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Ben D Lawson, Angus H Rupert, Braden J McGrath
Astronauts and vestibular patients face analogous challenges to orientation function due to adaptive exogenous (weightlessness-induced) or endogenous (pathology-induced) alterations in the processing of acceleration stimuli. Given some neurovestibular similarities between these challenges, both affected groups may benefit from shared research approaches and adaptation measurement/improvement strategies. This article reviews various past strategies and introduces two plausible ground-based approaches, the first of which is a method for eliciting and assessing vestibular adaptation-induced imbalance...
2016: Frontiers in Systems Neuroscience
A M Cebolla, M Petieau, B Dan, L Balazs, J McIntyre, G Cheron
Human brain adaptation in weightlessness follows the necessity to reshape the dynamic integration of the neural information acquired in the new environment. This basic aspect was here studied by the electroencephalogram (EEG) dynamics where oscillatory modulations were measured during a visuo-attentional state preceding a visuo-motor docking task. Astronauts in microgravity conducted the experiment in free-floating aboard the International Space Station, before the space flight and afterwards. We observed stronger power decrease (~ERD: event related desynchronization) of the ~10 Hz oscillation from the occipital-parietal (alpha ERD) to the central areas (mu ERD)...
November 24, 2016: Scientific Reports
Irina V Ogneva, Stepan N Belyakin, Svetlana V Sarantseva
In prospective human exploration of outer space, the need to preserve a species over several generations under changed gravity conditions may arise. This paper demonstrates our results in the creation of the third generation of fruit fly Drosophila melanogaster (third-stage larvae) during the 44.5-day space flight (Foton-M4 satellite (2014, Russia)), then the fourth generation on Earth and the fifth generation again in conditions of the 12-day space flight (2014, in the Russian Segment of the ISS). The species preserves fertility despite a number of changes in the level of expression and content of cytoskeletal proteins, which are the key components of the cleavage spindle and the contractile ring of cells...
2016: PloS One
Andrew W Kirkpatrick, Jessica Lynn McKee, Homer Tien, Anthony J LaPorta, Kit Lavell, Tim Leslie, David R King, Paul B McBeth, Susan Brien, Derek J Roberts, Reginald Franciose, Jonathan Wong, Vivian McAlistatair, Danielle Bouchard, Chad G Ball
INTRODUCTION: Torso bleeding remains the most preventable cause of post-traumatic death worldwide. Remote Damage Control Resuscitation (RDCR) endeavours to rescue the most catastrophically injured, but has not focused on pre-hospital surgical torso haemorrhage control (HC). We examined the logistics and metrics of intra-peritoneal packing in weightlessness in Parabolic flight (0g) compared to terrestrial gravity (1g) as an extreme example of surgical RDCR. METHODS: A surgical simulator was customized with high-fidelity intra-peritoneal anatomy, a "blood" pump and flow-meter...
October 25, 2016: Journal of Trauma and Acute Care Surgery
Hailong Chen, Ke Lv, Zhongquan Dai, Guohua Ji, Tingmei Wang, Yanli Wang, Yongliang Zhang, Guanghan Kan, Yinghui Li, Lina Qu
OBJECTIVE: To investigate the expression of memory-related antioxidant genes and miRNAs under simulated weightlessness and the regulation of mechano growth factor (MGF) E domain, the peptide preventing nerve damage. RESULTS: Igf-iea and mgf mRNA levels, expression of antioxidant genes sod1 and sod2 and levels of miR-134 and miR-125b-3p increased in rat hippocampus after 14 days tail suspension to simulate weightlessness which was inhibited with intramuscular injection of E domain peptide...
September 13, 2016: Biotechnology Letters
M Janmaleki, M Pachenari, S M Seyedpour, R Shahghadami, A Sanati-Nezhad
This study focused on the effects of simulated microgravity (s-μg) on mechanical properties, major cytoskeleton biopolymers, and morphology of endothelial cells (ECs). The structural and functional integrity of ECs are vital to regulate vascular homeostasis and prevent atherosclerosis. Furthermore, these highly gravity sensitive cells play a key role in pathogenesis of many diseases. In this research, impacts of s-μg on mechanical behavior of human umbilical vein endothelial cells were investigated by utilizing a three-dimensional random positioning machine (3D-RPM)...
2016: Scientific Reports
Li-Fan Zhang, Shu Zhang
It has been shown that the minimum gravity exposure requirements vary greatly among different physiological systems. A preliminary comparison between two extremes, vessels vs. bones, shows that not only the mechanostat at the tissue level differs greatly, but also the bone loss during weightlessness may also involve calcium deposition-resorption changes. It seems that the surprising efficacy of intermittent artificial gravity (IAG) is due to the vascular tissues possessing a strong resilience or "memory" function toward restoring their original pre-stress and tensegrity state at the 1 G environment...
