Abdominal gas volume at altitude and at ground level.
D000005:Abdomen; D000293:Adolescent; D000328:Adult; D000337:Aerospace Medicine; D000531:Altitude; D001824:Body Constitution; D001835:Body Weight; D005414:Flatulence; D006801:Humans; D007441:Intubation, Gastrointestinal; D008297:Male; D008433:Mathematics; D008722:Methods; D010146:Pain