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Human Vestibular Response During 3 Gz Centrifuge Stimulation
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Book Synopsis Human Vestibular Response During 3 Gz Centrifuge Stimulation by : R. J. McGrath
Download or read book Human Vestibular Response During 3 Gz Centrifuge Stimulation written by R. J. McGrath and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of centrifuges in training aircrew to avoid GLOC is increasing. The purpose of this study was to record the vestibulo-ocular reflex (VOR) and subjective sensations to gain insight into reports of asymmetrical disorientation and disturbance during acceleration and deceleration of GLOC training centrifuges. Horizontal and vertical eye movements and post run sensations were recorded from 15 naive male human subjects seated head erect in a 20.5-ft radius pendulous chair centrifuge. Centrifuge profile was acceleration from 1 to 3 Gz in 19 s, 5 min of sustained 3 Gz, and deceleration to 1 Gz in 19 s. Tests were repeated up to three times with the subject facing the motion, and three times with the subject's back to the motion. Eye position was recorded in the dark using an ISCAN infrared video system. Six subjects experienced GLOC, and 1 withdrew due to unrelated sickness. Slow phase velocity (SPV) and sensations from the 8 subjects who completed all 6 runs were analyzed. Roll of the chair during acceleration and deceleration produced strong pitch, roll, and yaw sensations and eye movements attributable to vestibular Coriolis stimulation. Subjective pitch amplitude change was consistently greater during deceleration than acceleration, regardless of rotation direction. The SPV magnitude during the first run in a given direction was significantly different than the two subsequent runs. A sustained upbeating ('Lz') nystagmus (1-21 deg/ s, mean 8 deg/s at 100 s; 1-12 deg/s at 315 s) was observed in 7 of 8 subjects. VOR during centrifugation is composed of interacting transient angular and sustained linear VOR components. Sensation asymmetries are not observed in the VOR. Lz nystagmus magnitude is an individual subject characteristic. Centrifuge, Vestibulo-ocular, Lz nystagmus, Spatial Orientation.
Book Synopsis Human Vestibular Response During 3 Gz Centrifuge Stimulation by : R. J. McGrath
Download or read book Human Vestibular Response During 3 Gz Centrifuge Stimulation written by R. J. McGrath and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of centrifuges in training aircrew to avoid GLOC is increasing. The purpose of this study was to record the vestibulo-ocular reflex (VOR) and subjective sensations to gain insight into reports of asymmetrical disorientation and disturbance during acceleration and deceleration of GLOC training centrifuges. Horizontal and vertical eye movements and post run sensations were recorded from 15 naive male human subjects seated head erect in a 20.5-ft radius pendulous chair centrifuge. Centrifuge profile was acceleration from 1 to 3 Gz in 19 s, 5 min of sustained 3 Gz, and deceleration to 1 Gz in 19 s. Tests were repeated up to three times with the subject facing the motion, and three times with the subject's back to the motion. Eye position was recorded in the dark using an ISCAN infrared video system. Six subjects experienced GLOC, and 1 withdrew due to unrelated sickness. Slow phase velocity (SPV) and sensations from the 8 subjects who completed all 6 runs were analyzed. Roll of the chair during acceleration and deceleration produced strong pitch, roll, and yaw sensations and eye movements attributable to vestibular Coriolis stimulation. Subjective pitch amplitude change was consistently greater during deceleration than acceleration, regardless of rotation direction. The SPV magnitude during the first run in a given direction was significantly different than the two subsequent runs. A sustained upbeating ('Lz') nystagmus (1-21 deg/ s, mean 8 deg/s at 100 s; 1-12 deg/s at 315 s) was observed in 7 of 8 subjects. VOR during centrifugation is composed of interacting transient angular and sustained linear VOR components. Sensation asymmetries are not observed in the VOR. Lz nystagmus magnitude is an individual subject characteristic. Centrifuge, Vestibulo-ocular, Lz nystagmus, Spatial Orientation.
