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Pesquisa : G01.060.350.369 [Categoria DeCS]
Referências encontradas : 363 [refinar]
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[PMID]:29196770
[Au] Autor:Kim DY; Song J; Kim JY; Choi K; Hyung S; Chae JB
[Ad] Endereço:Department of Ophthalmology, Chungbuk National University Hospital, College of Medicine, Chungbuk National University, Cheongju, Korea.
[Ti] Título:Effect of Gravity Acceleration on Choroidal and Retinal Nerve Fiber Layer Thickness: A Swept-Source Optical Coherence Tomography Study.
[So] Source:Invest Ophthalmol Vis Sci;58(14):6050-6055, 2017 Dec 01.
[Is] ISSN:1552-5783
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Purpose: The purpose of this study was to evaluate the effect of gravity acceleration on choroidal and retinal nerve fiber layer (RNFL) thickness using swept-source optical coherence tomography (SS-OCT). Methods: Thirteen healthy volunteers who planned to participate in human centrifuge training as part of the flight surgeon selection process enrolled this study. During centrifuge training, gravity was gradually increased up to six times that of sea level. All subjects underwent complete ophthalmologic examination and three-dimensional wide-scanning SS-OCT imaging (DRI OCT-1 Atlantis; Topcon, Tokyo, Japan). Imaging was performed before (baseline), immediately after, and 15, 30, and 60 minutes after centrifuge training. Changes in choroidal thickness, choroidal volume, retinal thickness, and RNFL thickness after centrifuge training were analyzed. Results: Mean choroidal thickness significantly and transiently decreased immediately (258.19 ± 73.54 µm, P < 0.001), 15 minutes (258.54 ± 75.12 µm, P = 0.001), and 30 minutes (254.31 ± 66.92, P = 0.001) after human centrifuge training, relative to baseline (273.35 ± 80.80 µm). However, the decreased choroidal thickness returned to baseline levels 1 hour after centrifuge training (270.12 ± 71.69 µm, P = 0.437). Mean retinal thickness and RNFL thickness were not significantly affected by human centrifuge training. In participants who suffered from gravity-force induced loss of consciousness (G-LOC) during training, the amount of the choroidal thickness decrease was larger than in participants who did not experience G-LOC. However, because of the small sample size, the difference, although large, was not statistically significant. Conclusions: Choroidal thickness and volume significantly and transiently decreased after human centrifuge training, which might reflect that choroidal perfusion was transiently decreased during human centrifuge training. Considering choroidal thickness decreased after human centrifuge training, long-term exposure to a high gravity environment may lead to ischemic injury to ocular structures.
[Mh] Termos MeSH primário: Aceleração
Corioide/citologia
Gravidade Alterada
Células Ganglionares da Retina/citologia
Tomografia de Coerência Óptica/métodos
[Mh] Termos MeSH secundário: Adulto
Voluntários Saudáveis
Seres Humanos
Imagem Tridimensional
Masculino
Fibras Nervosas
Estudos Prospectivos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171211
[Lr] Data última revisão:
171211
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171203
[St] Status:MEDLINE
[do] DOI:10.1167/iovs.17-21994


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[PMID]:28818141
[Au] Autor:Zhang Q; Evans JM; Stenger MB; Moore FB; Knapp CF
[Ti] Título:Autonomic Cardiovascular Responses to Orthostatic Stress After a Short Artificial Gravity Exposure.
[So] Source:Aerosp Med Hum Perform;88(9):827-833, 2017 Sep 01.