August 25, 2016: Sheng Li Xue Bao: [Acta Physiologica Sinica]
Roman Goulard, Jean-Louis Vercher, Stéphane Viollet
Insects' aptitude to perform hovering, automatic landing and tracking tasks involves accurately controlling their head and body roll and pitch movements, but how this attitude control depends on an internal estimation of gravity orientation is still an open question. Gravity perception in flying insects has mainly been studied in terms of grounded animals' tactile orientation responses, but it has not yet been established whether hoverflies use gravity perception cues to detect a nearly weightless state at an early stage...
August 15, 2016: Journal of Experimental Biology
Clément N Gambelli, Daniel Theisen, Patrick A Willems, Bénédicte Schepens
Landing on the ground on one's feet implies that the energy gained during the fall be dissipated. The aim of this study is to assess human motor control of landing in different conditions of fall initiation, simulated gravity and sensory neural input. Six participants performed drop-landings using a trap-door system and landings from self-initiated counter-movement jumps in microgravity conditions, simulated in a weightlessness environment by different pull-down forces, of 1-, 0.6-, 0.4- and 0.2 g. External forces applied to the body, orientation of the lower limb segments and muscular activity of 6 lower limb muscles were recorded synchronously...
August 11, 2016: Journal of Applied Physiology
Michael D Delp, Jacqueline M Charvat, Charles L Limoli, Ruth K Globus, Payal Ghosh
As multiple spacefaring nations contemplate extended manned missions to Mars and the Moon, health risks could be elevated as travel goes beyond the Earth's protective magnetosphere into the more intense deep space radiation environment. The primary purpose of this study was to determine whether mortality rates due to cardiovascular disease (CVD), cancer, accidents and all other causes of death differ in (1) astronauts who never flew orbital missions in space, (2) astronauts who flew only in low Earth orbit (LEO), and (3) Apollo lunar astronauts, the only humans to have traveled beyond Earth's magnetosphere...
2016: Scientific Reports
Hong-Wei Zhao, Jun Zhao, Lian-Na Hu, Jing-Nan Liang, Yuan-Yuan Shi, Chuang Nie, Chang-Yu Qiu, Xin-Shuai Nan, Yu-Xin Li, Fu-Lin Gao, Yi Liu, Yu Dong, Ling Luo
AIM: To evaluate the effect of long-term weightlessness on retina and optic nerve in tail-suspension (TS) rats. METHODS: A stimulated weightlessness model was established by suspending rats' tail. After 12wk, the ultrastructure and the number of optic nerve axons were observed by transmission electron microscope. The number of survival retinal ganglion cells (RGCs) was calculated by fluorescent gold retrograde labeling. Retina cells apoptosis was detected by TUNEL staining...
2016: International Journal of Ophthalmology
Urszula T Iwaniec, Russell T Turner
Weight-dependent loading of the skeleton plays an important role in establishing and maintaining bone mass and strength. This review focuses on mechanical signaling induced by body weight as an essential mechanism for maintaining bone health. In addition, the skeletal effects of deviation from normal weight are discussed. The magnitude of mechanical strain experienced by bone during normal activities is remarkably similar among vertebrates, regardless of size, supporting the existence of a conserved regulatory mechanism, or mechanostat, that senses mechanical strain...
September 2016: Journal of Endocrinology
G Clément, W H Paloski, J Rittweger, D Linnarsson, M P Bareille, E Mulder, F L Wuyts, J Zange
OBJECTIVES: We review the studies that have evaluated intermittent short-radius centrifugation as a potential countermeasure for cardiovascular, musculoskeletal, and sensorimotor deconditioning in simulated weightlessness. METHODS: The findings from 18 experimental protocols that have used bed rest and dry immersion for comparing the protective effects of centrifugation versus standing upright or walking, and the effects of continuous vs. periodic exposure to centrifugation are discussed...
June 7, 2016: Journal of Musculoskeletal & Neuronal Interactions
D V Lychakov
The review contains data on functional shifts in fishes, amphibians and birds caused by changes in the otolith system operation after stay under weightlessness conditions. These data are of theoretical and practical significance and are important to resolve some fundamental problems of vestibulogy. The analysis of the results of space experiments has shown that weightlessness conditions do not exert a substantial impact on formation and functional state of the otolith system in embryonic fishes, amphibians and birds developed during space flight...