Book Synopsis Human Vestibular Response During 3 Gz̳ Centrifuge Stimulation by : Braden John McGrath
Download or read book Human Vestibular Response During 3 Gz̳ Centrifuge Stimulation written by Braden John McGrath and published by . This book was released on 1990 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The use of centrifuges in training aircrew to avoid GLOC is increasing. The purpose of this study was to record the vestibulo-ocular reflex (VOR) and subjective sensations to gain insight into reports of asymmetrical disorientation and disturbance during acceleration and deceleration of GLOC training centrifuges. Horizontal and vertical eye movements and post run sensations were recorded from 15 naive male human subjects seated head erect in a 20.5-ft radius pendulous chair centrifuge. Centrifuge profile was acceleration from 1 to 3 Gz in 19 s, 5 min of sustained 3 Gz, and deceleration to 1 Gz in 19 s. Tests were repeated up to three times with the subject facing the motion, and three times with the subject's back to the motion. Eye position was recorded in the dark using an ISCAN infrared video system. Six subjects experienced GLOC, and 1 withdrew due to unrelated sickness. Slow phase velocity (SPV) and sensations from the 8 subjects who completed all 6 runs were analyzed. Roll of the chair during acceleration and deceleration produced strong pitch, roll, and yaw sensations and eye movements attributable to vestibular Coriolis stimulation. Subjective pitch amplitude change was consistently greater during deceleration than acceleration, regardless of rotation direction. The SPV magnitude during the first run in a given direction was significantly different than the two subsequent runs. A sustained upbeating ('Lz') nystagmus (1-21 deg/ s, mean 8 deg/s at 100 s; 1-12 deg/s at 315 s) was observed in 7 of 8 subjects. VOR during centrifugation is composed of interacting transient angular and sustained linear VOR components. Sensation asymmetries are not observed in the VOR. Lz nystagmus magnitude is an individual subject characteristic. Centrifuge, Vestibulo-ocular, Lz nystagmus, Spatial Orientation ."--Stinet.
Book Synopsis Human Vestibulo-Ocular Response During 3-Gz Centrifuge Stimulation by :
Download or read book Human Vestibulo-Ocular Response During 3-Gz Centrifuge Stimulation written by and published by . This book was released on 1996 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vestibulo-ocular reflex (VOR) and spatial orientation perceptions were recorded in 15 subjects during a 3-Gz centrifuge run. These data were obtained to study two issues; first, to gain insight into reports of asymmetrical disorientation and disturbance during acceleration and deceleration of G-induced loss of consciousness (G-LOC) training centrifuges. Secondly, to study the effects of sustained vertical linear acceleration on the vestibular system. The centrifuge run consisted of an acceleration to 3-Gz in 19 s, sustained 3-Gz for 5 min, and a deceleration to 1 Gz in 19 s. The runs were repeated three times with the subject facing the motion, and three times with the subject's back to the motion. The VOR and spatial orientation perceptions from the eight subjects who completed all six runs were analyzed. The total VOR response during acceleration and deceleration of a centrifuge run is composed of interacting angular and linear VOR components. However, the VOR response did not correspond to reported asymmetries in pitch orientation perception between centrifuge acceleration and deceleration. During the constant velocity high G phase of a centrifuge run, a sustained up-beating ("Lz") nystagmus was observed in 14 of the 15 subjects. For the eight subjects analyzed, Lz nystagmus was shown to be an individual subject characteristic, and displayed a range of mean magnitudes from 0 to 10 deg/s at 90 s. Assuming a normal visual suppression ratio of the VOR, the magnitudes of the Lz nystagmus in our subject sample did not appear sufficient to degrade visual acuity.
