检索结果-南通市图书馆

Day to Day Consistency and Inter-subject variability of Neuromuscular Responses and Performance Fatigability as the Result of Maximal,Bilateral,Dynamic Leg Extensions

引用

Journal of Science in Sport and Exercise 2021年第2期3卷 195-204页

作者： Joshua L.Keller Terry J.Housh john paul v.anders Cory M.Smith Ethan C.Hill Richard J.Schmidt Glen O.johnson Exercise Physiology Laboratory University of Nebraska-Lincoln1740 Vine StreetLincolnNE 68508USA Department of Kinesiology Human and Environmental Physiology LaboratoryUniversity of Texas At El PasoEl PasoTX 79968USA School of Kinesiology and Physical Therapy Division of KinesiologyUniversity of Central FloridaOrlandoFL 32816USA

Purpose The purpose of the present study was to examine the day-to-day consistency and inter-subject variability of com-posite and individual,neuromuscular and torque patterns of responses as a result of a fatiguing bout of maximal,bilateral,isokinetic leg extension muscle *** Ten men (Mean ± SD =21.6 ± 2.5 years) completed two testing visits consisting of pretest and posttest maximal voluntary isometric contractions (MvIC) as well as 25 maximal,bilateral,isokinetic (180°/s),leg extension muscle *** (EMG) and mechanomyographic (MMG) signals were collected from the vastus lateralis and normalized to the *** fatigability was defined as the percent decline in torque between the average of repetitions 1,2,and 3 and repetitions 23,24,and *** regression was used to examine the individual and composite relation-ships between EMG amplitude (AMP),EMG mean power frequency (MPF),MMG AMP,MMG MPF,and torque versus *** There was no significant difference (d =0.80;P =0.17) in the performance fatigability between Day 1 (19.3% ± 7.1%)and Day 2 (26.9% ± 11.3%).Polynomial regression indicated substantial inter-subject variability,but high day-to-day *** The composite EMG AMP,MMG AMP,and MMG MPF patterns of responses demonstrated consistency across *** composite EMG MPF patterns of responses,however,were not consistent between Day 1 and Day *** addition,based on the high inter-subject variability,future studies should present both composite patterns of neuromuscular responses and the patterns of responses on a subject-by-subject basis to make inferences regarding fatigue-induced changes in motor unit activation strategies.

关键词： Performance fatigability Electromyography Mechanomyography Bilateral Dynamic

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Coactivation Does Not Contribute to Fatigue-Induced Decreases in Isokinetic Forearm Flexion and Extension Torque

引用

Journal of Science in Sport and Exercise 2023年第4期5卷 314-321页

作者： Tyler J.Neltner john paul v.anders Robert W.Smith Jocelyn E.Arnett Joshua L.Keller Terry J.Housh Richard J.Schmidt Glen O.johnson Department of Nutrition and Health Sciences University of Nebraska-LincolnLincolnNE 68510USA Integrative Laboratory of Exercise and Applied Physiology(iLEAP) Department of HealthKinesiology and SportUniversity of South AlabamaMobileAL 36688USA

Purpose The present study examined the effects of a reciprocal,slow velocity forearm flexion and extension task on fatigue-induced changes in isokinetic torque,agonist and antagonist muscle activation,and coactivation ratios at slow and moderate *** Nine women(mean±SD:age=21.0±1.7 years;body mass=68.1±8.2 kg;height=167.4±7.2 cm)completed pre-testing for forearm flexion and extension isokinetic peak torque at 60 and 180°/s,a fatiguing task of 50 maximal,recip-rocal,isokinetic muscle actions at 60°/s,and *** amplitude(AMP)of the electromyographic(EMG)signals from the biceps and triceps were simultaneously *** and EMG AMP were normalized to the corresponding values from the pre-testing peak torque *** measures ANOvAs and pairwise comparisons were used to identify mean changes in torque,EMG AMP,and coactivation *** The torque analyses indicated significant decreases from pre-to post-testing for forearm flexion(14.1%±5.0%;Pvements(24.7%±11.7%;Pvation ratios,there were no changes(P>0.05)from pre-to post-testing for either velocity or *** The torque responses were velocity-specific,with greater fatigability exhibited for forearm extension versus flexion at 60°/s,but no differences at 180°/*** parallel EMG AMP responses between the agonist and antagonist muscles for both velocities supported the lack of fatigue-induced changes in coactivation ***,our results demonstrated that fatigue-induced decreases in torque were not attributable to increases in antagonist activation or coactivation.

关键词： Coactivation Isokinetic Fatigue Forearm flexion Extension

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

DETERMINANTS OF STRUCTURE IN AQUATIC NON-PELAGIC PROTOZOAN COMMUNITIES

引用

Chinese Journal of Oceanology and Limnology 1993年第3期11卷 215-228页

作者： john Cairns Jr paul v.McCormick University Center for Environmental and Hazardous Materials Studies Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 U.S.AUniversity Center for Environmental and Hazardous Materials Studies Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 U.S.AUniversity Center for Environmental and Hazardous Materials Studies Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 U.S.A

Although microbes have traditionally been used as models for testing ecological theory, research on the organization of these communities has largely been isolated from other areas of community ecology. Early studies indicated that microbial populations can form dynamic, interacting assemblages. Observations of distributional patterns suggest that certain deterministic forces regulate community structure. It appears that protozoans are tolerant of a wide range of environmental conditions although evidence for this is largely based on gross environmental analyses. Laboratory studies have suggested the importance of negative and positive biotic interactions in determining community membership, but little field evidence for this exists. The importance of transport processes in controlling community composition is being increasingly recognized. All three types of processes likely act to regulate the colonization and successional dynamics of these communities. A simple model is presented to promote the

关键词： determinants structure protozoan communities

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Hyponatremia in cirrhosis:Pathophysiology and management

引用

World Journal of Gastroenterology 2015年第11期21卷 3197-3205页

作者： Savio john paul J Thuluvath Division of Gastroenterology Department of MedicineSUNY Upstate Medical University University of Maryland School of Medicine and Mercy Medical Center

Hyponatremia is frequently seen in patients with ascites secondary to advanced cirrhosis and portal *** development of ascites in patients with cirrhosis is *** hypertension and the associated systemic vasodilation lead to activation of the sodium-retaining neurohumoral mechanisms which include the renin-angiotensin-aldosterone system,sympathetic nervous system and antidiuretic hormone(ADH).The net effect is the avid retention of sodium and water to compensate for the low effective circulatory volume resulting in the development of *** not apparent in the early stages of cirrhosis,the progression of cirrhosis and ascites leads to impairment of the kidneys to eliminate solutefree *** leads to additional compensatory mechanisms including non-osmotic secretion of ADH,also known as arginine vasopressin,further worsening excess water retention and thereby *** is associated with increased morbidity and mortality in patients with cirrhosis,and is an important prognostic marker both before and after liver *** management of hyponatremia in this setting is a challenge as conventional therapy for hyponatremia including fluid restriction and loop diuretics are frequently *** this review,we discuss the pathophysiology and various treatment modalities,including selective vasopressin receptor antagonists,for the management of hyponatremia in patients with cirrhosis.

关键词： Hyponatremia in cirrhosis Dilutional hypo-natremia

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

An Updated Review on Low-Temperature Nanocomposites with a Special Focus on Thermal Management in Buildings

引用

Energy Engineering 2022年第4期119卷 1299-1325页

作者： john paul K.Kadirgama M.Samykano R.Saidur A.K.Pandey R.v.Mohan Faculty of Mechanical&Automotive Engineering Technology Universiti Malaysia PahangPekan26600Malaysia College of Engineering Universiti Malaysia PahangPekan26600Malaysia Research Centre for Nanomaterials and Energy Technology School of Engineering and TechnologySunway UniversityPetaling Jaya47500Malaysia Joint School of Nanoscience&Nanoengineering North Carolina A&T State UniversityNorth CarolinaGreensboro27401USA

Buildings contribute to 33%of total global energy consumption,which corresponds to 38%of greenhouse gas *** building’s energy efficiency remains predominant in mitigating global ***-ments in thermal energy storage(TES)techniques using phase change material(PCM)have gained much attention among researchers,primarily to minimize energy consumption and to promote the use of renewable energy *** technology stays as the most promising technology for developing high-performance and energy-efficient *** major drawback of PCM is its poor thermal conductivity which limits its potential use which could be resolved by dispersing conductive *** acquired database on synthesis routes,properties,and performance of nano-dispersed phase change materials(NDPCMs)with various techniques presented in the paper should deliver useful information in the production of NDPCMs with desirable characteristics mainly for building construction *** outline of contemporary developments and use of NDPCMs as TES medium is ***,a brief discussion on challenges and the outlook was also ***-depth research is needed to explore the fundamental mechanisms behind the enhanced thermal conductivity of NDPCM with nanofillers dispersion and also a thorough investigation on how these mechanisms drive improvement in building performance.

关键词： Thermal conductivity latent heat building applications energy savings

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Prospects for the continued development of environmentally-realistic toxicity test susing microorganisms

引用

Journal of Environmental Sciences 1993年第3期5卷 253-268页

作者： john Cairns,Jr. paul v.McCormick Scott E.Belanger Department of Biology and University Center for Environmental and Hazardous Materials Studies Virginia Polytechnic Institute and State UniversityBlacksburgVirginia 24061-0415U.S.A. Department of Biology Elizabethtown CollegeElizabethtownPennsylvania-17022-2298U.S.A.and Senior Research AssociateUniversity Center for Environmental and Hazardous Materials StudiesVirginia Polytechnic Institute and State UniversityBlacksburgVirginia-24061-0415U.S.A. Stream Ecosystem Research Section Environmental Safety DepartmentThe Procter and Gamble CompanyCincinnatiOhio-45217U.S.A.

The focus of environmental regulations has changed significantly since the introduction of the bioassay as a standard means of assessing environmental *** in this change is an increasing emphasis on protecting the integrity of natural ecosystems,which incorporate community-and system-level properties as well as organismal and population ***,support for the use of multispecies testing has widened to include not only ecologists in academia but environmental scientists in the regulatory and industrial sector as *** reason for this trend is clear:the additional environmental realism gained from tests utilizing communities of organisms allows for greater insight into the potential hazard of chemicals and other forms of human activity to natural ecosystems that cannot be obtained from single species tests *** of the problems cited for multispecies testing early in their evolution as a hazard assessment tool have been refuted or *** particular,the use of natural microbial communities minimizes several shortcomings typically associated with multispecies toxicity *** discussion includes the utility of microcosm and mesocosm tests using aquatic microbial communities as hazard assessment tools in conjunction with accumulating information on their performance in toxicity testing *** increasing body of experimental evidence supports an expansion in the use of these tests for a variety of regulatory and research purposes.A shift in research focus is needed,however,to answer remaining questions and further refine standard protocols for these valuable ecotoxicological tools.

关键词： environmentally-realistic toxicity tests microorganisms.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Determining the role for uric acid in non-alcoholic steatohepatitis development and the utility of urate metabolites in diagnosis:An opinion review

引用

World Journal of Gastroenterology 2020年第15期26卷 1683-1690页

作者： paul Brennan Kathleen Clare Jacob George john F Dillon Department of Molecular and Clinical Medicine University of DundeeNinewells Hospital and Medical SchoolDundee DD19SYUnited Kingdom Department of Neurology Queen Elizabeth HospitalGlasgow G514TFUnited Kingdom

There has long been a recognised association between non-alcoholic fatty liver disease(NAFLD)and the composite aspects of the metabolic *** of this association highlighted the supposed co-existence of elevated uric acid levels in those with *** is interest in exploitation of this as a putative diagnostic and prognostic biomarker in *** the increased economic and health burden associated with the NAFLD epidemic,improved methods of population-based,minimally-invasive methods and biomarkers are clearly highly sought and *** this opinion review we review the proposed role of uric acid in the pathogenesis of NAFLD and its potential utilisation in the diagnosis and monitoring of the disease process.

关键词： Non-alcoholic fatty liver disease Non-alcoholic steatohepatitis Uric acid Urate Non-invasive fibrosis markers Fatty liver index

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Irritable bowel syndrome: A microbiome-gut-brain axis disorder?

引用

World Journal of Gastroenterology 2014年第39期20卷 14105-14125页

作者： paul J Kennedy john F Cryan Timothy G Dinan Gerard Clarke 1.15 Biosciences Institute Department of Psychiatry Alimentary Pharmabiotic Centre University College Cork Cork Ireland Department of Anatomy and Neuroscience Alimentary Pharmabiotic CentreUniversity College CorkCork Ireland

Irritable bowel syndrome(IBS) is an extremely prevalent but poorly understood gastrointestinal disorder. Consequently, there are no clear diagnostic markers to help diagnose the disorder and treatment options are limited to management of the symptoms. The concept of a dysregulated gut-brain axis has been adopted as a suitable model for the disorder. The gut microbiome may play an important role in the onset and exacerbation of symptoms in the disorder and has been extensively studied in this context. Although a causal role cannot yet be inferred from the clinical studies which have attempted to characterise the gut microbiota in IBS, they do confirm alterations in both community stability and diversity. Moreover, it has been reliably demonstrated that manipulation of the microbiota can influence the key symptoms, including abdominal pain and bowel habit, and other prominent features of IBS. A variety of strategies have been taken to study these interactions, including probiotics, antibiotics, faecal transplantations and the use of germ-free animals. There are clear mechanisms through which the microbiota can produce these effects, both humoral and neural. Taken together, these findings firmly establish the microbiota as a critical node in the gut-brain axis and one which is amenable to therapeutic interventions.

