An application of mathematical models in posturography

Kodde, L.; Caberg, H; Mol, J.M.F.; Massen, C. H.

doi:10.1016/0141-5425(82)90025-5

Cited by 15 publications

(5 citation statements)

References 2 publications

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“…Taking center of pressure data to describe the motion of the center of mass would thus be significantly erroneous in swaying frequencies exceeding this value. Valk-Fai (1973) and Kodde et al (1982) have also shown, by comparing the directly measured movement of the center of mass to the resulting trajectory of the center of pressure, the existence of a significant difference between these two quantities. Smith (1957) and Kapteyn (1973) have suggested that kinematics of the swaying body, namely the acceleration of its center of mass, should be related to the actual forces acting on the foot supports.…”

Section: Introductionmentioning

confidence: 92%

“…(a) Above 5 Hz (Smith 1957;Thomas and Whitney 1959;Seliktar et al 1978;Dietz et al 1980;Soames and Atha 1980); (b) 0.5-5 Hz (Smith 1957;Gurfinkel 1973;ValkFai 1973;Yamamoto 1979a;Soames and Atha 1980;Kodde et al 1982;Shimba 1983Shimba , 1984Era and Heikkinen 1985); (c) Below 0.5 Hz (Thomas and Whitney 1959;Lestienne et al 1977;Seliktar et al 1978;Koozekanani et al t980).…”

Section: Introductionmentioning

confidence: 96%

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Bi-lateral reactive force patterns in postural sway activity of normal subjects

Mizrahi

Susak

1989

Biol. Cybern.

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Postural activity of normal subjects while standing still, as measured via the reactive foot-ground reactive forces, was investigated separately for each of the supporting legs, to provide detailed information on the individual activity of each side. Such information is not accessible if the overall reactive forces on the whole body are measured instead. Twenty-three normal adult subjects (average age 41 years) took part in the measuring tests, which were made on two collaterally installed force platforms. From the force traces obtained, the following parameters were determined: timings and amplitudes of the waveforms, separately for each foot and sequence of the force vectors on both feet and in relation to each other. Weight-bearing imbalance was defined in the vertical direction to express the difference between the average forces supported by each of the legs. Two parameters were defined by combining the force results obtained on each of the legs in the horizontal plane: sway total activity, representing the resultant of the added vector-norms in the anteroposterior and mediolateral directions, respectively; and asymmetry, representing the resultant of the subtracted above vector norms. The results indicated that, although the force traces were synchronous to each other, different vectorial force patterns were found, indicating different levels of stabilizing activities on each of the legs. This was also demonstrated by the fact that sway total activity was found considerably higher than the net reactive forces acting on the whole body during sway.(ABSTRACT TRUNCATED AT 250 WORDS)

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 96%

Bi-lateral reactive force patterns in postural sway activity of normal subjects

Mizrahi

Susak

1989

Biol. Cybern.

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“…Since the mid-19th century, various methods of post urographic measurement [1,4,6,12,19], different biomathematical models [9,17,20] and many interesting experimental approaches in order to elucidate stabilizing and destabilizing effects on upright posture have been the subject of intensive research [7,8,10,16,20].…”

Section: Discussionmentioning

confidence: 99%

Stabilizing and Destabilizing Effects of Vision and Foot Position on Body Sway of Healthy Young Subjects: A Posturographic Study

et al. 1989

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A total of 800 posturographic measurements – each characterized by four values (sway path, sway area, anteroposterior sway and lateral sway) – was carried out for this study. Eight different conditions (interfoot distances of 0, 4, 10 and 20 cm, each with eyes open and eyes closed) were compared by statistical means. All sway values were diminished by vision in small interfoot distances. At large interfoot distances, however, the presence of visual control resulted in an increase of lateral sway. Comparing the different foot positions, an increase of anteroposterior sway and a decrease of all other components were found at large interfoot distances no matter whether the eyes were open or closed.

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“…(a) Above 5 Hz (Smith 1957, Thomas and Whitney 1959, Seliktar e t al 1978, Dietz er al 1980, Soames and Atha 1980; (b) 0.5-5 Hz (Smith 1957, Gurfinkel 1973, Valk-Fai 1973, Yamamoto 1979, Soames and Atha 1980, Kodde et al 1982, Shimba 1983, 1984, Era and Heikkinen 1985;…”

Section: Introductionmentioning

confidence: 99%

On an analogue of Hardy's inequality for the Walsh-Fourier

Голубов¹

2001

Izv. Math.

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Bi-lateral force measurements on the supporting limbs in postural sway while standing still were carried out to evaluate postural stability of craniocerebral injured (CCI) patients. Brain pathology of these patients was characterised by CT scans and MRI, as well as by their cognitive and behavioural disturbances. Normal subjects of the same age group were tested as controls. From the force tracings obtained, three oscillation frequencies were identified, with orders of magnitudes of 6, 1.5 and 0.1 Hz, respectively, of which the middle frequency, i.e. that corresponding to 1.5 Hz, was selected for subsequent processing and analysis, which included the determination of relative sequence of the force vectors on both feet and evaluation of timings and amplitudes of the waveforms. Weight-bearing imbalance was defined in the vertical direction to express the difference between the average forces supported by each of the legs. In the horizontal plane, two parameters were defined: Sway Total Activity (sii), to represent the vector summation of the absolute values of the horizontal force components acting on both legs; and Asymmetry (ASYM), to express the difference in activities between the two legs. The results presented disclose the reactive force patterns acting on each of the legs of CCI individuals, in comparison with normal individuals. Although the'forces were shown to act synchronously on both legs, in most of the patients, they appeared to be asymmetrical in nature, with a typical vectorial pattern for every individual, which generally differed from that of normal subjects. Sway activity was found to be significantly higher in the CCI group as compared with that of the normal controls. These results justify the necessity to study the activity of each of the legs, rather than that corresponding to the resultant forces acting on the whole body, when treating the external forces involved in the stabilisation and regulation of the standing posture of these patients. An attempt to grade the patients according to ascending order of neurological deficits disclosed that their sway disturbances, as revealed by the magnirude of sway total activity and asymmetry, had a tendency to be related to the severity of neurobehavioural disturbances.

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An application of mathematical models in posturography

Cited by 15 publications

References 2 publications

Bi-lateral reactive force patterns in postural sway activity of normal subjects

Bi-lateral reactive force patterns in postural sway activity of normal subjects

Stabilizing and Destabilizing Effects of Vision and Foot Position on Body Sway of Healthy Young Subjects: A Posturographic Study

On an analogue of Hardy's inequality for the Walsh-Fourier

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