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Titolo:
Sensory organization for balance: Specific deficits in Alzheimer's but notin Parkinson's disease
Autore:
Chong, RKY; Horak, FB; Frank, J; Kaye, J;
Indirizzi:
Med Coll Georgia, Dept Phys Therapy, Augusta, GA 30912 USA Med Coll Georgia Augusta GA USA 30912 Phys Therapy, Augusta, GA 30912 USA Oregon Hlth Sci Univ, Inst Neurol Sci, Portland, OR 97201 USA Oregon Hlth Sci Univ Portland OR USA 97201 ol Sci, Portland, OR 97201 USA Oregon Hlth Sci Univ, Dept Neurol, Portland, OR 97201 USA Oregon Hlth Sci Univ Portland OR USA 97201 Neurol, Portland, OR 97201 USA Univ Waterloo, Dept Kinesiol, Waterloo, ON N2L 3G1, Canada Univ Waterloo Waterloo ON Canada N2L 3G1 ol, Waterloo, ON N2L 3G1, Canada
Titolo Testata:
JOURNALS OF GERONTOLOGY SERIES A-BIOLOGICAL SCIENCES AND MEDICAL SCIENCES
fascicolo: 3, volume: 54, anno: 1999,
pagine: M122 - M128
SICI:
1079-5006(199903)54:3<M122:SOFBSD>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
SENILE DEMENTIA; ATTENTION; FALLS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Life Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Chong, RKY Med Coll Georgia, Dept Phys Therapy, Augusta, GA 30912 USA Med Coll Georgia Augusta GA USA 30912 y, Augusta, GA 30912 USA
Citazione:
R.K.Y. Chong et al., "Sensory organization for balance: Specific deficits in Alzheimer's but notin Parkinson's disease", J GERONT A, 54(3), 1999, pp. M122-M128

Abstract

Background. The cause of frequent falling in patients with dementia of theAlzheimer type (AD) is not well understood. Distraction from incongruent visual stimuli may be an important factor as suggested by their poor performance in tests of shifting visual attention in other studies. The purpose ofthis study was to determine whether AD patients have difficulty maintaining upright balance under absent and/or incongruent visual and other sensory conditions compared to nondemented healthy elderly persons and individuals with Parkinson's disease (PD). Methods. Seventeen healthy older adults, 15 medicated PD subjects, and ii AD subjects underwent the Sensory Organization Test protocol. The incidenceof loss of balance ("falls"), and the peak-to-peak amplitude of body center of mass sway during stance in the six sensory conditions were used to infer the ability to use visual, somatosensory, and vestibular signals when they provided useful information for balance, and to suppress them when they Here incongruent as an orientation reference. Vestibular reflex tests were conducted to ensure normal vestibular function in the subjects. Results. AD subjects had normal vestibular function but had trouble using it in condition 6, where they had to concurrently suppress both incongruentvisual and somatosensory inputs. All 11 AD subjects fell in the first trial of this condition. With repeated trials, only three AD subjects were ableto stay balanced. AD subjects were able to keep their balance when only somatosensory input was incongruent. In this condition, all AD subjects were able to maintain balance whereas some falls occurred in the other groups. Tn all conditions, when AD subjects did not fall, they were able to control as large a sway as the healthy controls, except when standing with eyes closed in condition 2: AD subjects did not increase their sway whereas the other groups did. In the PD group, the total fall incidence was similar to theAD group, but the distribution was generalized across more sensory conditions. PD subjects were also able to improve with repeated trials in condition 6. Conclusion, Patients with dementia of the Alzheimer type have decreased ability to suppress incongruent visual stimuli when trying to maintain balance. However, they did not seem to be dependent on vision for balance becausethey did not increase their sway when vision was absent. Parkinsonian patients have a more general balance control problem in the sensory organization test, possibly related to difficulty changing set.

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Documento generato il 04/04/20 alle ore 12:24:55