People with persistent postural-perceptual dizziness demonstrate altered postural strategies in complex visual and cognitive environments

BACKGROUND: People with PPPD report imbalance, increase in symptoms and impaired function within complex visual environments, but understanding of the mechanism for these behaviors is still lacking. OBJECTIVE: To investigate postural control in PPPD we compared changes in center of pressure (COP) and head kinematics of people with PPPD (N = 22) and healthy controls (N = 20) in response to different combinations of visual and cognitive perturbations during a challenging balance task. METHODS: Participants stood in a tandem position. Static or moving stars (0.2 Hz, 5 mm or 32 mm amplitude, anterior-posterior direction) were displayed through a head-mounted display (HTC Vive). On half the trials, participants performed a serial-3 subtraction task. We measured medio-lateral and anterior-posterior path and acceleration of COP and head. RESULTS: Controls significantly increased all COP and head parameters with the cognitive task whereas PPPD increased only COP ML path and acceleration. Only controls significantly increased head anterior-posterior & medio-lateral acceleration with moving visual load. Cognitive task performance was similar between groups. CONCLUSIONS: We observed altered postural strategies in people with PPPD, in the form of reduced movement with challenge, particularly around the head segment. The potential of this simple and portable head-mounted display setup for differential diagnosis of vestibular disorders should be further explored.

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Single-Leg Balance Performance in Sub-Elite Young Soccer Players and Swimmers as a Function of Age and Sports Experience

Journal of Motor Learning and Development ◽

10.1123/jmld.2018-0055 ◽

2019 ◽

Vol 7 (3) ◽

pp. 374-388 ◽

Cited By ~ 1

Author(s):

Peter Leinen ◽

Thomas Muehlbauer ◽

Stefan Panzer

Keyword(s):

Center Of Pressure ◽

Dynamic Balance ◽

Age Groups ◽

Force Plate ◽

Soccer Players ◽

Functional Specialization ◽

Balance Performance ◽

Balance Test ◽

Balance Task ◽

Anterior Posterior

The present study investigated if accumulated, advanced, regular soccer practice (balance-demanding exercise) compared to regular swim practice (non-balance–demanding exercise) induces a more pronounced functional specialization in postural control. Therefore, single-leg balance performance in sub-elite young soccer players (under 13 [U13]: n = 16; U15: n = 18; U19: n = 15), and sub-elite young swimmers (U13: n = 7; U15: n = 4; U19: n = 5) was tested in different balance task conditions (i.e., static and dynamic balance on firm and foam surface). All athletes practiced 3–10 times per week. Single-leg balance of the dominant and non-dominant leg was measured using a force plate. The standard deviation of the center of pressure displacements in anterior-posterior and medio-lateral directions were used as dependent variables. Irrespective of age groups and type of sport, the results failed to indicate significant leg differences in single-leg balance performance. The soccer players showed significant better single-leg balance performance in anterior-posterior direction in the dynamic balance test on the firm and foam surface compared to the swimmers. Functional specialization was accompanied by the type of sport but not by accumulated practice.

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Hip Sway in Patients With Hip Osteoarthritis During One-Leg Standing With a Focus on Time Series Data

Motor Control ◽

10.1123/mc.2020-0055 ◽

2021 ◽

pp. 1-17

Author(s):

Takuya Ibara ◽

Makoto Takahashi ◽

Koichi Shinkoda ◽

Mahito Kawashima ◽

Masaya Anan

Keyword(s):

Time Series ◽

Center Of Pressure ◽

Hip Osteoarthritis ◽

Series Data ◽

Scaling Exponent ◽

Balance Performance ◽

Kinematic Parameters ◽

Lateral Direction ◽

Posterior Direction ◽

Anterior Posterior

This study aimed to investigate the hip sway and the relationship between the center of pressure (CoP) and kinematic parameters regarding the time series scaling component α in patients with hip osteoarthritis (OA) during a one-leg standing task. The scaling exponent α, SD, hip sway maximal acceleration change, and balance performance, which was measured using CoP parameters, were compared between hip OA and control groups during a one-leg standing task. The relationships between balance performance with CoP parameters and kinematic parameters were investigated with the regression analysis. In the hip OA group, the scaling exponent α was smaller in the medial–lateral direction, and the SD and maximal amount of change in hip sway acceleration were larger in the anterior–posterior direction in the hip OA group. In this group, the CoP parameters were significantly associated with α in the medial–lateral direction (negatively) and in the anterior–posterior direction (positively). In the hip OA group, hip sway adaptability in the medial–lateral direction was limited, while the anterior–posterior direction showed greater movement.

