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Titolo:
Orthostatic hypotension in elderly persons during passive standing: A comparison with young persons
Autore:
Kawaguchi, T; Uyama, O; Konishi, M; Nishiyama, T; Iida, T;
Indirizzi:
Coll Nursing Art & Sci Hyogo, Akashi, Hyogo 6738588, Japan Coll Nursing Art & Sci Hyogo Akashi Hyogo Japan 6738588 go 6738588, Japan Ritsumeikan Univ, Coll Sci & Engn, Kusatsu, Japan Ritsumeikan Univ Kusatsu Japan an Univ, Coll Sci & Engn, Kusatsu, Japan
Titolo Testata:
JOURNALS OF GERONTOLOGY SERIES A-BIOLOGICAL SCIENCES AND MEDICAL SCIENCES
fascicolo: 5, volume: 56, anno: 2001,
pagine: M273 - M280
SICI:
1079-5006(200105)56:5<M273:OHIEPD>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEART-RATE-VARIABILITY; NEAR-INFRARED SPECTROSCOPY; BLOOD-PRESSURE; CEREBRAL OXYGENATION; TILT; HEMOGLOBIN; ARTERIES; ISCHEMIA; FLOW;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Life Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Kawaguchi, T Coll Nursing Art & Sci Hyogo, 13-71 Kitaoji Cho, Akashi, Hyogo 6738588, Japan Coll Nursing Art & Sci Hyogo 13-71 Kitaoji Cho Akashi Hyogo Japan 6738588
Citazione:
T. Kawaguchi et al., "Orthostatic hypotension in elderly persons during passive standing: A comparison with young persons", J GERONT A, 56(5), 2001, pp. M273-M280

Abstract

Background. The present study was aimed at clarifying the mechanism of orthostatic hypotension (OH) that occurs in elderly persons and at investigating assisting methods to prevent OH by evaluating changes in autonomic nervous system (ANS) activity and cerebral circulation of elderly persons when engaged in passive standing. Methods. Eight elderly volunteers and 9 young volunteers gave informed consent to participate in the study. Two experimental conditions were established: (i) "active standing," in which the subjects stood on their own with guidance from an assistant, and (ii) "passive standing," in which the subjects were placed in a standing position completely by an assistant. ANS was determined before and after standing by measuring the heart rate variability. The reaction of the ANS was evaluated on the basis of low-frequency power(LF: 0.05-0. 15 Hz) and high-frequency power (HF: 0.15-0.4 Hz), which wereseparated from the R-R interval data by power spectral analysis using the fast Fourier transformation. Cerebral perfusion was measured over the rightfrontal region using a near-infrared spectroscopy cerebral oxygen monitor. Results. The main findings were: (i) Transient decreases in blood pressureoccurred immediately after standing in both the young and elderly subjects. (ii) The LF:HF ratio increased significantly (p < .05) immediately after active standing in the young subjects, whereas this ratio increased in the elderly subjects after some delay. (iii) The LF:HF ratio increased significantly (p < .01) immediately after passive standing in the young subjects, whereas this ratio decreased significantly (p < .05) in the elderly subjects. (iv) In the elderly subjects, the total hemoglobin (HbT) and oxyhemoglobin showed the greatest decrease during the 15-second period after standing. The maximum changes in the WT with passive standing differed significantly(p < .01) from those observed during active standing. Conclusions. Our findings emphasize the need to devise bioengineered meansthat allow elderly persons to exert themselves, to maintain or improve muscle contractility and ANS function, while providing minimum assistance for standing.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 11:49:43