[Is] ISSN:2375-6314
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Intermittent artificial gravity (AG) training over days and weeks has been shown to improve the human orthostatic tolerance limit (OTL) and improve cardiovascular regulation in response to orthostatic stress. Effects of a single AG exposure are currently unknown. METHODS: We tested cardiovascular responses to orthostatic stress in 16 hypovolemic subjects (9 men and 7 women), once following a single, short (∼90 min) bout of AG and once following a similar period of head-down bed rest (HDBR). Hypovolemia was produced by intravenous furosemide infusion (20 mg) and orthostatic stress was produced by combined 70° head-up tilt (HUT) and progressively increasing lower body negative pressure until symptoms of presyncope developed. To assess reflex-induced changes in cardiovascular regulation, heart rate and blood pressure variability were analyzed by spectral analysis and baroreflex activity was evaluated by transfer function analysis. RESULTS: Compared to HDBR, a short AG exposure increased men's low frequency (0.04-0.15 Hz) power of systolic blood pressure (SBPLF), but did not change women's SBPLF responses to orthostatic stress. In response to 70° HUT, compared to supine, low frequency phase delay (PhaseLF) between systolic blood pressure and RR intervals increased by ∼20% following HDBR, but did not change following AG, reflecting improved baroreflex activity at a milder level of orthostatic stress after AG. CONCLUSIONS: These results indicate that a short bout of AG increased both sympathetic and baroreflex responsiveness to orthostatic stress in hypovolemia-induced, cardiovascular-deconditioned men and women, which may contribute to the AG-induced improvement of OTL shown in our previous reports.Zhang Q, Evans JM, Stenger MB, Moore FB, Knapp CF. Autonomic cardiovascular responses to orthostatic stress after a short artificial gravity exposure. Aerosp Med Hum Perform. 2017; 88(9):827-833.
[Mh] Termos MeSH primário: Sistema Nervoso Autônomo/fisiologia
Descondicionamento Cardiovascular/fisiologia
Gravidade Alterada
Decúbito Inclinado com Rebaixamento da Cabeça/fisiologia
[Mh] Termos MeSH secundário: Adulto
Barorreflexo/fisiologia
Repouso em Cama
Pressão Sanguínea/fisiologia
Feminino
Frequência Cardíaca/fisiologia
Hemodinâmica/fisiologia
Seres Humanos
Hipovolemia/fisiopatologia
Pressão Negativa da Região Corporal Inferior
Masculino
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171010
[Lr] Data última revisão:
171010
[Sb] Subgrupo de revista:IM; S
[Da] Data de entrada para processamento:170819
[St] Status:MEDLINE
[do] DOI:10.3357/AMHP.4811.2017


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[PMID]:28818139
[Au] Autor:Paloski WH; Reschke MF; Feiveson AH
[Ti] Título:Bed Rest and Intermittent Centrifugation Effects on Human Balance and Neuromotor Reflexes.
[So] Source:Aerosp Med Hum Perform;88(9):812-818, 2017 Sep 01.
[Is] ISSN:2375-6314
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:INTRODUCTION: The effects of repeated centrifugation in association with head-down tilt (HDT) bed rest (BR) on the mediation of basic reflexes associated with the major postural muscles was investigated as a potential countermeasure for maintaining balance control and neuromotor reflex function. METHODS: There were 15 male volunteers who were exposed to 21 d of 6° HDT-BR. Eight were treated with daily 1-h artificial gravity (AG) exposures aboard a short radius centrifuge that provided 1-g footward loading at heart level. The other seven served as HDT-BR control subjects. Balance control was assessed using a standard computerized dynamic posturography (CDP) protocol that was modified by adding low-frequency pitch-plane head movements. Neuromotor reflex function was assessed using tendon stretch reflexes (MSR) and functional stretch reflex (FSR) data collected from the triceps surae muscle group. RESULTS: CDP performance was degraded by HDT-BR in both groups (ranging from 24 to 26%), but was unaffected by AG. BR also degraded MSR and FSR functions in both groups, with increased peak reflex latencies between 1.5 and 1.95 ms, but AG maintained pre-BR latencies for the MSR subjects. DISCUSSION: AG exposure did not modify balance control from pre-BR responses, but did help prevent decrements in FSR latencies post-BR.Paloski WH, Reschke MF, Feiveson AH. Bed rest and intermittent centrifugation effects on human balance and neuromotor reflexes. Aerosp Med Hum Perform. 2017; 88(9):812-818.