Book Synopsis Spatial Disorientation in Aviation by : Fred H. Previc
Download or read book Spatial Disorientation in Aviation written by Fred H. Previc and published by AIAA. This book was released on 2004 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Human Vestibulo-ocular Response and Purposive Arm Movements During Gz Centrifuge Stimulation by :
Download or read book Human Vestibulo-ocular Response and Purposive Arm Movements During Gz Centrifuge Stimulation written by and published by . This book was released on 1995 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes a study that investigated the kinematics and final accuracy of human arm movements under normal and increased gravity, the latter produced by rotating subjects in a centrifuge. Subjects were presented with visual targets on a laptop computer screen located above the head and viewed through a periscope, so that the subjects could not see their arm while pointing at the visual target. Gravity levels varied between 1 and 3 gravities. Effects of gravity on final pointing accuracy were quantified by paired comparisons of responses in successive blocks of experimental sessions. Stored data from the sessions were evaluated by a program which yielded the following movement characteristics: time from movement onset to peak velocity, time from peak velocity to movement end, peak velocity, and final position. Results suggest evidence for two different perceptual illusions in hyper-gravity.
Book Synopsis Biological and Medical Research in Space by : David Moore
Download or read book Biological and Medical Research in Space written by David Moore and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: Life Science studies in space were initially driven by the need to explore how man could survive spaceflight conditions; the effects of being launched un der high accelerations, exposed to weightlessness and radiation for different periods of time, and returned to Earth in safety. In order to substantiate the detailed knowledge of potentially adverse effects, many model experiments were launched using organisms which ranged from bacteria, plants, inverte brates, rodents and primates through to man. Although no immediate life threatening effects were found, these experiments can be considered today as the precursors to life science research in space. Many unexplained effects on these life forms were attributed to the condition of weightlessness. Most of them were poorly recorded, poorly published, or left simply with anecdotal information. Only with the advent of Skylab, and later Spacelab, did the idea emerge, and indeed the infrastructure permit, weightlessness to be considered as an ex tended tool for research into some fundamental mechanisms or processes as sociated with the effect of gravity on organisms at all levels. The initial hy pothesis to extrapolate from hypergravity through 1 x g to near 0 x g effects could no longer be retained, since many of the experiment results were seen to contradict the models or theories in the current textbooks of biology and physiology. The past decade has been dedicated primarily to exploratory research.
Book Synopsis Vestibular Stimulation During a Simple Centrifuge Run by :
Download or read book Vestibular Stimulation During a Simple Centrifuge Run written by and published by . This book was released on 1990 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vestibular stimuli throughout a simple centrifuge run are described in this report, which is the first in a report series that is part of our basic research devoted to an Office of Naval Research accelerated research initiative on vestibular transduction. Herein, we compare stimuli throughout the initial angular acceleration with stimuli during the deceleration that ends the run. We provide tables that show differing rates of change of linear and angular acceleration vectors during the acceleration and deceleration, and we discuss the research steps needed to explain disorientation abhorence reactions and spatial orientation perceptions in centrifuge runs. Keywords: Vestibular transduction, Vestibular stimulus, Centrifuge, Semicircular canals, Otoliths. (js).
Book Synopsis A Parametric Study of Vestibular Stimulation During Centrifugation by : Jeremie M. Pouly
Download or read book A Parametric Study of Vestibular Stimulation During Centrifugation written by Jeremie M. Pouly and published by . This book was released on 2006 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) There were four key findings: 1. All measures, except the slow-phase velocity (SPV) peak amplitude of the vestibulo-ocular reflex, decrease significantly between the two experimental days, which demonstrates that significant adaptation is achieved. 2. Large head-angles lead to longer vertical vestibulo-ocular reflex time-constants than smaller angles do, but do not lead to greater adaptation. 3. In the nose-up position, the perceived body-tilt is highly correlated with the true tilt of the gravito-inertial force at mid-chest level. 4. The SPV-peak amplitude and all subjective ratings except body-tilt show significant correlation with the intensity of the cross-coupled stimulus (CCS): the larger the CCS, the stronger the vestibular response.
