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The filtering of the posturographic signals shows the age related features.

Michalak KP, Przekoracka-Krawczyk A, Nawrot P, Woźniak P, Vieregge P - ScientificWorldJournal (2014)

Bottom Line: The statistically significant differences in the mutual dependence between x and y components between the groups of patients were analyzed using MANOVA.The significant differences were observed mainly in the range of filter frequencies f = 0.1-1.5 Hz and f = 2.2-5.5 Hz with a maximum effect at approximately 4-5 Hz.A detailed post-hoc analysis is also presented.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Vision Science and Optometry, Faculty of Physics, Adam Mickiewicz University of Poznań, Umultowska Street 85, 61-614 Poznań, Poland.

ABSTRACT

Objective: Lower frequencies of slow oscillations of the posturographic signals can be removed using high-pass filtering. This procedure releases postural reflexes possessing higher frequencies and lower amplitude range. Mutual dependence between the x and y components of posturographic signals was analyzed using principal component analysis (PCA). The posturographic signals of old patients with idiopathic gait disturbance were compared with the control group of similar age and with younger patients. There was also the analysis of the influence of the eyes state (open versus closed) and the head position (normal or bent back). The statistically significant differences in the mutual dependence between x and y components between the groups of patients were analyzed using MANOVA. The significant differences were observed mainly in the range of filter frequencies f = 0.1-1.5 Hz and f = 2.2-5.5 Hz with a maximum effect at approximately 4-5 Hz. A detailed post-hoc analysis is also presented. The differences in the higher frequency range suggest the main disturbance to be connected with the spinal reflexes. Visual and vestibular support appear insufficient for postural stability control in the idiopathic gait disturbance group. The results suggest that idiopathic gait disturbance is the final stage of the aging process of postural system.

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Related in: MedlinePlus

Analysis of the parameter s3. The figure shows the high statistical significance p of the main effect in MANOVA analysis for the factor “eyes/head state.” The very high significance is observed for every filter frequency used. The values for eyes closed (ECHN and ECHBB) are as a rule lower than for open eyes.
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fig8: Analysis of the parameter s3. The figure shows the high statistical significance p of the main effect in MANOVA analysis for the factor “eyes/head state.” The very high significance is observed for every filter frequency used. The values for eyes closed (ECHN and ECHBB) are as a rule lower than for open eyes.

Mentions: The significance of the observed differences was analyzed using ANOVA analysis. Two factors were analyzed: “patient groups” and “eyes/head position.” Figures 5–8 show the significance of differences in the logarithmic scale between successive groups and registration conditions for the variables s2 and s3. The lowest value in the OY axis “−15” refers to the significance being lower than P < 10−15.


The filtering of the posturographic signals shows the age related features.

Michalak KP, Przekoracka-Krawczyk A, Nawrot P, Woźniak P, Vieregge P - ScientificWorldJournal (2014)

Analysis of the parameter s3. The figure shows the high statistical significance p of the main effect in MANOVA analysis for the factor “eyes/head state.” The very high significance is observed for every filter frequency used. The values for eyes closed (ECHN and ECHBB) are as a rule lower than for open eyes.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4281402&req=5

fig8: Analysis of the parameter s3. The figure shows the high statistical significance p of the main effect in MANOVA analysis for the factor “eyes/head state.” The very high significance is observed for every filter frequency used. The values for eyes closed (ECHN and ECHBB) are as a rule lower than for open eyes.
Mentions: The significance of the observed differences was analyzed using ANOVA analysis. Two factors were analyzed: “patient groups” and “eyes/head position.” Figures 5–8 show the significance of differences in the logarithmic scale between successive groups and registration conditions for the variables s2 and s3. The lowest value in the OY axis “−15” refers to the significance being lower than P < 10−15.

Bottom Line: The statistically significant differences in the mutual dependence between x and y components between the groups of patients were analyzed using MANOVA.The significant differences were observed mainly in the range of filter frequencies f = 0.1-1.5 Hz and f = 2.2-5.5 Hz with a maximum effect at approximately 4-5 Hz.A detailed post-hoc analysis is also presented.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Vision Science and Optometry, Faculty of Physics, Adam Mickiewicz University of Poznań, Umultowska Street 85, 61-614 Poznań, Poland.

ABSTRACT

Objective: Lower frequencies of slow oscillations of the posturographic signals can be removed using high-pass filtering. This procedure releases postural reflexes possessing higher frequencies and lower amplitude range. Mutual dependence between the x and y components of posturographic signals was analyzed using principal component analysis (PCA). The posturographic signals of old patients with idiopathic gait disturbance were compared with the control group of similar age and with younger patients. There was also the analysis of the influence of the eyes state (open versus closed) and the head position (normal or bent back). The statistically significant differences in the mutual dependence between x and y components between the groups of patients were analyzed using MANOVA. The significant differences were observed mainly in the range of filter frequencies f = 0.1-1.5 Hz and f = 2.2-5.5 Hz with a maximum effect at approximately 4-5 Hz. A detailed post-hoc analysis is also presented. The differences in the higher frequency range suggest the main disturbance to be connected with the spinal reflexes. Visual and vestibular support appear insufficient for postural stability control in the idiopathic gait disturbance group. The results suggest that idiopathic gait disturbance is the final stage of the aging process of postural system.

Show MeSH
Related in: MedlinePlus