title: Comparison of speech materials recorded in room air at ground level and in a helium-oxygen mixture at a simulated altitude of 18,000 feet.
mesh_terms: D000337:Aerospace Medicine; D000388:Air; D000531:Altitude; D001274:Atmospheric Pressure; D001299:Audiometry; D004192:Discrimination, Psychological; D018504:Ecological Systems, Closed; D006371:Helium; D006801:Humans; D008297:Male; D009622:Noise; D010100:Oxygen; D012677:Sensation; D013026:Space Flight; D013060:Speech; D014831:Voice
chemical_list: D006371:Helium; D010100:Oxygen