关键词： Irritable bowel syndrome Microbiome Anxiety Tryptophan Abdominal pain Gastrointestinal motility Cognition

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Impact of a national basic skills in colonoscopy course on trainee performance: An interrupted time series analysis

引用

World Journal of Gastroenterology 2020年第23期26卷 3283-3292页

作者： Keith Siau James Hodson john T anderson Roland valori Geoff Smith paul Hagan Marietta Iacucci paul Dunckley Joint Advisory Group on Gastrointestinal Endoscopy Royal College of PhysiciansLondon NW14LEUnited Kingdom NIHR Biomedical Research Centre University of BirminghamBirmingham B152TTUnited Kingdom Institute of Translational Medicine University Hospitals BirminghamBirmingham B152TTUnited Kingdom Department of Gastroenterology Gloucestershire Hospitals NHSFTCheltenham GL537ANUnited Kingdom Department of Gastroenterology Imperial College NHS Foundation TrustLondon NW14LEUnited Kingdom Endoscopy Department Derby Royal HospitalDerby GL13NNUnited Kingdom

BACKGROUND The Joint Advisory Group on Gastrointestinal Endoscopy basic skills in colonoscopy(BSC) course was introduced in 2009 to improve colonoscopy training within the United Kingdom, but its impact on trainee performance is *** To assess whether attendance of the BSC could improve colonoscopy *** Trainees awarded colonoscopy certification between 2011-2016 were stratified into 3 groups according to pre-course procedure count( 140).Study outcomes, comprising the unassisted caecal intubation rate(CIR) and the performance indicator of colonic intubation(PICI), were studied over the 50 procedures pre and post-course. Interrupted time series analyses were performed to detect step-change changes attributable to the *** A total of 369 trainees with pre-course procedure counts of 140(n = 130) were included. Over the 50 pre-course procedures,significant linear improvements in CIR were found, with average increases of 4.2,3.6 and 1.7 percentage points(pp) per 10 procedures performed in the 140 groups respectively(all P vement in CIR, increasing from 46% in the last pre-course procedure, to 51% in the first procedure post-course(P = 0.005). The CIR step-change was not significant in the 70-140(68% to 71%;P = 0.239) or > 140(86% to 87%;P = 0.354) groups. For PICI, significant step-change improvements were seen in all three groups, with average increases of 5.6 pp(P vement in PICI, regardless of prior procedural experience. However, CIR data suggest that the optimal timing of course attendance appears to be at earlier stages of training(< 70 procedures).

关键词： Colonoscopy Training Course Competency development Skills Endoscopy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Activated systemic inflammatory response at diagnosis reduces lymph node count in colonic carcinoma

引用

World Journal of Gastrointestinal Oncology 2016年第8期8卷 623-628页

作者： Rory P Kennelly Brenda Murphy john O Larkin Brian J Mehigan paul H McCormick Department of Colorectal Surgery St James Hospital

AIM: To investigate a link between lymph node yield and systemic inflammatory response in colon cancer. METHODS: A prospectively maintained database was interrogated. All patients undergoing curative colonic resection were included. Neutrophil lymphocyte ratio(NLR) and albumin were used as markers of SIR. In keeping with previously studies, NLR ≥ 4, albumin ve patients had NLR vs 19.2 ± 7.9(P = 0.036)]. More patients with an elevated NLR had node positive disease and an increased lymph node ratio(≥ 0.25, P = 0.044). CONCLUSION: Prognosis in colon cancer is intimately linked to the patient’s immune response. Assuming standardised surgical technique and sub specialty pathology, lymph node count is reduced when systemic inflammatory response is activated.

关键词： Systemic inflammatory response Lymph node yield Lymph node count Colon cancer Colonic cancer Neutrophil-lymphocyte ratio Neutrophil to lymphocyte ratio Lymph node ratio

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：