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Ultrasound lung "comets" increase after breath-hold diving
23 octobre 2010, LAMBRECHTS, Kate; GERMONPRÉ, Peter; Charbel, Brian; Cialoni, Danilo; Musimu, Patrick; Sponsiello, Nicola; Marroni, Alessandro; Pastouret, Fredéric; BALESTRA, Costantino,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
The purpose of the study was to analyze the ultrasound lung comets (ULCs) variation, which are a sign of extra-vascular lung water. Forty-two healthy individuals performed breath-hold diving in different conditions: dynamic surface apnea; deep variable-weight apnea and shallow, face immersed without effort (static maximal and non-maximal). The number of ULCs was evaluated by means of an ultrasound ...
The 'normobaric oxygen paradox': does it increase haemoglobin?
14 juin 2012, De Bels, David; THEUNISSEN, Sigrid; Devriendt, Jacques; GERMONPRÉ, Peter; Lafère, Pierre; Valsamis, Joseph; SNOECK, Thyl; Meeus, Philippe; BALESTRA, Costantino,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
Background: A novel approach to increasing erythropoietin (EPO) using oxygen (O2) (the 'normobaric oxygen paradox') has been reported in healthy volunteers. We investigated whether the EPO increase is sufficient to induce erythropoiesis by comparing two protocols of O2 administration.
Methods: We compared the effect of daily versus alternate days 100% O2, breathed for 30 minutes, on haemoglobin ...
Nitric oxide-related endothelial changes in breath-hold and scuba divers
01 mars 2013, THEUNISSEN, Sigrid; Guerrero, François; Sponciello, Nicholas; Cialoni, Danilo; Pieri, Massimo; GERMONPRÉ, Peter; Obeid, Georges; Tillmans, Frauke; Papadopoulou, Virginie; HEMELRYCK, Walter; Marroni, Alessandro; De Bels, David; BALESTRA, Costantino,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
Objective: Scuba and breath-hold divers are compared to investigate whether endothelial response changes are similar despite different exposure(s) to hyperoxia.
Design: 14 divers (nine scuba and five breath-holding) performed either one scuba dive (25m/25 minutes) or successive breath-hold dives at a depth of 20 meters, adding up to 25 minutes of immersion time in a diving pool. Flow-mediated ...
The effect of a passive stretch training protocol on performance during a drop jump in humans
30 mars 2013, Levenez, Morgan; THEUNISSEN, Sigrid; Bottero, Antoine; SNOECK, Thyl; Tinlot, Arnaud; BALESTRA, Costantino; Provyn, Steven,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
Our study's aim is to show how a five-week stretch training protocol, based on passive stretching, can change muscle performance during a drop jump (stretch shortening cycle). METHODS: This study observes in 8 healthy subjects (four males and four females), the effect of a 5-week passive stretch training protocol on the stretch shortening cycle (SSC) during the performance of a drop jump, and identify ...
Effect of tetrahydrobiopterin and exercise training on endothelium-dependent vasorelaxation in SHR
02 juin 2013, Guerrero, François; Sanéo, Thioub; Goanvec, Christelle; THEUNISSEN, Sigrid; Feray, Annie; BALESTRA, Costantino; Mansourati, Jacques,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
We examined whether the improvement of impaired NO-dependent vasorelaxation by exercise training could be mediated through a BH4-dependent mechanism. Male spontaneously hypertensive rats (SHR, n = 20) and Wistar-Kyoto rats (WKY, n = 20) were trained (Tr) for 9 weeks on a treadmill and compared to age-matched sedentary animals (Sed). Endothelium-dependent vasorelaxation (EDV) was assessed with ...
Oxidative stress in breath-hold divers after repetitive dives
08 juin 2013, THEUNISSEN, Sigrid; Sponciello, Nicholas; Rozloznik, Miroslav; GERMONPRÉ, Peter; Guerrero, François; Cialoni, Danilo; BALESTRA, Costantino,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
Introduction: Hyperoxia causes oxidative stress. Breath-hold diving is associated with transient hyperoxia followed by hypoxia and a build-up of carbon dioxide (CO₂), chest-wall compression and significant haemodynamic changes. This study analyses variations in plasma oxidative stress markers after a series of repetitive breath-hold dives.
Methods: Thirteen breath-hold divers were asked to perform ...
The effect of a passive stretch training protocol on performance during a drop jump in humans
15 juin 2013, Lévénez, Morgan; THEUNISSEN, Sigrid; Bottero, Antoine; SNOECK, Thyl; Bruyère, A; Tinlot, Arnaud; BALESTRA, Costantino; Provyn, Steven,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
Aim: Our study's aim is to show how a five-week stretch training protocol, based on passive stretching, can change muscle performance during a drop jump (stretch shortening cycle).
Methods: This study observes in 8 healthy subjects (four males and four females), the effect of a 5-week passive stretch training protocol on the stretch shortening cycle (SSC) during the performance of a drop jump, ...
Effect of a single, open-sea, air scuba dive on human micro- and macrovascular function
15 août 2013, LAMBRECHTS, Kate; Pontier, Jean-Michel; BALESTRA, Costantino; Mazur, Aleksandra; Wang, Qiong; Buzzacott, Peter; Theron, Michaël; Mansourati, Jacques; Guerrero, François,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
Purpose: Previous studies have shown that bubble formation induced endothelial damage on conduit arteries. We aim to evaluate the effect of diving on microvascular and macrovascular function.
Methods: Nine divers took part in a SCUBA dive at 30 msw (400 kPa), for 30 min of bottom time. Pre- and post-dive, they underwent an assessment of endothelial-dependent (acetylcholine) and endothelial-independent ...
Dark chocolate reduces endothelial dysfunction after successive breath-hold dives in cool water
16 septembre 2013, THEUNISSEN, Sigrid; Schumacker, Julie; Guerrero, François; Tillmans, Frauke; BOUTROS, Antoine; Lambrechts, Kate; Mazur, Alexandra; Pieri, Massimo; GERMONPRÉ, Peter; BALESTRA, Costantino,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
Objective: The aim of this study is to observe the effects of dark chocolate on endothelial function after a series of successive apnea dives in non-thermoneutral water.
Methods: Twenty breath-hold divers were divided into two groups: a control group (8 males and 2 females) and a chocolate group (9 males and 1 female). The control group was asked to perform a series of dives to 20 m adding up to ...
The "normobaric oxygen paradox": a new tool for the anesthetist?
10 janvier 2014, Rocco, Monica; Ditri, Luciano; De Bels, David; Corazza, Francis; BALESTRA, Costantino,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
Hypoxia is the natural trigger for endogenous EPO production but recently the use of intermittent hyperoxia to stimulate EPO has been postulated and this phenomenon has been called the "normobaric oxygen paradox" (NOP). The "NOP" is a mechanism by which oxygen regulates the expression of the Hypoxia Inducible Factor 1 alpha (HIF-1alpha). The HIF-1alpha-depending gene regulation is responsible for ...