Squatting test: a dynamic postural manoeuvre to study baroreflex sensitivity.

in Clinical autonomic research : official journal of the Clinical Autonomic Research Society (2011)

INTRODUCTION: Squatting is an active posture test that can be used to assess baroreflex sensitivity. Indeed, the shift from squatting to standing imposes a major orthostatic stress leading to rapid and ... [more ▼]

INTRODUCTION: Squatting is an active posture test that can be used to assess baroreflex sensitivity. Indeed, the shift from squatting to standing imposes a major orthostatic stress leading to rapid and large changes in arterial blood pressure (BP) and heart rate (HR) allowing precise baroreflex assessment. MATERIAL AND METHODS: BP and HR can be continuously and non-invasively monitored with a Finapres device. RESULTS: The standing to squatting transition is accompanied by rises in BP, pulse pressure and cardiac output, mainly due to increased venous return, and by a secondary reduction in HR. Conversely, the squatting to standing transition is associated with an immediate drop in BP and both reflex tachycardia and vasoconstriction. This mirror changes in BP and HR, mimicking those observed with the classical pharmacological approach using vasopressor/vasodilating agents, allows the calculation of the so-called baroreflex gain. DISCUSSION: The present review describes the haemodynamic changes occurring in normal subjects during the shifts from standing to squatting and from squatting to standing and discusses the underlying cardiovascular and autonomic mechanisms. CONCLUSION: This careful analysis in healthy individuals should help in the understanding of disturbances that may be observed in patients with autonomic dysfunction, such as in diabetic patients with cardiovascular autonomic neuropathy. [less ▲]

Squatting to standing: an unusual but powerful postural manoeuvre to investigate human arterial blood pressure regulation

in Archives of Physiology & Biochemistry (1992), 100(5), 31-51

Sr, Nd isotopes and geochemistry of the Bayuda Desert high-grade metamorphic basement (Sudan): An early Pan-African oceanic convergent margin, not the edge of the East Saharan ghost craton?

in Precambrian Research (2001), 109(1-2), 1-23

The high-grade metamorphic basement of the Bayuda Desert is situated at the inferred transition between the juvenile Neoproterozoic mainly greenschist facies Arabian-Nubian Shield (ANS) and the pre ... [more ▼]

The high-grade metamorphic basement of the Bayuda Desert is situated at the inferred transition between the juvenile Neoproterozoic mainly greenschist facies Arabian-Nubian Shield (ANS) and the pre-Neoproterozoic mainly amphibolite facies domain of the East Saharan Ghost Craton. New geochemical and Sr-Nd isotope data reveal that this basement in Bayuda constituted a Neoproterozoic oceanic convergent margin succession with limited and probably late input of old material. Within this series, garnet amphibolites and epidote-biotite gneisses have geochemical characteristics of HFSE-depleted tholeiitic basalts and low- to medium-K dacites and rhyodacites, indicating magmatism in an oceanic island arc or back-arc basin environment. This magmatism occurred at 806 ± 19 Ma (Sm-Nd 11 WR isochron), similar in age to arc magmatism in the ANS. Leucocratic gneisses, muscovite schists and garnet-biotite schists form the dominant meta-sedimentary rocks of the study area. They were primarily derived from two different sources: volcanogenic sediments from a Neoproterozoic island arc (TDM Nd model ages between 790 and 900 Ma) and terrigeneous sediments from an older continental source (TDM Nd model ages up to 2100 Ma). The volcanosedimentary succession was metamorphosed under amphibolite facies conditions prior to 670 Ma, probably at approximately 700 Ma. The high-grade metamorphism is related to a frontal collisional event that also produced syn-collisional peraluminous granites preserved as muscovite-biotite gneisses. Meta-igneous rocks from eastern Bayuda have εNd values at 806 Ma of + 5.2 ± 0.4, indicating a less depleted mantle source (crustal contamination can be excluded) than the neighbouring Gabgaba-Gebeit terrane (εNd, ca. + 7) from the Arabian-Nubian shield. Less depleted mantle source is also known at Jebel Moya to the south, and inside the Arabian-Nubian Shield to the southeast of Bayuda. Lithological and structural similarities (dominantly northeast striking foliation) with the Bayuda Desert succession occur in many parts of central and western Sudan, suggesting a comparable geodynamic evolution. It is proposed that a Neoproterozoic oceanic convergent margin (Bayuda type succession) collided at approximately 700 Ma to the northwest with the East Saharan ghost craton, whose easternmost limit must lie below or more to the west than previously thought. © 2000 Elsevier Science B.V. [less ▲]

SS433, un étrange objet galactique

Article for general public (1988)

Not Available

St Lambert and the Mosan Saints

in Treasures from Liege - Trésors de Liège, p. 65-82 (1985)

The St-Michel reconstruction-project in Liège : A morphological regulation case study

in Proc. of COST Urban Civil Engineering - Action C4 Final Conference (1998)

Staalname van de hersenstam voor TSE-Onderzoek bij het schaap

in Vlaams Diergeneeskundig Tijdschrift (2002), 71

Stabilisation des sols à la chaux. Action de la chaux vive sur la bentonite et sur la kaolinite.

in Bulletin des Recherches Agronomiques de Gembloux (1984), 19(1-2), 81-110

La stabilisation fonctionnelle lombaire : Défintion du concept et arguments scientifiques

in Abstract book des Mardis de la Kinésithérapie (2008)

Stabilisation vibratoire de la ligne de galvanisation Eurogal - Etude paramétrique

Report (2001)