol 22 (4) ◽  
pp. 280-285 ◽  
Author(s):  
Anne Burleigh ◽  
Fay Horak ◽  
John Nutt ◽  
James Frank
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Lower Extremity ◽  
Muscle Activity ◽  
Center Of Pressure ◽  
Muscle Tone ◽  
High Amplitude ◽  
Trunk Muscles ◽  
Foot Pressure ◽  
Control Subjects

AbstractObjectiveWe have quantified the effects of levodopa treatment in Parkinsonian subjects during maintained stance.MethodsElectromyographic muscle activity during quiet stance was assessed in subjects with Parkinson’s disease, who exhibited a fluctuating response to levodopa, and in age-matched control subjects. Stance stability was also assessed from mean displacement and velocity of the center of pressure excursions during stance.ResultsLower extremity and trunk muscles showed high amplitude activity in all Parkinson’s subjects when “off”, and a 4–5 Hz tremor in three of these subjects. When “on”, the amplitude of muscle activity was reduced in the distal muscles more than the proximal, while tremor was suppressed in all muscles. Corresponding to the excessive muscle activity, the Parkinson’s subjects had increased velocity and variability of velocity in the anterior-posterior center of foot pressure excursions, but the mean displacement of the center of pressure excursion was not different from the controls. The velocity of center of pressure excursions in the Parkinson’s subjects “on”, approached those of the control subjects suggesting that the excessive distal muscle amplitude and tremor contributed to the high velocity of the center of pressure.ConclusionsThese findings suggest that dopaminergic systems are involved in the regulation of muscle tone during stance. Depletion of dopaminergic transmission results in increased muscle tone and tremor in the lower extremities which may contribute to changes in posture and stability.

The Effects of Moving Environments on Thoracolumbar Kinematics and Foot Center of Pressure When Performing Lifting and Lowering Tasks

2012 ◽  
Vol 28 (2) ◽  
pp. 111-119 ◽  
Author(s):  
Carolyn A. Duncan ◽  
Scott N. MacKinnon ◽  
Wayne J. Albert
Keyword(s):  
Nova Scotia ◽  
Postural Stability ◽  
Center Of Pressure ◽  
Foot Pressure ◽  
Pressure System ◽  
Platform Motion ◽  
Postural Disturbance ◽  
Trunk Kinematics ◽  
Wave Induced ◽  
Lumbar Motion

The purpose of this study was to examine how wave-induced platform motion effects postural stability when handling loads. Twelve participants (9 male, 3 female) performed a sagittal lifting/lowering task with a 10 kg load in different sea conditions off the coast of Halifax, Nova Scotia, Canada. Trunk kinematics and foot center of force were measured using the Lumbar Motion Monitor and F-Scan foot pressure system respectively. During motion conditions, significant decreases in trunk velocities were accompanied by significant increases in individual foot center of pressure velocities. These results suggest that during lifting and lowering loads in moving environments, the reaction to the wave-induced postural disturbance is accompanied by a decrease in performance speed so that the task can be performed more cautiously to optimize stability.

scholarly journals Implementation and design of new low-cost foot pressure sensor module using piezoelectric sensor in T-FLoW humanoid robot

2019 ◽  
Vol 9 (1) ◽  
pp. 203
Author(s):  
R. Dimas Pristovani ◽  
Dewanto Sanggar ◽  
Pramadihanto Dadet
Keyword(s):  
Pressure Sensor ◽  
Humanoid Robot ◽  
Body Force ◽  
Center Of Pressure ◽  
Low Cost ◽  
Piezoelectric Sensor ◽  
Position Vector ◽  
Stream Data ◽  
Foot Pressure ◽  
Sensor Module

<span lang="EN-US">Basically, human can sense the active body force trough the soles of their feet and can feel the position vector of zero moment point (ZMP) based on the center of pressure (CoP) from active body force. This behavior is adapted by T-FLoW humanoid robot using unique sensor which is piezoelectric sensor. Piezoelectric sensor has a characteristic which is non-continuous reading (record a data only a moment). Because of it, this sensor cannot be used to stream data such as flex sensor, loadcell sensor, and torque sensor like previous research. Therefore, the piezoelectric sensor still can be used to measure the position vector of ZMP. The idea is using this sensor in a special condition which is during landing condition. By utilizing 6 unit of piezoelectric sensor with a certain placement, the position vector of ZMP (X-Y-axis) and pressure value in Z-axis from action body force can be found. The force resultant method is used to find the position vector of ZMP from each piezoelectric sensor. Based on those final conclusions in each experiment, the implementation of foot pressure sensor modul using piezoelectric sensor has a good result (94%) as shown in final conclusions in each experiment. The advantages of this new foot pressure sensor modul is low-cost design and similar result with another sensor. The disadvantages of this sensor are because of the main characteristic of piezoelectric sensor (non-continuous read) sometimes the calculation has outlayer data.</span>

Center of pressure excursion and muscle activation during gait initiation in individuals with and without chronic ankle instability

2020 ◽  
Vol 108 ◽  
pp. 109904
Author(s):  
Mohammad Yousefi ◽  
Heydar Sadeghi ◽  
Saeed Ilbiegi ◽  
Zahra Ebrahimabadi ◽  
Maryam Kakavand ◽  
...  
Keyword(s):  
Muscle Activation ◽  
Center Of Pressure ◽  
Ankle Instability ◽  
Chronic Ankle Instability ◽  
Gait Initiation

Static and Dynamic Plantar Pressure and Normalized Plantar Pressure Characteristics among Children, Adults, and the Elderly

2021 ◽  
Vol 104 (12) ◽  
pp. 1881-1887
Keyword(s):  
Young Adults ◽  
Plantar Pressure ◽  
Center Of Pressure ◽  
The Elderly ◽  
Quiet Standing ◽  
Foot Pressure ◽  
Gait Performance ◽  
Plantar Pressures ◽  
Balance Ability ◽  
Pressure Characteristics

Background: A better understanding of plantar pressure while standing and walking would help in improving balance and gait performance across different age ranges. Objective: To clarify the differences of plantar pressure while standing and walking among children, adults, and the elderly. Materials and Methods: Fifty-three participants including eleven aged 3 to 8 years, thirty aged 20 to 40 years, and twelve aged 60 to 90 years were included in the present study. Plantar pressure and related parameters while quiet standing and walking with self-selected speed were assessed. Results: In static plantar pressure, no significant differences were observed of mean different pressure and mean different contact area between dominant and non-dominant limbs among the three groups, while center of pressure (COP) displacement was shown as significantly greater between children and adults (p<0.05). For dynamic plantar pressure, no significant differences in COP velocity were found among the three groups. The elderly showed significant lower normalized maximum plantar pressure in areas of the second and third metatarsal, and internal heel compared with the young adults (p<0.05). Additionally, normalized maximum plantar pressures among children seemed to differ from adults. Conclusion: Plantar pressure characteristics could indicate that children develop gait ability in braking and propulsion phases with greater heel and toe function, while the ability of braking and propulsion declined with aging. These could reflect balance ability while standing or walking. Keywords: Foot pressure; Children; Elderly; Normalization

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