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Titolo:
The reproducibility of tolerance to lower-body negative pressure and its quantification
Autore:
Howden, R; Tranfield, PA; Lightfoot, JT; Brown, SJ; Swaine, IL;
Indirizzi:
De Montfort Univ, Bedford MK40 2BZ, England De Montfort Univ Bedford England MK40 2BZ niv, Bedford MK40 2BZ, England Univ N Carolina, Dept Hlth Promot & Kinesiol, Charlotte, NC 28223 USA UnivN Carolina Charlotte NC USA 28223 Kinesiol, Charlotte, NC 28223 USA
Titolo Testata:
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 5, volume: 84, anno: 2001,
pagine: 462 - 468
SICI:
1439-6319(200105)84:5<462:TROTTL>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORTHOSTATIC INTOLERANCE; HUMANS; RESISTANCE; EXPOSURES; DYNAMICS; FITNESS;
Keywords:
LBNP tolerance index; cumulative stress index; blood pressure; heart rate;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Howden, R De Montfort Univ, Landsdowne Rd, Bedford MK40 2BZ, England De Montfort Univ Landsdowne Rd Bedford England MK40 2BZ England
Citazione:
R. Howden et al., "The reproducibility of tolerance to lower-body negative pressure and its quantification", EUR J A PHY, 84(5), 2001, pp. 462-468

Abstract

The reproducibility of tolerance to lower-body negative pressure (LBNP) has not been assessed sufficiently. Furthermore, there has been confusion concerning the most appropriate index by which LBNP tolerance can be quantified. The purpose of this study was to assess the degree of reproducibility inpresyncopal-symptom-limited LBNP (LBNPtol), using an LBNP chamber. Twenty physically active subjects [median age (range) 21 (18-27) years] underwent three successive LBNPtol tests with 72-120 h between each test. LBNPtol wasquantified using the LBNP tolerance index (LTI; Delta mmHg(.)min), cumulative stress index (CSI; mmHg(.)min), duration of negative pressure (DNP) andmaximum magnitude of negative pressure (MNP). Heart rate (f(c)), systolic (SBP) and diastolic (DBP) blood pressures from the three repeated tests were compared during a control period. The changes from control to maximum response (f(c), SBP, DBP) during LBNP were also compared, and percentage changes in estimated blood volume were measured. There were no statistical differences between any of these comparisons (P > 0.05). LTI and CSI were greater in the third test when compared to the first two tests (P < 0.05). The values for DNP and MNP were not statistically different between tests (P > 0.05). Measures of LTI and CSI showed an acceptable level of reproducibility for the first two repeated tests. However, there was an increase in LBNPtolon the third successive exposure to LBNP. These findings have shown that it is possible to achieve reproducible measures of tolerance to LBNP when using a custom-built chamber. This only applies to a test-retest procedure. Furthermore, these data also suggest that DNP and MNP do not adequately reflect the differences shown in LBNP tolerance when using LTI and CSI as measures.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 10:31:36