[Mh] Termos MeSH primário: Repouso em Cama
Gravidade Alterada
Decúbito Inclinado com Rebaixamento da Cabeça/fisiologia
Intolerância Ortostática/fisiopatologia
Equilíbrio Postural/fisiologia
Reflexo de Estiramento/fisiologia
[Mh] Termos MeSH secundário: Adaptação Fisiológica
Adulto
Voluntários Saudáveis
Seres Humanos
Masculino
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171010
[Lr] Data última revisão:
171010
[Sb] Subgrupo de revista:IM; S
[Da] Data de entrada para processamento:170819
[St] Status:MEDLINE
[do] DOI:10.3357/AMHP.4819.2017


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[PMID]:28490676
[Au] Autor:Heacox HN; Gillman PL; Zwart SR; Smith SM
[Ad] Endereço:Department of Chemistry, University of Central Arkansas, Conway, AR.
[Ti] Título:Excretion of Zinc and Copper Increases in Men during 3 Weeks of Bed Rest, with or without Artificial Gravity.
[So] Source:J Nutr;147(6):1113-1120, 2017 Jun.
[Is] ISSN:1541-6100
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Zinc and copper have many physiologic functions and little or no functional storage capability, so persistent losses of either element present health concerns, especially during extended-duration space missions. We evaluated the effects of short-term bed rest (BR), a spaceflight analog, on copper and zinc metabolism to better understand the role of these nutrients in human adaptation to (simulated) spaceflight. We also investigated the effect of artificial gravity on copper and zinc homeostasis. Zinc and copper balances were studied in 15 men [mean ± SD age: 29 ± 3 y; body mass index (in kg/m ): 26.4 ± 2.2] before, during, and after 21 d of head-down tilt BR, during which 8 of the participants were subjected to artificial gravity (AG) by centrifugation for 1 h/d. Control subjects were transferred onto the centrifuge but were not exposed to centrifugation. The study was conducted in a metabolic ward; all urine and feces were collected. Data were analyzed by 2-factor repeated-measures ANOVA. Urinary zinc excretion values for control and AG groups were 33% and 14%, respectively, higher during BR than before BR, and fecal zinc excretion values for control and AG groups were 36% and 19%, respectively, higher during BR, resulting in 67% and 82% lower net zinc balances for controls and AG, respectively (both < 0.01), despite lower nutrient intake during BR. Fecal copper values for control and AG groups were 40% and 33%, respectively, higher during BR than before BR ( 0.01 for both). Urinary copper did not change during BR, but a 19% increase was observed after compared with before BR in the AG group ( 0.05). The increased fecal excretion of copper and zinc by men during BR suggests that their absorption of these minerals from the diet was reduced, secondary to the release of minerals from bone and muscle. These findings highlight the importance of determining dietary requirements for astronauts on space missions and ensuring provision and intake of all nutrients.
[Mh] Termos MeSH primário: Adaptação Fisiológica
Repouso em Cama
Cobre/metabolismo
Gravidade Alterada
Decúbito Inclinado com Rebaixamento da Cabeça
Voo Espacial
Zinco/metabolismo
[Mh] Termos MeSH secundário: Adulto
Astronautas
Osso e Ossos/metabolismo
Fezes
Homeostase
Seres Humanos
Absorção Intestinal
Masculino
Músculos/metabolismo
Necessidades Nutricionais
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
789U1901C5 (Copper); J41CSQ7QDS (Zinc)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170705
[Lr] Data última revisão:
170705
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170512
[St] Status:MEDLINE
[do] DOI:10.3945/jn.117.247437


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[PMID]:27135470
[Au] Autor:Carvil PA; Attias J; Evetts SN; Waldie JM; Green DA
[Ad] Endereço:1Centre of Human & Aerospace Physiological Sciences, King's College London, London, United Kingdom; 2Wyle GmbH, Cologne, Germany; and 3RMIT University, Melbourne, Australia.
[Ti] Título:The Effect of the Gravity Loading Countermeasure Skinsuit Upon Movement and Strength.
[So] Source:J Strength Cond Res;31(1):154-161, 2017 Jan.
