title: Effects on sleep patterns during simulated oxygen-helium saturation diving at 180 and 230 m.
abstract: The standard polysomnography of four divers was recorded respectively through 188 nights in two simulated experiments under a hyperbaric saturation environment of He-O2 mixture at the depths of 180 and 230 m. In the two diving conditions on the bottom nights and decompression nights, the following was shown: A reduction of total sleep time, a decrease of sleep efficiency; an increase of sleep latency, frequency of wake after sleep, number of sleep stage shifts, and a lengthening of stage 1 sleep; and a reduction of stage 4 sleep. In the 230 m-diving condition on the bottom nights and the decompression nights, only stage 4 sleep showed a significant decrease when compared with the 180 m-diving condition. It is assumed that both were conditions in which awakening was likely to happen and there would be no disorders of fundamental sleep patterns.
authors.affiliation: Graduate School, University of East Asia, Yamaguchi, Japan.
authors.forename: Y J
authors.initials: YJ
authors.lastname: Seo
authors.forename: K
authors.initials: K
authors.lastname: Matsumoto
authors.forename: M
authors.initials: M
authors.lastname: Mohri
authors.forename: Y M
authors.initials: YM
authors.lastname: Park
authors.forename: S
authors.initials: S
authors.lastname: Matsuoka
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001273:Atmosphere Exposure Chambers; D001274:Atmospheric Pressure; D004242:Diving / Q000009:adverse effects / Q000502:physiology*; D006371:Helium; D006801:Humans; D008297:Male; D010100:Oxygen; D017286:Polysomnography; D012894:Sleep Stages; D012893:Sleep Wake Disorders / Q000209:etiology / Q000503:physiopathology*
chemical_list: D006371:Helium; D010100:Oxygen