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Vibration-Induced Postural Posteffects

Journal of Neurophysiology ◽

10.1152/jn.1998.79.1.143 ◽

1998 ◽

Vol 79 (1) ◽

pp. 143-150 ◽

Cited By ~ 93

Author(s):

M. M. Wierzbicka ◽

J. C. Gilhodes ◽

J. P. Roll

Keyword(s):

Center Of Pressure ◽

Mechanical Vibration ◽

Free Standing ◽

Isotonic Condition ◽

Involuntary Contraction ◽

After Effect ◽

Posterior Direction ◽

Low Amplitude ◽

Spatially Oriented ◽

Anterior Posterior

Wierzbicka, M. M., J. C. Gilhodes, and J. P. Roll. Vibration-induced postural posteffects. J. Neurophysiol. 79: 143–150, 1998. It generally is known that vibration of various muscles in free-standing subjects evokes a spatially oriented postural response. Furthermore, it recently has been shown that when a vibratory stimulus is terminated, a powerful involuntary contraction of the previously vibrated muscle often occurs that, under the isotonic condition, is accompanied by movement of a limb. The aim of this study was to explore effects of a low-amplitude mechanical vibration, applied in a seated position, on the standing posture. The 30-s vibration was applied bilaterally at the ankle level to anterior or posterior tendons and at the cervical level in front or back of the neck, at one site only at a time. Center of pressure trajectories were monitored during quiet stance for ≤19 min after the offset of vibration, and these measurements were compared with a previbration control trial. The results clearly indicate that vibration produced in all subjects strong, long-lasting dynamical modification of posture mainly in the anterior-posterior direction. Spatial orientation of the induced postvibratory shift in posture was dependent on the vibration side. We conclude that sustained Ia sensory inflow, evoked by vibration, has a powerful after-effect on the motor system at the postural level.

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Effect of shoes with rounded soft soles in the anterior–posterior direction on the center of pressure during static standing

The Foot ◽

10.1016/j.foot.2015.02.004 ◽

2015 ◽

Vol 25 (2) ◽

pp. 97-100 ◽

Cited By ~ 1

Author(s):

Tomohiro Demura ◽

Shin-ichi Demura ◽

Masanobu Uchiyama ◽

Tamotsu Kitabayashi ◽

Kenji Takahashi

Keyword(s):

Center Of Pressure ◽

Posterior Direction ◽

Anterior Posterior

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The center of pressure progression characterizes the dynamic function of high-arched feet during walking

Journal of Leather Science and Engineering ◽

10.1186/s42825-019-0016-6 ◽

2020 ◽

Vol 2 (1) ◽

Author(s):

Bo Li ◽

Qipeng Xiang ◽

Xianyi Zhang

Keyword(s):

Center Of Pressure ◽

Clinical Intervention ◽

Mean Velocity ◽

Gait Characteristics ◽

Risk Of Injury ◽

Dynamic Function ◽

Posterior Direction ◽

The Mean ◽

Two Phases ◽

Anterior Posterior

Abstract Background The medial longitudinal arch height has an effect on kinetic parameters during gait and might be related to the risk of injury. For the assessment of foot structures, the center of pressure (COP) trajectory is a more reliable and practical parameter than plantar pressure. This study aimed to clarify the COP trajectory and velocity characteristics in the medial-lateral and anterior-posterior direction of individuals with a high-arched foot during barefoot walking. Methods Sixty-two healthy young adults were asked to walk over a Footscan pressure plate to record the COP parameters during the stance phase of walking. Results Compared to normal arched feet, the COP during forefoot contact and foot flat phases of high-arched feet shifted anteriorly (19.9 mm and 15.1 mm, respectively), and the mean velocity of COP in anterior-posterior direction decreased by 0.26 m/s and increased by 0.044 m/s during these two phases respectively. Conclusions The findings of this study suggest that the displacement and velocity of COP in anterior-posterior direction was different between high-arched and normal-arched subjects during barefoot walking, which can be used for the assessment of gait characteristics for high-arched individuals. The results of this study may provide insights into modifying clinical intervention for individuals with high-arched feet to enhance rehabilitation and prevent injuries and have implications for assessing the design of footwear and foot orthotics. Graphical abstract

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Postural Preparation to Stepping: Coupled Center of Pressure Shifts in the Anterior-Posterior and Medio-Lateral Directions

Journal of Human Kinetics ◽

10.1515/hukin-2016-0030 ◽

2016 ◽

Vol 54 (1) ◽

pp. 5-14 ◽

Cited By ~ 4

Author(s):

Clint Hansen ◽

Jacques LaRue ◽

Manh-Cuong Do ◽

Mark L. Latash

Keyword(s):

Center Of Pressure ◽

Initial Conditions ◽

Force Plate ◽

Single Step ◽

The Body ◽

Lateral Direction ◽

Postural Adjustments ◽

Neural Organization ◽

Posterior Direction ◽

Anterior Posterior

AbstractWe explored changes in the postural preparation to stepping introduced by modifications of the initial coordinates of the center of pressure (COP). We hypothesized that the postural adjustments in the anterior-posterior direction would persist across all initial COP manipulations while the adjustments in the medio-lateral direction would be highly sensitive to the initial COP coordinate. Healthy subjects stood on a force plate, shifted the body weight to one of the initial conditions that spanned the range of COP coordinates in both directions, and initiated a single step or started to walk. No major changes were observed between the stepping and walking conditions. Changes in the initial COP coordinate in the medio-lateral direction led to scaling of the magnitude of the COP shift in that direction prior to stepping accompanied by a nearly proportional change in the COP shift in the anterior-posterior direction. Changes in the initial COP coordinate in the anterior-posterior direction led to scaling of the magnitude of the COP shift in that direction prior to stepping without consistent changes in the COP shift in the medio-lateral direction. We interpret the results as reflecting a neural organization using a small set of referent body configurations for the postural adjustments.