[Is] ISSN:1533-4287
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Carvil, PA, Attias, J, Evetts, SN, Waldie, JM, and Green, DA. The effect of the gravity loading countermeasure skinsuit upon movement and strength. J Strength Cond Res 31(1): 154-161, 2017-Effective countermeasures against musculoskeletal deconditioning induced by microgravity and disuse are required. A simple alternative to provision of artificial gravity by centrifugation is compressive axial loading. The Russian "Pingvin" suit was the first wearable suit to apply this concept using bungee cords tethered around the shoulders and feet. However, poor loading characteristics and severe thermal and movement discomfort were reported. The gravity loading countermeasure skinsuit (GLCS) uses a bidirectional weave to generate staged axial loading from shoulders to feet, better mimicking how Earth's gravity induces progressive loading head to foot. The Mk III GLCS's loading was evaluated and tolerability assessed during maximal joint motion, ambulation, and selected strength exercises. Eight subjects (5 male and 3 female; 28 ± 3 years; 179 ± 0.1 cm and 74.8 ± 2.9 kg), having given written informed consent, had an Mk III GLCS individually tailored. Axial loading imparted, body height, joint range of motion (ROM), ambulation, and strength tests (12 repetition maximum) were performed in the GLCS and gym attire, with subjective (rating of perceived exertion, thermal comfort, movement discomfort and body control) ratings recorded throughout. Gravity loading countermeasure skinsuit provided significant axial loading when standing but significantly reduced knee (-13°), spinal (-28°) and shoulder flexion/extension ROM (-34°/-13°), in addition to Sit and Reach (-12.8 cm). No thermal issues were reported but there was an increase in subjective discomfort. Gravity loading countermeasure skinsuit did not significantly impede strength exercise, with the exception of shoulder press. The GLCS (Mk III) demonstrates potential as a countermeasure by providing tolerable, static axial loading. Furthermore, it may serve as an elasticlike strength exercise adjunct, which may have utility as a rehabilitation modality after further design refinement.
[Mh] Termos MeSH primário: Exercício/fisiologia
Trajes Gravitacionais
Amplitude de Movimento Articular/fisiologia
Contramedidas de Ausência de Peso
[Mh] Termos MeSH secundário: Adulto
Centrifugação
Feminino
Gravidade Alterada
Seres Humanos
Masculino
Federação Russa
Caminhada
Ausência de Peso
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160503
[St] Status:MEDLINE
[do] DOI:10.1519/JSC.0000000000001460


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[PMID]:27546500
[Au] Autor:Zhang LF; Zhang S
[Ad] Endereço:Departments of Aerospace Physiology, The Fourth Military Medical University, Xi'an 710032, China. zhanglf@fmmu.edu.cn.
[Ti] Título:Systems specificity in responsiveness to intermittent artificial gravity during simulated microgravity in rats.
[So] Source:Sheng Li Xue Bao;68(4):391-402, 2016 Aug 25.
[Is] ISSN:0371-0874
[Cp] País de publicação:China
[La] Idioma:eng
[Ab] Resumo: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. It appears that the bone tissue is related to a more complex tensegrity paradigm involving both osteoblasts and osteoclasts, and a longer half time for calcium deposition-absorption. Cell-level models (CellML) for calcium dynamics is currently available. We hope that the Physiome Project can use this modeling framework to help interpret the resistance of bones to IAG and to evaluate whether the "intermittent" or "continuous" AG scheme should be adopted eventually for future exploration-class spaceflight.
[Mh] Termos MeSH primário: Gravidade Alterada
Simulação de Ausência de Peso
[Mh] Termos MeSH secundário: Animais
Osso e Ossos
Cálcio
Osteoblastos
Osteoclastos
Ratos
Ausência de Peso
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
SY7Q814VUP (Calcium)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160823
[St] Status:MEDLINE


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[PMID]:26773840
[Au] Autor:Jensen BR; Berthelsen MP; Husu E; Christensen SB; Prahm KP; Vissing J
[Ad] Endereço:Biomechanics and Motor Control Laboratory, Integrative Physiology, Department of Nutrition, Exercise and Sport, University of Copenhagen, Nørre Allé 51, DK-2100, Copenhagen, Denmark.
