Parameter Reduction in the Frequency Analysis of Center of Pressure in Stabilometry

Nagymáté, Gergely; Kiss, Rita M.

doi:10.3311/ppme.8999

Cited by 17 publications

(8 citation statements)

References 34 publications

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“…Usually, the frequency type parameters yielded poor reliability. As described by [ 26 ], the frequency of the largest amplitudes in the CoP motions is inconsistent. However, these large motions will result in the highest power frequency bins in the spectrum.…”

Section: Discussionmentioning

confidence: 99%

“…To reduce the large number of CoP parameters, Nagymáté and Kiss studied many of them with correlation analysis and variance analysis in different standing conditions to select the independent CoP parameters that are sufficiently sensitive to show the differences between the different standing conditions [ 25 , 26 ]. The authors recommended the time-distance and frequency parameters as independent CoP parameter sets presented in Table 1 .…”

Section: Introductionmentioning

confidence: 99%

“…On the basis of the literature, the present paper aims to evaluate the test-retest reliability of the independent time-distance and frequency-based CoP parameters that are recommended as a conclusion of correlation analyses in [ 25 , 26 ]. The bipedal stance with the eyes open (EO), eyes closed (EC) and stance on the dominant leg (SL) were involved in our measurement protocols, and the reliability of the parameters was determined for both 30- and 60-second sampling intervals with repeated standing trials of healthy young participants on a force distribution plate.…”

Section: Introductionmentioning

confidence: 99%

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Reliability analysis of a sensitive and independent stabilometry parameter set

2018

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Recent studies have suggested reduced independent and sensitive parameter sets for stabilometry measurements based on correlation and variance analyses. However, the reliability of these recommended parameter sets has not been studied in the literature or not in every stance type used in stabilometry assessments, for example, single leg stances. The goal of this study is to evaluate the test-retest reliability of different time-based and frequency-based parameters that are calculated from the center of pressure (CoP) during bipedal and single leg stance for 30- and 60-second measurement intervals. Thirty healthy subjects performed repeated standing trials in a bipedal stance with eyes open and eyes closed conditions and in a single leg stance with eyes open for 60 seconds. A force distribution measuring plate was used to record the CoP. The reliability of the CoP parameters was characterized by using the intraclass correlation coefficient (ICC), standard error of measurement (SEM), minimal detectable change (MDC), coefficient of variation (CV) and CV compliance rate (CVCR). Based on the ICC, SEM and MDC results, many parameters yielded fair to good reliability values, while the CoP path length yielded the highest reliability (smallest ICC > 0.67 (0.54–0.79), largest SEM% = 19.2%). Usually, frequency type parameters and extreme value parameters yielded poor reliability values. There were differences in the reliability of the maximum CoP velocity (better with 30 seconds) and mean power frequency (better with 60 seconds) parameters between the different sampling intervals.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reliability analysis of a sensitive and independent stabilometry parameter set

2018

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“…In the literature, postural sway is often analysed using a force distribution measuring plate, which provides the two-dimensional wandering of the CoP in the AP and the ML directions [13,[33][34][35], which is then used to define stabilometry parameters [36][37][38]. In case of a uniaxial balance board, oscillations in ML direction are negligible compared to the those in the AP direction, consequently, the balancing task can be described as a one-dimensional motion.…”

Section: Stabilometry Parametersmentioning

confidence: 99%

Parametric Study of Changes in Human Balancing Skill by Repeated Balancing Trials on Rolling Balance Board

Molnar

Insperger

2020

Period. Polytech. Mech. Eng.

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Dynamic balance conditions were realized by asking eight volunteers to stand on uniaxial balance board with adjustable geometry and to carry out 60 s long balancing trials. Four different balance board geometry were used, each associated with different difficulty level. Balancing trials were repeated five times weekly (learning period) in order to test improvement of balancing skill. The measurement was repeated eight weeks after the learning period in order to check the persistence of the balancing skill (confirmation session). Oscillations of ankle angle and hip angle were monitored by OptiTrack motion capture system and four stabilometry parameters were used to characterize improvement in balancing performance, namely, Standard Deviation (STD), Largest Amplitude (LA), Normalized Path Length (NPL) and Mean Power Frequency (MPF). STD and NPL show similar tendency to the preliminary expectations, therefore they can be considered as good measures to describe balancing performance. Results show that subjects used ankle strategy for the less difficult balance board configurations, while for the more difficult tasks, hip strategy was also involved. Changes in STD and NPL during the learning period showed that the improvement and the persistence in balancing skill is more significant for more difficult balancing tasks.

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“…Many different parameters can be found in the literature to characterize the performance during balancing tasks, such as mean power frequency, median frequency, frequency range power ratios, spectral power AP-ML ratio, largest amplitude and corresponding largest frequency, just to mention a few [29,30]. In a previous work of the authors [23], the standard deviation of the balance board angle was used as a measure of balancing skill.…”

Section: Stabilometrymentioning

confidence: 99%

Mechanical Model for Human Balancing on Rolling Balance Board

Molnar

Zelei

Insperger

2018

APP

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A two-degree-of-freedom mechanical model was developed to analyze human balancing on rolling balance board in the frontal plane. The human nervous system is modeled as a proportionalderivative controller with constant feedback delay. The radius R of the wheels and the board distance h measured from the center of the wheel are adjustable parameters. Simulation results using the mechanical model were compared with real balancing trials recorded by an OptiTrack motion capture system. The goal of the paper is to investigate whether the two-degree-of-freedom model is accurate enough to model the balancing task and to introduce a stabilometry parameter in order to characterize balancing skill in case of different set of R and h. The conclusion is that the angle of the upper body and the angle of the head also play an important role in the balancing process therefore a three- or four-degree-of-freedom model is more appropriate.

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Parameter Reduction in the Frequency Analysis of Center of Pressure in Stabilometry

Cited by 17 publications

References 34 publications

Reliability analysis of a sensitive and independent stabilometry parameter set

Reliability analysis of a sensitive and independent stabilometry parameter set

Parametric Study of Changes in Human Balancing Skill by Repeated Balancing Trials on Rolling Balance Board

Mechanical Model for Human Balancing on Rolling Balance Board

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