The determinations carried out on 12 divers during the immersion into the sea to a depth between 7 and 29 m, as well as on controls in immersions at 4 m revealed a significant prolongation of the visual reaction time and a marked tachycardia. The changes were more marked at great depths and if exercise was superimposed over hyperbaric stress. A rise in the urinary excretion of 17-HOCS and vanillylmandelic acid and an impairment of the manual dexterity were also found during immersions. The results stress the importance of divers' monitoring during their underwater activity and the necessity of improving their physical training.
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Psychophysiologic changes in sleep during simulated 200-m heliox saturation dives.
Undersea Biomed Res
January 1992
Undersea Medical Center, Japan Maritime Self-Defense Force, Kanagawa.
The standard polysomnogram and questionnaire were measured from 4 subjects during 2 simulated 200-m heliox saturation dives. These measurements were performed for 1 precompression night, bottom nights, 4 or 5 nights during decompression, and 1 postdecompression night. Although the subjects reported a marked decrease in quantity and quality of sleep at the bottom, only a slight degree of sleep disturbance caused by frequent awakenings was found in polysomnograms.
View Article and Find Full Text PDFThe major objective of this study was to demonstrate the advantages of transforming raw scores to ipsative form (deviation scores calculated around each subject's mean), particularly in diver research characteristically involving small subject samples in a self-control design. Measures of reaction time, response accuracy, anxiety, hostility, and depression were obtained from three U.S.
View Article and Find Full Text PDFThe determinations carried out on 12 divers during the immersion into the sea to a depth between 7 and 29 m, as well as on controls in immersions at 4 m revealed a significant prolongation of the visual reaction time and a marked tachycardia. The changes were more marked at great depths and if exercise was superimposed over hyperbaric stress. A rise in the urinary excretion of 17-HOCS and vanillylmandelic acid and an impairment of the manual dexterity were also found during immersions.
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