[Ti] Título:Body weight-supported training in Becker and limb girdle 2I muscular dystrophy.
[So] Source:Muscle Nerve;54(2):239-43, 2016 Aug.
[Is] ISSN:1097-4598
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:INTRODUCTION: We studied the functional effects of combined strength and aerobic anti-gravity training in severely affected patients with Becker and Limb-Girdle muscular dystrophies. METHODS: Eight patients performed 10-week progressive combined strength (squats, calf raises, lunges) and aerobic (walk/run, jogging in place or high knee-lift) training 3 times/week in a lower-body positive pressure environment. Closed-kinetic-chain leg muscle strength, isometric knee strength, rate of force development (RFD), and reaction time were evaluated. RESULTS: Baseline data indicated an intact neural activation pattern but showed compromised muscle contractile properties. Training (compliance 91%) improved functional leg muscle strength. Squat series performance increased 30%, calf raises 45%, and lunges 23%. CONCLUSIONS: Anti-gravity training improved closed-kinetic-chain leg muscle strength despite no changes in isometric knee extension strength and absolute RFD. The improved closed-kinetic-chain performance may relate to neural adaptation involving motor learning and/or improved muscle strength of other muscles than the weak knee extensors. Muscle Nerve 54: 239-243, 2016.
[Mh] Termos MeSH primário: Peso Corporal
Terapia por Exercício/métodos
Gravidade Alterada
Locomoção/fisiologia
Distrofia Muscular do Cíngulo dos Membros/fisiopatologia
Distrofia Muscular do Cíngulo dos Membros/reabilitação
[Mh] Termos MeSH secundário: Adolescente
Adulto
Idoso
Feminino
Seres Humanos
Contração Isométrica
Modelos Lineares
Masculino
Meia-Idade
Força Muscular/fisiologia
Equilíbrio Postural
Caminhada
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170627
[Lr] Data última revisão:
170627
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160117
[St] Status:MEDLINE
[do] DOI:10.1002/mus.25039


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[PMID]:26738308
[Au] Autor:Sukhoterin AF; Pashchenko PS; Plakhov NN; Zhuravlev AG
[Ti] Título:[ROLE OF THE SYMPATHOADRENOMEDULLARY SYSTEM IN FORMATION OF PILOT'S ADAPTATION TO FLIGHT LOADS].
[So] Source:Aviakosm Ekolog Med;49(5):49-53, 2015.
[Is] ISSN:0233-528X
[Cp] País de publicação:Russia (Federation)
[La] Idioma:rus
[Ab] Resumo:Purpose of the work was to evaluate the sympathoadrenomedullary functions and associated psychophysiological reactions of pilots as a function of flight hours on highly maneuverable aircraft. Volunteers to the investigation were 78 pilots (41 pilots of maneuverable aircraft and 37 pilots of bombers and transporters). Selected methods were to enable comprehensive evaluation of the body functioning against flight loads. Our results evidence that piloting of high maneuverable aircraft but not of bombing and transporting aircrafts activates the sympathoadrenomedullary system significantly. This is particularly common to young pilots with the total flying time less than 1000 hours. Adaptive changes to flight factors were noted to develop with age and experience.
[Mh] Termos MeSH primário: Adaptação Fisiológica/fisiologia
Glândulas Suprarrenais/fisiologia
Aviação
Gravidade Alterada
Sistema Nervoso Simpático/fisiologia
Carga de Trabalho
[Mh] Termos MeSH secundário: Adulto
Seres Humanos
Masculino
[Pt] Tipo de publicação:ENGLISH ABSTRACT; JOURNAL ARTICLE
[Em] Mês de entrada:1602
[Cu] Atualização por classe:160107
[Lr] Data última revisão:
160107
[Sb] Subgrupo de revista:IM; S
[Da] Data de entrada para processamento:160108
[St] Status:MEDLINE


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[PMID]:26292426
[Au] Autor:Pashchenko PS; Risman BV
[Ti] Título:[MORPHOLOGICAL ASPECTS OF CHANGES IN THE SPINAL GRAY MATTER DUE TO G-LOADS IN EXPERIMENT].