Book Synopsis Human Response to Vestibular Stimulation and Some Implications to the Flight Environment by : Richard Malcolm
Download or read book Human Response to Vestibular Stimulation and Some Implications to the Flight Environment written by Richard Malcolm and published by . This book was released on 1971 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A mathematical model of adaptation within the vestibulo-ocular system is presented. The output of the model is compared with the results from experiments in which 32 human subjects were rotated in, an earth-horizontal plane, and their responses measured. The mean Long Time Constant of the semicircular canals was found to be 15.0 sec (S.E.M. ± 0.78) and the mean adaptation Time Constant was found to be 73.4 see (S.E.M. ± 3.54). Half the subject population were fighter pilots of the Canadian Armed Forces, and their Vestibular Function was found to be statistically indistinguishable from that of non-flyers. [...].
Book Synopsis Pamphlets on Mentallt Handicapped and Crime by :
Download or read book Pamphlets on Mentallt Handicapped and Crime written by and published by . This book was released on 1980* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cumulated Index Medicus written by and published by . This book was released on 1992 with total page 1444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spaceflight and the Central Nervous System by : Alex P. Michael
Download or read book Spaceflight and the Central Nervous System written by Alex P. Michael and published by Springer Nature. This book was released on 2022-12-28 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book consolidates the current knowledge of how short and long-duration spaceflight affects the anatomy and physiology of the central nervous system. It also incorporates the methodology and constraints of studying the central nervous system in space. Chapters detail advances in imaging techniques available to assess intracranial and intraocular pathology as well as translational medicine with an emphasis on brain cancer and neurodegenerative disease in spaceflight. Additionally, the book offers theoretical background information, tested laboratory protocols, and step-by-step methods for reproducible lab experiments to aid neuroscientists and neurobiologists in laboratory testing and experimentation. Spaceflight and the Central Nervous System is the first to comprehensively include all aspects of spaceflight-induced changes in the central nervous system. It is an invaluable resource for basic and clinical laboratory trainees and researchers in aerospace medicine and physiology or for those looking to gain specific knowledge in spaceflight neuroscience.
Book Synopsis Masters Theses in the Pure and Applied Sciences by : W. H. Shafer
Download or read book Masters Theses in the Pure and Applied Sciences written by W. H. Shafer and published by Plenum Publishing Corporation. This book was released on 1992 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses Listed by Discipline: Aerospace Engineering. Agricultural Economics, Sciences and Engineering. Architechtural Engineering and Urban Planning. Astronomy. Astrophysics. Ceramic Engineering. Communications Engineering and Computer Science. Cryogenic Engineering. Electrical Engineering. Engineering Mechanics. Engineering Physics. Engineering Science. Fuels, Combustion, and Air Pollution. General and Environmental Engineering. Geochemistry and Soil Science. Geological Sciences and Geophysical Engineering. Geology and Earth Science. Geophysics. Industrial Engineering. Marine and Ocean Engineering. Materials Science and Engineering. Mechanical Engineering and Bioengineering. Metallurgy. Meteorology and Atmospheric Science. 17 additional disciplines. Index.
Book Synopsis Principles of Clinical Medicine for Space Flight by : Michael R. Barratt
Download or read book Principles of Clinical Medicine for Space Flight written by Michael R. Barratt and published by Springer Science & Business Media. This book was released on 2008-03-20 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the years, a large body of knowledge has developed regarding the ways in which space flight affects the health of the personnel involved. Now, for the first time, this clinical knowledge on how to diagnose and treat conditions that either develop during a mission or because of a mission has been compiled by Drs. Michael Barratt and Sam L. Pool of the NASA/Johnson Space Center. Complete with detailed information on the physiological and psychological affects of space flight as well as how to diagnose and treat everything from dental concerns to decompression to dermatological problems encountered, this text is a must have for all those associated with aerospace medicine.
Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1965 with total page 914 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Master's Theses Directories written by and published by . This book was released on 1991 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:
