| 1. |
- Enbom, Håkan, et al.
(författare)
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Postural compensation in children with congenital or early acquired bilateral vestibular loss
- 1991
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Ingår i: Annals of Otology, Rhinology and Laryngology. - : SAGE Publications. - 0003-4894 .- 1943-572X. ; 100:6, s. 472-478
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Tidskriftsartikel (refereegranskat)abstract
- The relative roles of different receptor systems in compensating for vestibular loss were studied in 18 children (12 to 16 years of age) with congenital or early acquired bilateral vestibular loss (BVL) and impaired hearing, and compared to that in 33 normal children (9 to 16 years of age). Postural stability was studied with posturography evaluating the velocity of anterior-posterior body sway. With closed eyes the increase of sway velocity did not differ between the groups, either with or without simultaneous proprioceptive disturbances when the subjects were standing on a bare surface. Body sway velocities were found to increase more in subjects with a BVL than in normal children when subjects were standing on foam rubber. When proprioceptive cues were disturbed, body sway velocities increased in both groups, but significantly more in children with BVL when subjects stood on foam rubber. This occurred both with and without open eyes.
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| 2. |
- Enbom, Håkan, et al.
(författare)
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Presentation of a posturographic test with loading of the proprioceptive system
- 1988
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Ingår i: Acta Oto-Laryngologica, Supplement. - 0365-5237. ; 455, s. 58-61
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Postural control is maintained by sensory feedback from visual, vestibular and somatosensory receptors. Recently several methods for evaluating postural control have been devised, utilizing an imposed perturbation. Most of these methods use stimuli which simultaneously affect more than one of the sensory feedback loops. In the present paper a posturographic technique is presented with specific loading of the proprioceptive system, using a computer controlled vibratory stimulus and computerized analysis of the results.
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| 3. |
- Magnusson, M, et al.
(författare)
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Clinical considerations concerning horizontal optokinetic nystagmus
- 1988
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Ingår i: Acta Oto-Laryngologica, Supplement. - 0365-5237. ; 455, s. 7-53
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- During recent decades a vast amount of literature concerning horizontal optokinetic nystagmus has emerged, regarding which--and especially as regards our own work--this report is intended to consider the clinical value of optokinetic nystagmus.
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| 4. |
- Magnusson, Måns, et al.
(författare)
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Significance of Pressor Input from the Human Feet in Anterior-Posterior Postural Control. The Effect of Hypothermia on Vibration-Induced Body-Sway
- 1990
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Ingår i: Acta Oto-Laryngologica. - : Informa UK Limited. - 0001-6489 .- 1651-2251. ; 110:3-4, s. 8-182
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Tidskriftsartikel (refereegranskat)abstract
- The importance to postural control of the mechanoreceptors of the soles was investigated in thirteen healthy subjects. Body-sway velocity was evaluated before and after exposing the subject's feet to hypothermia, and when calf muscles were exposed to vibration at frequencies between 20 and 100 Hz. Subjects were tested both with eyes open and closed. Body-sway velocity was found to increase significantly during hypothermia of the feet. The difference in body-sway between hypothermal and normothermal conditions was less prominent when the subject's eyes were open though the difference was significant in both cases. The present results indicate the importance of the mechanoreceptors of the soles to postural control and elucidate their interaction with compensatory visual input in maintaining postural control. These findings also suggest, that factors affecting pressor input should be taken into consideration when assessing patients with complaints of dysequilibrium.
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| 5. |
- Magnusson, M, et al.
(författare)
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Significance of Pressor Input from the Human Feet in Lateral Postural Control. The Effect of Hypothermia on Galvanically Induced Body-Sway
- 1990
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Ingår i: Acta Oto-Laryngologica. - 0001-6489. ; 110:5-6, s. 7-321
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Tidskriftsartikel (refereegranskat)abstract
- The significance to human postural control of pressor information from the feet was investigated during vestibular disturbance in seven normal subjects who were exposed to bipolar biaural galvanic stimulation of the vestibular nerves before and after their feet were anaesthetized with hypothermia. The increase in body sway in the lateral plane induced by the galvanic stimulus was enhanced when the feet were anaesthetized, and adaptation of postural control to the galvanic stimulus was delayed. It is concluded that pressor information from the feet contributes significantly to postural control in humans and is important in compensating for vestibular disturbance.
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| 6. |
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| 7. |
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| 8. |
- Pyykkö, I., et al.
(författare)
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Effect of proprioceptor stimulation on postural stability in patients with peripheral or central vestibular lesion
- 1991
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Ingår i: Acta Oto-Laryngologica. - 0001-6489. ; 111:1, s. 27-35
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Tidskriftsartikel (refereegranskat)abstract
- Body sway in upright stance at rest and after inducing proprioceptor stimulation, elicited by vibration applied to the calf or neck muscles, was studied in 11 patients with peripheral lesion and in 17 patients with central vestibular lesion. The responses were compared with those of 20 normal subjects. Vibratory stimulus was applied at five different frequencies, ranging from 32 to 150 Hz, and at a constant amplitude of 2.1 mm. Postural stability was measured with a force platform in terms of average deviation of body position (ADBP) analyzed in relation to the individual maximum support distance in the anterio-posterior direction. In patients with peripheral vestibular lesion ADBP was moderately increased, compared to normal subjects, when the calf muscles were exposed to vibration under eyes closed conditions (i.e. no visual information available); stimulation of neck muscles both under eyes open and eyes closed conditions and stimulation of calf muscles with open eyes produced an ADBP of the same magnitude as in controls. In patients with central vestibular lesion, proprioceptor stimulation of calf and neck muscles caused increased ADBP whether with eyes open or closed. The ADBP induced by stimulation of neck muscles was significantly greater in patients with a central lesion than in those with a peripheral vestibular lesion. The results indicate that patients with peripheral lesion differ from those with central vestibular lesion in their reaction to proprioceptor stimulus; and that in patients with central vestibular lesion proprioceptor stimulation of the neck muscles produces disproportionately powerful cervico-collic reflexes.
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| 9. |
- Schalén, L, et al.
(författare)
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Clinical aspects of eye tracking test
- 1988
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Ingår i: Acta Oto-Laryngologica, Supplement. - : Informa UK Limited. - 0365-5237 .- 0001-6489 .- 1651-2251. ; 105:Suppl 455, s. 28-32
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The eye tracking test is today a well established part of clinical otoneurological examination. In the present paper some applications of the test in evaluating of the level of lesion within the vestibular system are reviewed.
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