keyword
MENU ▼
Read by QxMD icon Read
search

weightlessness

keyword
https://www.readbyqxmd.com/read/29663938/cohousing-male-mice-with-and-without-segmental-bone-defects
#1
Jeffrey D Rytlewski, Paul J Childress, David C Scofield, Faisal Khan, Marta B Alvarez, Aamir T Tucker, Jonathan S Harris, Jessica L Peveler, Debra L Hickman, Tien-Min G Chu, Melissa A Kacena
Spaceflight results in bone loss like that associated with osteoporosis or decreased weight-bearing (for example, high-energy trauma such as explosive injuries and automobile accidents). Thus, the unique spaceflight laboratory on the International Space Station presents the opportunity to test bone healing agents during weightlessness. We are collaborating with NASA and the US Army to study bone healing in spaceflight. Given the unique constraints of spaceflight, study design optimization was required. Male mice were selected primarily because their femur is larger than females', allowing for more reproducible surgical outcomes...
April 2, 2018: Comparative Medicine
https://www.readbyqxmd.com/read/29581965/involvement-of-cholinergic-dysfunction-and-oxidative-damage-in-the-effects-of-simulated-weightlessness-on-learning-and-memory-in-rats
#2
Yongliang Zhang, Qiong Wang, Hailong Chen, Xinmin Liu, Ke Lv, Tingmei Wang, Yanli Wang, Guohua Ji, Hongqing Cao, Guanghan Kan, Yinghui Li, Lina Qu
The present study aimed to determine how the learning and memory gradually change with the prolonged hindlimb unloading (HU) treatment in rats. Different HU durations (7 d, 14 d, 21 d, and 28 d) in Sprague-Dawley (SD) rats were implemented. Cognitive function was assessed using the Morris water maze (MWM) and the shuttle box test. Additionally, parameters about cholinergic activity and oxidative stress were tested. Results showed that longer-than-14 d HU led to the inferior performances in the behavioral tasks...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29555246/functional-outcomes-18-months-after-total-and-midarm-transplantation-a-case-report
#3
M Iglesias, M Ramírez-Berumen, P Butrón, J Alberú-Gómez, F Salazar-Hernández, J Macias-Gallardo, R P Leal-Villalpando, J Zamudio-Bautista, V Acosta, L Jauregui, A Hernández-Campos, V Espinosa-Cruz, J Vázquez-Lamadrid, J González-Sánchez, J Cuellar-Rodriguez, J G Sierra-Madero, R Gaytan-Cervantes, S Contreras-Barbosa, A Navarro-Lara, J Guzman-Gonzalez, J Domínguez-Cherit, M Vilatoba, S Toussaint-Caire, F Vega-Boada, F J Gómez-Pérez, M Mayorquin-Ruiz
BACKGROUND: The function reported after arm transplantation is deemed beneficial relative to the marked disability that upper arm amputation causes. OBJECTIVE: We report a 51-year-old man with a Disabilities of the Arm, Shoulder and Hand (DASH) score of 75.83 who underwent bilateral arm transplantation in October 2015. PROCEDURE: The right arm was transplanted at the glenohumeral joint level, including transplantation of the humeral head, joint capsule, and rotator cuff ligaments and tendons...
March 16, 2018: Transplantation Proceedings
https://www.readbyqxmd.com/read/29523302/sleep-and-gravity
#4
Alain A Gonfalone
What is known about sleep results from years of observation at the surface of the Earth. Since a few decade man has been able to reach space, escape from the earth attraction and spend days and nights in a weightless condition. Some major physiological changes have been observed during long stays and in particular the sleep duration in space is shorter than on ground. This paper reviews a novel hypothesis proposing that sleep is partly due to gravity. Gravity is a fundamental part of our environment, but is elusive and difficult to apprehend...
April 2018: Medical Hypotheses
https://www.readbyqxmd.com/read/29506759/modulation-of-shoulder-muscle-and-joint-function-using-a-powered-upper-limb-exoskeleton
#5
Wen Wu, Justin Fong, Vincent Crocher, Peter V S Lee, Denny Oetomo, Ying Tan, David C Ackland
Robotic-assistive exoskeletons can enable frequent repetitive movements without the presence of a full-time therapist; however, human-machine interaction and the capacity of powered exoskeletons to attenuate shoulder muscle and joint loading is poorly understood. This study aimed to quantify shoulder muscle and joint force during assisted activities of daily living using a powered robotic upper limb exoskeleton (ArmeoPower, Hocoma). Six healthy male subjects performed abduction, flexion, horizontal flexion, reaching and nose touching activities...
February 21, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29482297/water-immersion-model-in-nephrology-from-hydrotherapy-to-weightlessness
#6
Jan Dulawa, Michal Kokot
No abstract text is available yet for this article.
February 2018: Giornale Italiano di Nefrologia: Organo Ufficiale Della Società Italiana di Nefrologia
https://www.readbyqxmd.com/read/29393447/simulated-microgravity-hampers-notch-signaling-in-the-fight-against-myocardial-ischemia%C3%A2-reperfusion-injury
#7
Shuai Jiang, Xing-Cheng Zhao, Bo Jiao, Zhi-Jie Yue, Zhi-Bin Yu
The gravitational field is an important determinant of cardiovascular function. Exposure to microgravity during spaceflight may lead to a series of maladaptive alterations in the cardiovascular system. The authors have previously demonstrated that microgravity can increase the susceptibility to myocardial ischemia‑reperfusion (IR) injury under simulated microgravity. Although Notch1 signaling protects against myocardial IR injury, whether Notch1 protects against myocardial IR injury under simulated weightlessness remains unknown...
January 25, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29170507/increased-core-body-temperature-in-astronauts-during-long-duration-space-missions
#8
Alexander C Stahn, Andreas Werner, Oliver Opatz, Martina A Maggioni, Mathias Steinach, Victoria Weller von Ahlefeld, Alan Moore, Brian E Crucian, Scott M Smith, Sara R Zwart, Thomas Schlabs, Stefan Mendt, Tobias Trippel, Eberhard Koralewski, Jochim Koch, Alexander Choukèr, Günther Reitz, Peng Shang, Lothar Röcker, Karl A Kirsch, Hanns-Christian Gunga
Humans' core body temperature (CBT) is strictly controlled within a narrow range. Various studies dealt with the impact of physical activity, clothing, and environmental factors on CBT regulation under terrestrial conditions. However, the effects of weightlessness on human thermoregulation are not well understood. Specifically, studies, investigating the effects of long-duration spaceflight on CBT at rest and during exercise are clearly lacking. We here show that during exercise CBT rises higher and faster in space than on Earth...
November 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29163225/human-locomotion-in-hypogravity-from-basic-research-to-clinical-applications
#9
REVIEW
Francesco Lacquaniti, Yury P Ivanenko, Francesca Sylos-Labini, Valentina La Scaleia, Barbara La Scaleia, Patrick A Willems, Myrka Zago
We have considerable knowledge about the mechanisms underlying compensation of Earth gravity during locomotion, a knowledge obtained from physiological, biomechanical, modeling, developmental, comparative, and paleoanthropological studies. By contrast, we know much less about locomotion and movement in general under sustained hypogravity. This lack of information poses a serious problem for human space exploration. In a near future humans will walk again on the Moon and for the first time on Mars. It would be important to predict how they will move around, since we know that locomotion and mobility in general may be jeopardized in hypogravity, especially when landing after a prolonged weightlessness of the space flight...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29163058/adaptive-changes-in-the-vestibular-system-of-land-snail-to-a-30-day-spaceflight-and-readaptation-on-return-to-earth
#10
Nikolay Aseyev, Alia Kh Vinarskaya, Matvey Roshchin, Tatiana A Korshunova, Aleksey Yu Malyshev, Alena B Zuzina, Victor N Ierusalimsky, Maria S Lemak, Igor S Zakharov, Ivan A Novikov, Peter Kolosov, Ekaterina Chesnokova, Svetlana Volkova, Artem Kasianov, Leonid Uroshlev, Yekaterina Popova, Richard D Boyle, Pavel M Balaban
