2022
DOI: 10.3233/ves-210016
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Long-duration head down bed rest as an analog of microgravity: Effects on the static perception of upright

Abstract: BACKGROUND: Humans demonstrate many physiological changes in microgravity for which long-duration head down bed rest (HDBR) is a reliable analog. However, information on how HDBR affects sensory processing is lacking. OBJECTIVE: We previously showed (25) that microgravity alters the weighting applied to visual cues in determining the perceptual upright (PU), an effect that lasts long after return. Does long-duration HDBR have comparable effects? METHODS: We assessed static spatial orientation using the luminou… Show more

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Cited by 5 publications
(6 citation statements)
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“…Although a reduced contribution of vision in determining the PU was confirmed, the influence of neutral buoyancy on the PU was not reflected in the relative contributions of body, gravity and vision revealed by a linear weighted sum model. This is disappointing as both long-duration microgravity 16 and head-down bed rest 7 have shown a decline in the ratio of vision:body weightings. Harris and colleagues 16 observed that the VE decreased upon initial exposure to long-duration microgravity (between 9 and 14 days after launch) and showed that this decrease was reflected in significant changes in the ratio of vision:body in terms of a linear weighted vector sum model of the perception of upright.…”
Section: Discussionmentioning
confidence: 99%
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“…Although a reduced contribution of vision in determining the PU was confirmed, the influence of neutral buoyancy on the PU was not reflected in the relative contributions of body, gravity and vision revealed by a linear weighted sum model. This is disappointing as both long-duration microgravity 16 and head-down bed rest 7 have shown a decline in the ratio of vision:body weightings. Harris and colleagues 16 observed that the VE decreased upon initial exposure to long-duration microgravity (between 9 and 14 days after launch) and showed that this decrease was reflected in significant changes in the ratio of vision:body in terms of a linear weighted vector sum model of the perception of upright.…”
Section: Discussionmentioning
confidence: 99%
“…Neutral buoyancy may impact human perception and performance in a way that may or may not match either Earth-normal behaviour, behaviour in microgravity, or the behaviour found in space analogues such as human centrifugation 2 , microgravity aircraft flight 3 – 6 or long-duration bed rest 7 . Neutral buoyancy also introduces its own complications including distortions in visual perception due to light refraction at the glass-water interface between the participant’s goggles and the water column, and the effects of water pressure on the ears, an effect that is known to contribute to diver disorientation (see 8 and 9 for reviews).…”
Section: Introductionmentioning
confidence: 99%
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“…Останніми роками відсутність механічного навантаження на скелет вивчалась у зв'язку з широким освоєнням космосу й негативним впливом мікрогравітації на стан кісткової тканини в умовах космічного польоту [5][6][7]. Проте в більш ранніх дослідженнях вивчалась роль тривалого ліжкового режиму з розвитком часткового чи повного знерухомлення, що, за даними різних дослідників, призводить до схожих специфічних змін кісткової тканини [1,6,8]. Відомі три типові клінічні ситуації, за яких може спостерігатися ПІ-ОП: неврологічне (травма спинного мозку, перенесений інсульт, нервово-м'язова атрофія тощо) чи м'язове захворювання (м'язова чи міотонічна дистрофія, дерматоміозит чи поліміозит, мітохондріальна міопатія та ін.)…”
Section: результатиunclassified
“…Properly weighted objects may float in neutral buoyancy, but water is not a vacuum, and the resistance of the water column and the inertia of water and its impact on objects does not match the effects experienced in air in a space station or in vacuum during extravehicular microgravity. Neutral buoyancy impacts other aspects of human perception and performance which may or may not match either Earth-normal behavior or behavior experienced in the environment found in other space analogs including human centrifugation 5 , microgravity aircraft flight 6 10 or long-duration bed rest 11 . For example, Glass et al 12 found that participants swayed less following long-duration water immersion compared to performance prior to exposure.…”
Section: Introductionmentioning
confidence: 99%