Effects of Voluntary Neck Extension on Cerebral Blood Flow, in Breath-hold Divers Ending an Apnoea of Two Minutes or More. (APNECK)
Healthy Amateur Divers
About this trial
This is an interventional basic science trial for Healthy Amateur Divers focused on measuring apnea, neck extension, syncope, diving blackout, right internal carotid arteria, pulsatility index, healthy trained apnoea divers, doppler ultrasonography
Eligibility Criteria
Inclusion Criteria:
- Major (≥18 years), under the age of 51
- Male
- Can hold an apnea of 2 minutes or more
- Practicing for less than 2 years the apnea at the rate of at least 10 sessions of apnea in the year
- Not having a known cardiovascular history : any form of heart rhythm disorder, Ischemic heart disease, angina, arteriopathy, any valvular pathology, high blood pressure ...
- No known respiratory history (asthma, Chronic Obstructive Pulmonary Disease, bronchiectasis, pulmonary emphysema, pneumothorax, pleurisy, pulmonary infection, lobectomy ...)
- No neurological history of type: epilepsy, deficit syndrome, iterative loss of knowledge, recent head trauma with loss of consciousness
Exclusion Criteria:
- - Minors and persons over 51 years of age
- Person under curators or trusteeship
- Person with a history of cardiovascular, respiratory or epilepsy as cited by the French Federation of Study and Submarine Sports, which poses as a contra-indication to the practice of apnea: Cardiac insufficiency, Obstructive Cardiomyopathy, syncopal risk pathology (valvulopathies type aorting narrowing or mitral narrowing), paroxysmal tachycardia, non-paired auriculo ventricular block 2/3, stroke, uncontrolled hypertension after stress test, recent infarction, angina, pericarditis. Asthma stage 3, severe Chronic Obstructive Pulmonary Disease, bronchiectasis, pulmonary emphysema, pneumothorax, pleurisy, pulmonary infection, lobectomy ...) Epilepsy, deficit syndrome, iterative loss of knowledge, recent head trauma with loss of consciousness in difficulty, symptomatic cervical or lumbar disc herniation
- Patient with medical treatment affecting the cardiovascular or respiratory system (for example: ventolin, betablocker ...)
Sites / Locations
- Nantes hospital
Arms of the Study
Arm 1
Experimental
apnea performing
The included subjects will make an apnea of two minutes or more, sitting on a chair with cold strips on the face, initially with the head in neutral position. Then, when they feel the end of their apnea, they will have to raise their left hand to signal it to the Doppler manipulator, who will then realize the apnea reference measurement. As soon as this is done, the subjects will be asked to perform an extension of the neck, so as to look at the ceiling. A final measurement will then be made in apnea, the head always in extension. Subjects then resume their breathing in this same position. A final measurement will then be made.