{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,16]],"date-time":"2025-10-16T20:24:35Z","timestamp":1760646275564,"version":"3.37.3"},"reference-count":22,"publisher":"Wiley","license":[{"start":{"date-parts":[[2014,1,1]],"date-time":"2014-01-01T00:00:00Z","timestamp":1388534400000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["The Scientific World Journal"],"published-print":{"date-parts":[[2014]]},"abstract":"<jats:p><jats:italic>Objective<\/jats:italic>. 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<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M1\"><mml:mrow><mml:mi>x<\/mml:mi><\/mml:mrow><\/mml:math>and<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M2\"><mml:mrow><mml:mi>y<\/mml:mi><\/mml:mrow><\/mml:math>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<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M3\"><mml:mrow><mml:mi>x<\/mml:mi><\/mml:mrow><\/mml:math>and<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M4\"><mml:mrow><mml:mi>y<\/mml:mi><\/mml:mrow><\/mml:math>components between the groups of patients were analyzed using MANOVA. The significant differences were observed mainly in the range of filter frequencies<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M5\"><mml:mi>f<\/mml:mi><mml:mo>=<\/mml:mo><mml:mn fontstyle=\"italic\">0.1<\/mml:mn><mml:mtext>\u2013<\/mml:mtext><mml:mn fontstyle=\"italic\">1.5<\/mml:mn><\/mml:math>\u2009Hz and<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M6\"><mml:mi>f<\/mml:mi><mml:mo>=<\/mml:mo><mml:mn fontstyle=\"italic\">2.2<\/mml:mn><mml:mtext>\u2013<\/mml:mtext><mml:mn fontstyle=\"italic\">5.5<\/mml:mn><\/mml:math>\u2009Hz with a maximum effect at approximately<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M7\"><mml:mn fontstyle=\"italic\">4<\/mml:mn><mml:mtext>-<\/mml:mtext><mml:mn fontstyle=\"italic\">5<\/mml:mn><\/mml:math>\u2009Hz. 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.<\/jats:p>","DOI":"10.1155\/2014\/403893","type":"journal-article","created":{"date-parts":[[2014,12,18]],"date-time":"2014-12-18T11:00:14Z","timestamp":1418900414000},"page":"1-9","source":"Crossref","is-referenced-by-count":8,"title":["The Filtering of the Posturographic Signals Shows the Age Related Features"],"prefix":"10.1155","volume":"2014","author":[{"given":"Krzysztof Piotr","family":"Michalak","sequence":"first","affiliation":[{"name":"Laboratory of Vision Science and Optometry, Faculty of Physics, Adam Mickiewicz University of Pozna\u0144, Umultowska Street 85, 61-614 Pozna\u0144, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2401-4135","authenticated-orcid":true,"given":"Anna","family":"Przekoracka-Krawczyk","sequence":"additional","affiliation":[{"name":"Laboratory of Vision Science and Optometry, Faculty 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