January 2016: Zhurnal Evoliutsionnoĭ Biokhimii i Fiziologii
O A Zhuravlyova, A A Markin, D S Kuzichkin, V I Loginov, I V Zabolotskaya, L V Vostrikova
In blood serum of 9 volunteers aged 27 to 42, participated in the experiment with 370-day antiorthostatic hypokinesia (-5 degrees), the lipid peroxidation derivates concentration--diene conjugates (DC), malonic dialdehyde (MDA), Schiff bases (SB) as well as antioxidant defense system indices--tocopherol (TP) concentration and total antioxidative activity level (AOA) were measured. The volunteers were divided into two groups subjected to physical training regimes and used prophylactic measures. In both groups the lipoperoxidation processes initial stages depression (by 54-73%) was observed starting from 50th day, thus the lipid peroxidation final product--SB level was decreased (by 50-61%) only to the 230 day and remains approximately at the same level till the end of the experiment...
January 2016: Fiziologiia Cheloveka
Guo-Hui Zhong, Shu-Kuan Ling, Ying-Xian Li
Cardiac remodeling is the heart's response to external or internal stimuli. Weightlessness/simulated weightlessness leads to cardiac atrophy and heart function declining. Understanding the mechanism of cardiac atrophy under weightlessness is important to help astronaut recover from unloading-induced cardiovascular changes after spaceflight. Unloading-induced changes of hemodynamics, metabolic demands and neurohumoral regulation contribute to cardiac atrophy and function declining. During this process, Ca(2+)-related signaling, NF-κB signaling, ERK signaling, ubiquitin-proteasome pathway and autophagy are involved in weightlessness-induced cardiac atrophy...
April 25, 2016: Sheng Li Xue Bao: [Acta Physiologica Sinica]
Wang Qiong, Zhang Yong-Liang, Li Ying-Hui, Chen Shan-Guang, Gao Jiang-Hui, Chen Yi-Xi, Jiang Ning, Liu Xin-Min
ETHNOPHARMACOLOGICAL RELEVANCE: It is vital for astronauts to develop effective countermeasures to prevent their decline of cognitive performance in microgravity to make space-flight missions successful. The traditional Chinese herbal formula Kai Xin San (KXS) has been used to treat amnesia for thousands years. It is a traditional complex prescription comprising of ginseng (Panax ginseng C. A. Meyer), hoelen (Poria cocos (Schw.) Wolf), polygala (Polygala tenaifolia Willd), and acorus (Acorus tatarinowii Schott)...
July 1, 2016: Journal of Ethnopharmacology
Aurore Bourrelly, Joseph McIntyre, Cédric Morio, Pascal Despretz, Marion Luyat
We investigated the role of the visual eye-height (VEH) in the perception of affordance during short-term exposure to weightlessness. Sixteen participants were tested during parabolic flight (0g) and on the ground (1g). Participants looked at a laptop showing a room in which a doorway-like aperture was presented. They were asked to adjust the opening of the virtual doorway until it was perceived to be just wide enough to pass through (i.e., the critical aperture). We manipulated VEH by raising the level of the floor in the visual room by 25 cm...
2016: PloS One
T Macaluso, C Bourdin, F Buloup, M-L Mille, P Sainton, F R Sarlegna, V Taillebot, J-L Vercher, P Weiss, L Bringoux
Astronauts' training is conventionally performed in a pool to reproduce weightlessness by exploiting buoyancy which is supposed to reduce the impact of gravity on the body. However, this training method has not been scientifically validated yet, and requires first to study the effects of underwater exposure on motor behavior. We examined the influence of neutral buoyancy on kinematic features of whole-body reaching underwater and compared them with those produced on land. Eight professional divers were asked to perform arm reaching movements toward visual targets while standing...
July 7, 2016: Neuroscience
Daniela Grimm, Jirka Grosse, Markus Wehland, Vivek Mann, Janne Elin Reseland, Alamelu Sundaresan, Thomas Juhl Corydon
Experiencing real weightlessness in space is a dream for many of us who are interested in space research. Although space traveling fascinates us, it can cause both short-term and long-term health problems. Microgravity is the most important influence on the human organism in space. The human body undergoes dramatic changes during a long-term spaceflight. In this review, we will mainly focus on changes in calcium, sodium and bone metabolism of space travelers. Moreover, we report on the current knowledge on the mechanisms of bone loss in space, available models to simulate the effects of microgravity on bone on Earth as well as the combined effects of microgravity and cosmic radiation on bone...
June 2016: Bone
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