[So] Source:Aviakosm Ekolog Med;49(3):51-5, 2015.
[Is] ISSN:0233-528X
[Cp] País de publicação:Russia (Federation)
[La] Idioma:rus
[Ab] Resumo:To study changes in spinal cord structures brought about by g-loads, laboratory animals (rats) were rotated on a centrifuge following a special procedure. Systematic g-loads along the craniocaudal axis resulted in reactive alterations, and also obvious destructive processes in the spinal gray matter (SGM). Light optical microscopy discovered that part of neurons had bodies with less intensive dying. Electron microscopy showed that among the cytoplasmic structures mitochondria were particularly sensitive to g-loads, which could affect mitochondrial oxidation. In the lumbar, these changes were observed in every segment under study; they were more significant in comparison with those found in cervical and thoracic segments of the spinal cord. Interneuron disintegration at neural centers revealed itself by the "light" type degeneration of synapses. Changes in capillaries included nuclei deformations and destruction of organelles in endotheliocytes, pericapillary edema, and erythrocytes sludge in the lumen. Inequality of spinal cord changes suggests the mosaic pattern of their distribution. Furthermore, their manifestation grew with the cranicaudal gradient so that the most conspicuous destructive developments occurred in the lumbar but not in the thoracic let alone the cervical segment. Acute g-loads gave rise to reactive changes in neurons and interneuron synapses that were the morphological markers of increased functional activity of neurons and activation of interneuron firing. In addition to the reactive changes, chronic g-loading also produced destructive disorders in GSM structures. These changes were not observed following acute g-loads and, therefore, resulted from multiple g-exposures and were cumulative.
[Mh] Termos MeSH primário: Gravidade Alterada/efeitos adversos
Substância Cinzenta/ultraestrutura
Medula Espinal
[Mh] Termos MeSH secundário: Animais
Modelos Animais de Doenças
Masculino
Microscopia Eletrônica
Ratos
[Pt] Tipo de publicação:ENGLISH ABSTRACT; JOURNAL ARTICLE
[Em] Mês de entrada:1509
[Cu] Atualização por classe:150821
[Lr] Data última revisão:
150821
[Sb] Subgrupo de revista:IM; S
[Da] Data de entrada para processamento:150822
[St] Status:MEDLINE


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PubMed Central Texto completo
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[PMID]:26208253
[Au] Autor:Wang P; Wang Z; Wang D; Tian Y; Li F; Zhang S; Zhang L; Guo Y; Liu W; Wang C; Chen S; Guo J
[Ad] Endereço:Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China.
[Ti] Título:Altered Gravity Simulated by Parabolic Flight and Water Immersion Leads to Decreased Trunk Motion.
[So] Source:PLoS One;10(7):e0133398, 2015.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Gravity is one of the important environmental factors that influence the physiologies and behaviors of animals and humans, and changes in gravity elicit a variety of physiological and behavioral alterations that include impaired movement coordination, vertigo, spatial disorientation, and perceptual illusions. To elucidate the effects of gravity on human physiology and behavior, we examined changes in wrist and trunk activities and heart rate during parabolic flight and the activity of wrist and trunk in water immersion experiments. Data from 195 person-time parabolas performed by eight subjects revealed that the trunk motion counts decreased by approximately half during ascending legs (hypergravity), relative to the data acquired before the parabolic flights. In contrast, the wrist activity remained unchanged. The results from the water immersion experiments demonstrated that in the underwater condition, both the wrist and trunk activities were significantly decreased but the latter decreased to a much lower level. Together, these data suggest that gravitational alterations can result in differential influences on the motions of the wrist and the trunk. These findings might be important for understanding the degeneration of skeleton and muscular system and performance of astronauts in microgravity.
[Mh] Termos MeSH primário: Gravidade Alterada
Movimento (Física)
Atividade Motora
[Mh] Termos MeSH secundário: Adulto
Frequência Cardíaca
Seres Humanos
Masculino
Punho
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1605
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150725
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0133398



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