The vestibular system receives a permanent influence from gravity and reflexively controls equilibrium. If we assume gravity has remained constant during the species' evolution, will its sensory system adapt to abrupt loss of that force? We address this question in the land snail Helix lucorum exposed to 30 days of near weightlessness aboard the Bion-M1 satellite, and studied geotactic behavior of postflight snails, differential gene expressions in statocyst transcriptome, and electrophysiological responses of mechanoreceptors to applied tilts...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/29157342/molecular-biological-effects-of-weightlessness-and-hypergravity-on-intervertebral-disc-degeneration
#11
Di Wu, Chao Zheng, Ji Wu, Rongrong Huang, Xuanyu Chen, Tong Zhang, Lili Zhang
INTRODUCTION: The rate of intervertebral disc degeneration (IVDD) is influenced by environmental factors. Extracellular matrix (ECM) destruction and apoptosis of intervertebral disc cells are major characteristics of IVDD. ECM degradation is closely linked to up-regulation of matrix metalloproteinases (MMPs) and tissue inhibitors of MMPs (TIMP). This study aimed to elucidate the molecular biological changes during IVDD under conditions of weightlessness and hypergravity. METHODS: A total of 120 rabbits were divided randomly into four groups: control group, weightlessness group, hypergravity group, and mixed (hypergravity + weightlessness) group...
December 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/29153458/thigh-cuffs-as-a-countermeasure-for-ocular-changes-in-simulated-weightlessness
#12
Siva Balasubramanian, Tudor Tepelus, Michael B Stenger, Stuart M C Lee, Steven S Laurie, John H K Liu, Alan H Feiveson, SriniVas R Sadda, Alex S Huang, Brandon R Macias
No abstract text is available yet for this article.
November 16, 2017: Ophthalmology
https://www.readbyqxmd.com/read/29104544/sensorimotor-reorganizations-of-arm-kinematics-and-postural-strategy-for-functional-whole-body-reaching-movements-in-microgravity
#13
Thomas Macaluso, Christophe Bourdin, Frank Buloup, Marie-Laure Mille, Patrick Sainton, Fabrice R Sarlegna, Jean-Louis Vercher, Lionel Bringoux
Understanding the impact of weightlessness on human behavior during the forthcoming long-term space missions is of critical importance, especially when considering the efficiency of goal-directed movements in these unusual environments. Several studies provided a large set of evidence that gravity is taken into account during the planning stage of arm reaching movements to optimally anticipate its consequence upon the moving limbs. However, less is known about sensorimotor changes required to face weightless environments when individuals have to perform fast and accurate goal-directed actions with whole-body displacement...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29081752/multi-system-deconditioning-in-3-day-dry-immersion-without-daily-raise
#14
Steven De Abreu, Liubov Amirova, Ronan Murphy, Robert Wallace, Laura Twomey, Guillemette Gauquelin-Koch, Veronique Raverot, Françoise Larcher, Marc-Antoine Custaud, Nastassia Navasiolava
Dry immersion (DI) is a Russian-developed, ground-based model to study the physiological effects of microgravity. It accurately reproduces environmental conditions of weightlessness, such as enhanced physical inactivity, suppression of hydrostatic pressure and supportlessness. We aimed to study the integrative physiological responses to a 3-day strict DI protocol in 12 healthy men, and to assess the extent of multi-system deconditioning. We recorded general clinical data, biological data and evaluated body fluid changes...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29081428/motor-imagery-of-body-movements-that-can-t-be-executed-on-earth
#15
Michael Kalicinski, Otmar Bock, Nadja Schott
BACKGROUND: Before participating in a space mission, astronauts undergo parabolic-flight and underwater training to facilitate their subsequent adaptation to weightlessness. A quick, simple and inexpensive alternative could be training by motor imagery (MI). OBJECTIVE: An important prerequisite for this training approach is that humans are able to imagine movements which are unfamiliar, since they can't be performed in the presence of gravity. Our study addresses this prerequisite...
