Publications by authors named "Mathias R Aebi"
Baroreflex sensitivity (BRS) is a measure of cardiovagal baroreflex and is lower in normobaric and hypobaric hypoxia compared to normobaric normoxia. The aim of this study was to assess the effects of hypobaria on BRS in normoxia and hypoxia. Continuous blood pressure and ventilation were recorded in eighteen seated participants in normobaric normoxia (NNx), hypobaric normoxia (HNx), normobaric hypoxia (NHx) and hypobaric hypoxia (HHx).
View Article and Find Full Text PDFExposure to hypoxia has a deleterious effect on cognitive function; however, the putative effect of hypobaria remains unclear. The present study aimed to evaluate cognitive performance in pilot trainees who were exposed to acute normobaric (NH) and hypobaric hypoxia (HH). Of relevance for military pilots, we also aimed to assess cognitive performance in hypobaric normoxia (HN).
View Article and Find Full Text PDFIntroduction: The present study evaluated the putative effect of hypobaria on resting HRV in normoxia and hypoxia.
Methods: Fifteen young pilot trainees were exposed to five different conditions in a randomized order: normobaric normoxia (NN, P = 726 ± 5 mmHg, FO = 20.9%), hypobaric normoxia (HN, P = 380 ± 6 mmHg, FO≅40%), normobaric hypoxia (NH, P = 725 ± 4 mmHg, FO≅11%); and hypobaric hypoxia (HH at 3000 and 5500 m, HH3000 and HH5500, P = 525 ± 6 and 380 ± 8 mmHg, respectively, FO = 20.
It remains unknown whether hypobaria plays a role on cerebrovascular reactivity to CO (CVR). The present study evaluated the putative effect of hypobaria on CVR and its influence on cerebral oxygen delivery (cDO ) in five randomized conditions (i.e.
View Article and Find Full Text PDFArticle Synopsis
- This clinical report analyzes a spontaneous vasovagal reaction without fainting, tracking physiological changes in three phases: baseline, reaction, and recovery.
- At about 200 seconds, the reaction onset included lower blood pressure, higher heart rate, and changes in tissue oxygenation and brain activity.
- Key findings revealed decreased cerebral oxygenation and blood volume in the brain, indicating hypoperfusion, without loss of consciousness, accompanied by notable EEG changes during the process.
Purpose: The aim of this study was to evaluate the effects of active preconditioning techniques using blood flow restriction or/and systemic hypoxic exposure on repeated sprint cycling performance and oxygenation responses.
Methods: Participants were 17 men; 8 were cycle trained (T: 21 ± 6 h/week) and 9 were untrained but physically active (UT). Each participant completed 4 cycles of 5 min stages of cycling at 1.