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The effects of leg preference and leg dominance on static and dynamic balance performance in highly-trained tennis players

PLoS ONE ◽

10.1371/journal.pone.0259854 ◽

2021 ◽

Vol 16 (11) ◽

pp. e0259854

Author(s):

Žiga Kozinc ◽

Nejc Šarabon

Keyword(s):

Center Of Pressure ◽

Dynamic Balance ◽

Stability Index ◽

Static Balance ◽

Balance Performance ◽

Tennis Players ◽

Balance Task ◽

Time To Stabilization ◽

Leg Dominance ◽

Anterior Posterior

In this study, 90 (51 males, 39 females) tennis players performed single-leg quiet stance and single-leg landing tasks. For the static standing task, center-of pressure (CoP) velocities, amplitudes, frequency and area were calculated. For the landing tasks, time to stabilization as well as dynamic postural stability index were considered. The analysis of differences between the legs was done based on two methods for a priori determination of leg preference, one based on the preference of kicking a ball and one based on the preference for single-leg jumping. An additional analysis was done based on the leg dominance (determined post hoc), based on the observed performance of the tasks. In case of the classification based on kicking a ball, there was a statistically significantly lower CoP anterior-posterior velocity and anterior-posterior amplitude in static balance task (p ≤ 0.017; 0.17 ≤ d ≤ 0.28) for the preferred leg. The CoP frequency was higher in the preferred leg for both directions (p ≤ 0.002; 0.10 ≤ d ≤ 0.22). For the landing task, CoP medial-lateral time to stabilization was statistically significantly shorter for the preferred leg (0.28 ± 0.38 s) compared to the non-preferred leg (0.47 ± 0.60 s) (p = 0.012; d = 0.38). There were no differences between the legs for the landing task. Moreover, there were no differences between the legs when we used the preference based on jumping for either of the tasks (d ≤ 0.14). The differences between legs in terms of observed dominance were larger than the differences based on the preference, which stresses the need for clear distinction of limb preference and limb dominance in research and practice. Regarding the effect of leg preference, small differences in static balance may exist between the legs (when the preference is based on kicking a ball).

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The efficiency of gait plate insole for children with in-toeing gait due to femoral antetorsion

Prosthetics and Orthotics International ◽

10.1177/0309364616631349 ◽

2016 ◽

Vol 41 (1) ◽

pp. 51-57 ◽

Cited By ~ 1

Author(s):

Sahar Ganjehie ◽

Hassan Saeedi ◽

Behshid Farahmand ◽

Sarah Curran

Keyword(s):

Center Of Pressure ◽

Lateral Displacement ◽

Femoral Anteversion ◽

Femoral Antetorsion ◽

Posterior Displacement ◽

Significant Difference ◽

Quasi Experimental ◽

Posterior Direction ◽

Walking Tests ◽

Anterior Posterior

Background:One of the most common gait disorders in children is in-toeing. Few studies have examined the efficacy gait plate insole in in-toeing. we used more precise apparatus than previous studies.Objectives:The aim of this study was to investigate the immediate effect of gait plate insole on the angle of gait and center of pressure displacement in children with in-toeing gait.Study design:Quasi-experimental before -after study.Methods:The angle of gait and center of pressure displacement were measured in 17 children aged 4–10 years with in-toeing gait. The RS scan pressure platform was employed to perform walking tests in three conditions including barefoot, with shoes only, and gait plate insole with shoes.Results:The gait plate insole with shoes as well as shoes alone produced a significant 11.1° and 3.85° increase in the angle of gait in in-toeing children respectively ( p < 0.05). The medial–lateral displacement of center of pressure showed a significant difference (3 mm) in shoes only condition when compared with barefoot condition. The shoes only and gait plate insole compared with barefoot condition increased the anterior–posterior displacement by 28 and 30 mm respectively.Conclusion:The gait plate insole with ordinary shoes and shoes only were able to increase angle of gait and the center of pressure displacement in the anterior–posterior direction in children with in-toeing gait due to excessive femoral anteversion.Clinical relevanceThe use of a gait plate insole inserted in ordinary shoes can improve gait appearance in children with in-toeing gait caused by Excessive femoral anteversion.

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