2017: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/29079684/spaceflight-induced-changes-in-white-matter-hyperintensity-burden-in-astronauts
#16
Noam Alperin, Ahmet M Bagci, Sang H Lee
OBJECTIVE: To assess the effect of weightlessness and the respective roles of CSF and vascular fluid on changes in white matter hyperintensity (WMH) burden in astronauts. METHODS: We analyzed prespaceflight and postspaceflight brain MRI scans from 17 astronauts, 10 who flew a long-duration mission on the International Space Station (ISS) and 7 who flew a short-duration mission on the Space Shuttle. Automated analysis methods were used to determine preflight to postflight changes in periventricular and deep WMH, CSF, and brain tissue volumes in fluid-attenuated inversion recovery and high-resolution 3-dimensional T1-weighted imaging...
November 21, 2017: Neurology
https://www.readbyqxmd.com/read/29075198/impacts-of-simulated-weightlessness-by-dry-immersion-on-optic-nerve-sheath-diameter-and-cerebral-autoregulation
#17
Marc Kermorgant, Florian Leca, Nathalie Nasr, Marc-Antoine Custaud, Thomas Geeraerts, Marek Czosnyka, Dina N Arvanitis, Jean-Michel Senard, Anne Pavy-Le Traon
Dry immersion (DI) is used to simulate weightlessness. We investigated in healthy volunteers if DI induces changes in ONSD, as a surrogate marker of intracranial pressure (ICP) and how these changes could affect cerebral autoregulation (CA). Changes in ICP were indirectly measured by changes in optic nerve sheath diameter (ONSD). 12 healthy male volunteers underwent 3 days of DI. ONSD was indirectly assessed by ocular ultrasonography. Cerebral blood flow velocity (CBFV) of the middle cerebral artery was gauged using transcranial Doppler ultrasonography...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29053152/heart-in-space-effect-of-the-extraterrestrial-environment-on-the-cardiovascular-system
#18
REVIEW
Richard L Hughson, Alexander Helm, Marco Durante
National space agencies and private corporations aim at an extended presence of humans in space in the medium to long term. Together with currently suboptimal technology, microgravity and cosmic rays raise health concerns about deep-space exploration missions. Both of these physical factors affect the cardiovascular system, whose gravity-dependence is pronounced. Heart and vascular function are, therefore, susceptible to substantial changes in weightlessness. The altered cardiovascular function in space causes physiological problems in the postflight period...
March 2018: Nature Reviews. Cardiology
https://www.readbyqxmd.com/read/29046415/skeletal-stiffening-in-an-amphibious-fish-out-of-water-is-a-response-to-increased-body-weight
#19
Andy J Turko, Dietmar Kültz, Douglas Fudge, Roger P Croll, Frank M Smith, Matthew R Stoyek, Patricia A Wright
Terrestrial animals must support their bodies against gravity, while aquatic animals are effectively weightless because of buoyant support from water. Given this evolutionary history of minimal gravitational loading of fishes in water, it has been hypothesized that weight-responsive musculoskeletal systems evolved during the tetrapod invasion of land and are thus absent in fishes. Amphibious fishes, however, experience increased effective weight when out of water - are these fishes responsive to gravitational loading? Contrary to the tetrapod-origin hypothesis, we found that terrestrial acclimation reversibly increased gill arch stiffness (∼60% increase) in the amphibious fish Kryptolebias marmoratus when loaded normally by gravity, but not under simulated microgravity...
October 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28933017/present-uses-future-applications-and-technical-underpinnings-of-electrical-impedance-myography
#20
REVIEW
Benjamin Sanchez, Seward B Rutkove
PURPOSE OF REVIEW: In this article, we provide an overview of electrical impedance myography (EIM), including its technical and theoretical basis, a summary of its varied applications, and ongoing developments. RECENT FINDINGS: EIM has been used as a disease severity biomarker in a variety of disorders affecting the muscle, ranging from amyotrophic lateral sclerosis (ALS) to muscular dystrophies to disuse atrophy due to the weightlessness of space. In ALS, studies have demonstrated that major reductions in sample size in clinical trials can be achieved...
September 20, 2017: Current Neurology and Neuroscience Reports
keyword
keyword
96386
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"