The Filtering of the Posturographic Signals Shows the Age Related Features

Michalak, Krzysztof Piotr; Przekoracka-Krawczyk, Anna; Nawrot, Piotr; Woźniak, Piotr; Vieregge, P.

doi:10.1155/2014/403893

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…According to the results of the present study, the patients with and without self-report KI differed regarding the indicators of the dynamic balance state with closed eyes, which is in line with the previous findings in this regard, which have demonstrated that vision plays a pivotal role in maintaining balance [29]. In addition to the present study, this phenomenon has been confirmed in patients with osteoarthritis in a previous research conducted by Truszczyńska-Baszak et al who limited the vision of KOA patients and observed that their postural control severely reduced, and training was required to maintain their balance control [30].…”

Section: Discussionsupporting

confidence: 92%

The effect of self-reported knee instability on plantar pressure and postural sways in women with knee osteoarthritis

et al. 2021

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Background Giving way and knee instability are common problems in patients with knee osteoarthritis, disrupting the daily activities and balance of the affected individual. The present study aimed to evaluate the postural control status of women with knee osteoarthritis with and without self-report knee instability (KI). Methods This cross-sectional, single-blind study was conducted on 57 female patients with knee osteoarthritis. The patients were selected based on the inclusion and exclusion criteria and divided into two groups of with KI (n = 26) and without KI (n = 31). Fear of movement was assessed using the Tampa questionnaire, the degree of knee instability was measured based on the Fitzgard scale, the static and dynamic balance of the subjects were evaluated with open and closed eyes using a Biodex balance device, and foot pressure distribution situation was measured using a FDM-S-Zebris device. Results Mean comparison showed a significant difference between the subjects with and without KI in static balance only in anterior–posterior direction with open eyes (p = 0.01) and closed eyes (p = 0.0001). In the dynamic balance test, the subjects in both groups had significant differences in terms of all the indicators of anterior–posterior stability (p = 0.001), medial–lateral stability (p = 0.0001), and overall stability (p = 0.0001) with closed eyes. However, no significant difference was observed with open eyes (p > 0.05). Multiple regression also indicated significant positive correlations between pain intensity and disease duration with the degree of KI (p < 0.05). Conclusions According to the results, there were significant differences between the mean pain scores, static and dynamic balance, and the rate of fall between the women with knee osteoarthritis with and without the KI index. Therefore, patients with knee osteoarthritis, which also has an index of KI, are more susceptible to falls, and proper strategies are required to reduce the level of KI in these patients.

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Section: Discussionsupporting

confidence: 92%

The effect of self-reported knee instability on plantar pressure and postural sways in women with knee osteoarthritis

et al. 2021

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“…The data obtained here confirms the earlier findings 17,21,40–44 that visual signals are crucial for control of body balance. The rate of stabilisation was higher, and stabilisation time longer when the eyes were closed compared with open eye conditions.…”

Section: Discussionsupporting

confidence: 92%

Computerised dynamic posturography for postural control assessment in subjects wearing multifocal contact lenses dedicated for myopia control

Przekoracka

Michalak

Olszewski³

et al. 2021

Ophthalmic Physiologic Optic

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Purpose To measure body balance using computerised dynamic posturography in young adults wearing multifocal contact lenses (MFCL) with high addition powers designed for myopia control. Methods Twenty‐four young adults (mean age: 24 years) wearing distance‐centred soft MFCL (SwissLens Orbis Relax) with two different central zones (3 and 4.5 mm), two addition powers (+2 D, +4 D) and single vision control lenses. Body balance was measured on a moving platform under three viewing conditions: (1) eyes open when fixating on letters at 3 m or (2) at 40 cm, as well as (3) with the eyes closed. Parameters of body stabilisation were analysed: the rate of body stabilisation (τrelax), the stabilisation time (Tmax) and the number of oscillations (Nosc). Results The MFCLs did not produce a significant difference in the mean values of the analysed parameters (p > 0.05 for τrelax, Tmax, Nosc). However, a positive correlation was found between pupil size and Nosc and Tmax (p < 0.01), suggesting an effect of the +4 D add with the 3 mm central zone on the posturographic parameters. As was expected, dynamic body stabilisation was better with eyes open versus eyes closed (p < 0.005). Conclusions Distance‐centred MFCLs with a medium addition (+2 D) do not disturb body stabilisation in young adults. However, high additions (+4 D) with a small central zone may affect body balance control in subjects with large pupil size.

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“…Similar to other organs, the human postural control system undergoes the ageing process [20, 21]. Young persons are able to perform balance with relative good efficiency even when excluding visual and vestibular input and while performing mental tasks which reduce the influence of conscious attention.…”

Section: Introductionmentioning

confidence: 99%

Parameters of the crossing points between center of pressure and center of mass signals are potential markers of postural control efficiency

2019

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Posturographic signals were recorded for 384 subjects of different ages and with old persons with gait disturbances. Four conditions were used: Eyes Open/Closed vs. Head Normal/Bent Back. ‘Center of Pressure’ (CoP) signals were decomposed into ‘Center of Mass’ (CoM) and the remaining difference between Center of Pressure and Center of Mass (CoPM). The Zero-Crossing points in which the Center of Mass and Center of Pressure paths cross each other have been extracted. Velocity of CoM, velocity of CoPM and acceleration of CoPM in Zero-Crossing points were analyzed to be potential markers of balance efficiency. Three factors causing the deterioration of balance quality were analyzed: closing eyes, bending the head back and patient age. The influence of the given factors was measured using the significance p of the t-Student test and Cohen's d effect size and applied to differences for the logarithms of three of the mentioned above variables measured without and with the given deteriorating factor. In the majority of comparisons, the proposed new parameters of balance quality possessed higher statistical power to detect deteriorated balance quality than the standard parameters: standard deviation of the signal and ellipse area covering 90% of the signal envelope. Most valuable are the velocity and acceleration of CoPM for the medio-lateral direction. Logarithms of the analyzed parameters are proposed to be used in analyses because they possess normal or close to normal distribution and they are less sensitive to single high values occurring often in measurements.

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The Filtering of the Posturographic Signals Shows the Age Related Features

Cited by 7 publications

References 22 publications

The effect of self-reported knee instability on plantar pressure and postural sways in women with knee osteoarthritis

The effect of self-reported knee instability on plantar pressure and postural sways in women with knee osteoarthritis

Computerised dynamic posturography for postural control assessment in subjects wearing multifocal contact lenses dedicated for myopia control

Parameters of the crossing points between center of pressure and center of mass signals are potential markers of postural control efficiency

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