Hyperbaric hyperoxia induces a neuromuscular hyperexcitability: assessment of a reduced response in elite oxygen divers

Autor:	Jean Louis Meliet, Claude Robinet, Alain Montmayeur, Marion Faucher, Yves Jammes, Sandrine Arbogast, Ferdinand Tagliarini
Rok vydání:	2003
Předmět:	Hyperoxia Physiology business.industry Vastus lateralis muscle Neuromuscular transmission chemistry.chemical_element General Medicine Hyperbaric hyperoxia Muscle mass Oxygen chemistry Physiology (medical) Anesthesia Breathing Medicine medicine.symptom business human activities Oxygen pressure
Zdroj:	Clinical Physiology and Functional Imaging. 23:149-154
ISSN:	1475-0961
DOI:	10.1046/j.1475-097x.2003.00486.x
Popis:	We compared the changes in compound muscle mass action potential (M-wave) recorded in vastus lateralis in response to hyperbaric hyperoxia (HBO). in nine combat divers who dived daily while breathing 100% O 2 or O 2 -enriched mixture (O 2 divers) to those measured in eight recreational divers who dived occasionally using compressed air/21% O 2 (air divers). The O 2 divers completed a 6-h HBO exposure in which the inspired oxygen pressure (PiO 2 ) varied from 1.15 to 2.7 absolute atmospheres (ATA), PiO 2 being maintained at 1.15 ATA throughout the first 2-h period, whereas the air divers only completed a 2-h HBO exposure with PiO 2 constant at 1.15 ATA. Before HBO exposure, there were no intergroup differences between baseline M-wave characteristics (amplitude and duration), but the conduction time was significantly shorter in O 2 divers compared with air divers. After 90 min of HBO (1.15 ATA) the air divers demonstrated neuromuscular hyperexcitability, as evidenced by an increased M-wave amplitude (13%, P
Databáze:	OpenAIRE
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