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Physiology of deep closed circuit rebreather mixed gas diving: vascular gas emboli and biological changes during a week-long liveaboard safari
01 mars 2024, BALESTRA, Costantino; Leveque Clément; Mrakic-Sposta Simona; Wauthy Pierre; GERMONPRÉ, Peter; Tillmans Frauke; Guerrero François; Lafere Pierre; Vezzoli Alessandra,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
Introduction: Diving decompression theory hypothesizes inflammatory
processes as a source of micronuclei which could increase related risks.
Therefore, we tested 10 healthy, male divers. They performed 6–8 dives with
a maximum of two dives per day at depths ranging from 21 to 122 msw with CCR
mixed gas diving.
Methods: Post-dive VGE were counted by echocardiography. Saliva and urine
samples ...
Varying Oxygen Partial Pressure Elicits Blood-Borne Microparticles Expressing Different Cell-Specific Proteins-Toward a Targeted Use of Oxygen?
17 juillet 2022, BALESTRA, Costantino; Arya, Awadhesh; Leveque, Clément; Virgili, Fabio; GERMONPRÉ, Peter; LAMBRECHTS, Kate; Lafere, Pierre; Thom, Stephen,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
Oxygen is a powerful trigger for cellular reactions, but there are few comparative investigations assessing the effects over a large range of partial pressures. We investigated a metabolic response to single exposures to either normobaric (10%, 15%, 30%, 100%) or hyperbaric (1.4 ATA, 2.5 ATA) oxygen. Forty-eight healthy subjects (32 males/16 females; age: 43.7 +/- 13.4 years, height: 172.7 +/- 10.07 ...
Mini Trampoline, a New and Promising Way of SCUBA Diving Preconditioning to Reduce Vascular Gas Emboli?
29 avril 2022, LAMBRECHTS, Kate; GERMONPRÉ, Peter; Vandenheede, Joaquim; Delorme, Manon; Lafere, Pierre; BALESTRA, Costantino,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
Background: Despite evolution in decompression algorithms, decompression illness is still an issue nowadays. Reducing vascular gas emboli (VGE) production or preserving endothelial function by other means such as diving preconditioning is of great interest. Several methods have been tried, either mechanical, cardiovascular, desaturation aimed or biochemical, with encouraging results. In this study, ...
Physiology of repeated mixed gas 100-m wreck dives using a closed-circuit rebreather: a field bubble study
28 novembre 2021, BALESTRA, Costantino; Guerrero, François; THEUNISSEN, Sigrid; GERMONPRÉ, Peter; Lafère, Pierre,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
Purpose: Data regarding decompression stress after deep closed-circuit rebreather (CCR) dives are scarce. This study aimed to monitor technical divers during a wreck diving expedition and provide an insight in venous gas emboli (VGE) dynamics.
Methods: Diving practices of ten technical divers were observed. They performed a series of three consecutive daily dives around 100 m. VGE counts were ...
Comparison of insulation provided by dry or wetsuits among recreational divers during cold water immersion (< 5 degrees C)
05 octobre 2021, Lafère, Pierre; Guerrero, François; GERMONPRÉ, Peter; BALESTRA, Costantino,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
BACKGROUND: Divers thermal status influences susceptibility to decompression sickness hence the need for proper insulation during immersion in cold water. However, there is a lack of data on thermal protection provided by diving suits, hence this study. MATERIALS AND METHODS: Two different groups of divers wearing either a wetsuit (n = 15) or a dry suit (n = 15) volunteered for this study. Anthropometric ...
Comparison of insulation provided by dry or wetsuits among recreational divers during cold water immersion (< 5 degrees C)
05 octobre 2021, Lafère, Pierre; Guerrero, François; GERMONPRÉ, Peter; BALESTRA, Costantino,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
BACKGROUND: Divers thermal status influences susceptibility to decompression sickness hence the need for proper insulation during immersion in cold water. However, there is a lack of data on thermal protection provided by diving suits, hence this study. MATERIALS AND METHODS: Two different groups of divers wearing either a wetsuit (n = 15) or a dry suit (n = 15) volunteered for this study. Anthropometric ...
Heart Rate Variability During a Standard Dive: A Role for Inspired Oxygen Pressure?
13 août 2021, Lafère, Pierre; LAMBRECHTS, Kate; GERMONPRÉ, Peter; BALESTRA, Ambre; Germonpré, Faye-Lisa; Marroni, Alessandro; Cialoni, Danilo; Bosco, Gerardo; BALESTRA, Costantino,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
Introduction: Heart rate variability (HRV) during underwater diving has been infrequently investigated because of environment limitations and technical challenges. This study aims to analyze HRV changes while diving at variable hyperoxia when using open circuit (OC) air diving apparatus or at constant hyperoxia using a closed-circuit rebreather (CCR). We used HRV analysis in time and frequency domain ...
Heart Rate Variability During a Standard Dive: A Role for Inspired Oxygen Pressure?
13 août 2021, Lafère, Pierre; LAMBRECHTS, Kate; GERMONPRÉ, Peter; BALESTRA, Ambre; Germonpré, Faye-Lisa; Marroni, Alessandro; Cialoni, Danilo; Bosco, Gerardo; BALESTRA, Costantino,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
Introduction: Heart rate variability (HRV) during underwater diving has been infrequently investigated because of environment limitations and technical challenges. This study aims to analyze HRV changes while diving at variable hyperoxia when using open circuit (OC) air diving apparatus or at constant hyperoxia using a closed-circuit rebreather (CCR). We used HRV analysis in time and frequency domain ...
Feasibility of Detecting Brain Areas Involved in Extreme Breath-Hold Diving
20 janvier 2021, Jissendi-Tchofo, Patrice; Jdaoudi, Yassin; GERMONPRÉ, Peter; Brizzolari, Andrea; Musimu, Patrick; BALESTRA, Costantino,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
We report Blood Oxygen Level Dependent (BOLD) signal changes recorded in the brain of an elite breath-hold diver during voluntary dry long breath-hold by means of fMRI. An independent component analysis (ICA) method was applied to extract brain areas that are putatively involved in the apnea process network. We discuss the hypothesis that these BOLD signal variations express the functional adaptive ...
Evaluation of Protection Level, Respiratory Safety, and Practical Aspects of Commercially Available Snorkel Masks as Personal Protection Devices Against Aerosolized Contaminants and SARS-CoV2
15 juin 2020, GERMONPRÉ, Peter; Van Rompaeye, Dirk; BALESTRA, Costantino,
- HE Bruxelles Brabant
,
- Article scientifique
Article scientifique
Introduction: The “Severe Acute Respiratory Syndrome Coronavirus 2” (SARS-CoV2) pandemic has led to a worldwide shortage of personal protection devices (PPD) for medical and paramedical personnel. Adaptation of commercially available snorkel masks to serve as full face masks has been proposed. Even not formally approved as PPD, they are publicized on social media as suitable for this use. Concerns ...