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Application of the neuromuscular fatigue threshold treadmill test to muscles of the quadriceps and hamstrings

Journal of Sport and Health Science 2020年第6期9卷 628-633页

作者： clayton L.camic Attila J.Kovacs Trisha A.VanDusseldorp ethan c.hill Evan A.Enquist Human Performance Laboratory Exercise and Sport ScienceUniversity of Wisconsin-La CrosseLa CrosseWisconsin 54601USA Department of Exercise Science and Sport Management Kennesaw State UniversityKennesawGeorgia 30144USA Department of Nutrition and Health Sciences University of Nebraska-LincolnLincolnNebraska 68583USA Department of Kinesiology University of AlabamaTuscaloosaAlabama 35487USA

Purpose:The purposes of the present study were:(1)to determine whether the physical working capacity at the fatigue threshold(PWcFT)model that has been used for estimating the onset of neuromuscular fatigue in the vastus lateralis(VL)during incremental treadmill running could also be applied to the vastus medialis(VM),biceps femoris(BF),and semitendinosus(ST)muscles;and(2)if applicable,to compare the running velocities associated with the PWcFT among these ***:Eleven subjects(age 21.7±1.8 years)performed an incremental treadmill test to exhaustion with electromyographic signals recorded from the VL,VM,BF,and ***:The results indicated there were no significant(p>0.05)mean differences in the running velocities associated with the PWcFT for the VL(14.4±2.0 km/h),VM(14.3±1.9 km/h),BF(13.8±1.8 km/h),and ST(14.7±2.3 km/h).In addition,there were significant inter-correlations(r=0.68-0.88)among running velocities associated with the PWcFT of each *** results also indicated that 9 of the 11 subjects exhibited identical PWcFT values for at least 3 of the 4 muscles,but there were no uniform patterns for any intra-individual ***:The findings of the present study suggested that the PWcFT test is a viable method to identify neuromuscular fatigue in the quadriceps and hamstrings during incremental treadmill exercise and results in consistent PWcFT values among these muscles.

关键词： EMG amplitude Muscle activation PWcFT

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Journal of Science in Sport and Exercise 2020年第2期2卷 173-182页

作者： Joshua L.Keller Terry J.Housh ethan c.hill cory M.Smith Richard J.Schmidt Glen O.Johnson Human Performance Laboratory Department of Nutrition and Health SciencesCollege of Education and Human SciencesUniversity of Nebraska-LincolnLincolnNE 68508USA Division of Kinesiology School of Kinesiology and Physical TherapyUniversity of Central FloridaOrlandoFL 32816USA Department of Kinesiology College of Health SciencesUniversity of Texas at El PasoEl PasoTX 79968USA

The purpose of this investigation was to use the RPE clamp protocol to examine sex-related differences in performance fati-gability and neuromuscular responses as the result of a sustained isometric leg extension muscle action anchored to RPE=*** adults(10 men,10 women)performed sustained muscle actions at RPE=2 for *** voluntary isometric contractions(MVIc)were performed prior to and following the sustained muscle ***(electromyographic and mechanomyographic)parameters and force were recorded,and the values were normalized to respective MVIcs and cal-culated every 5%across the 5-min work *** artery blood flow(FABF)was assessed at pretest,immediately posttest,and 5-min *** regression was used to define the individual and composite normalized neuromuscular and force versus time relationships during the sustained muscle *** factorial ANOVAs were used to examine differences in performance fatigability and blood *** performance fatigability,the men(62.4±14.4 kg-43.1±11.5 kg)exhibited a significantly(Pcrease pretest to posttest in MVIc than the women(44.1±4.8 kg vs.38.1±6.1 kg).There were different fatigue-induced neuromuscular patterns of responses between the men and women across *** blood flow responses,however,there was no sex-related difference,but pretest(283.3±70.8 mL/min)was significantly(Pce fatigability than the women,which was independent of differences in *** such as the neuromuscular system and muscle morphology likely contributed to the difference in performance fatigability.

关键词： Perception Resistance training Electromyography Fatigue Mechanomyography RPE clamp

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

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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

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Learning from the 2009 H1N1 pandemic:prospects for more broadly effective influenza vaccines

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Journal of Molecular cell Biology 2011年第3期3卷 144-146页

作者： ethan c.Settembre Philip R.Dormitzer Rino Rappuoli Novartis Vaccines and Diagnostics CambridgeMAUSASienaItaly

calls to develop a universal influenza vaccine have increased in the wake of the 2009 H1N1 influenza *** demand comes at a time when analyses of the human antibody repertoire,informed by structures of complexes between broadly neutralizing antibodies and influenza hemagglutinin,have revealed the target of a class of broadly neutralizing *** studies suggest a path forward to more broadly protective influenza vaccines.

关键词： influenza vaccines protective

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HIDA scan for functional gallbladder disorder： ensure that you know how the scan was done

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Hepatobiliary & Pancreatic Diseases International 2017年第2期16卷 197-201页

作者： Naeem Goussous Hadia Maqsood ethan Spiegler Gopal c Kowdley Steven c cunningham Department of Surgery Saint Agnes Hospital Baltimore USA Department of Nuclear Medicine Saint Agnes Hospital Baltimore USA

BAcKGROUND： Despite the increasing use of fatty meal（FM） as a substitute for cholecystokinin（ccK） in pain reproduction during hepato-imino-diacetic acid（HIDA） scan in functional gallbladder disorder, there are no studies comparing the differences between ccK and FM. The present study was to compare the efficacy of FM in comparison of ccK in FGBD application. METHODS： Patients undergoing HIDA scans from August 2013 to May 2014 were divided into two groups： those undergoing ccK-stimulated HIDA scan versus FM-stimulated HIDA scan. These groups were compared according to demographics and HIDA ***： Of 153 patients, 70 received ccK and 83 FM. There was no difference regarding age, gender, gallstones, gallbladder ejection fraction and time to visualization. However, significantly more of the patients receiving ccK than FM experienced pain reproduction（61% vs 30%, P〈0.01）.cONcLUSIONS： Stimulation of gallbladder contractility with a FM during HIDA is less than half as likely to reproduce biliary symptoms compared to ccK, despite similar ejection fractions and other parameters. It is essential that providers account for this difference when counseling patients regarding cholecystectomy for functional gallbladder disorder.

关键词： gallbladder dysfunction biliary dyskinesia cholecystokinin hepato-imino-diacetic acid

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测定稀乳状液稳定性的cIPAc法的改进——浊度测定法的研究

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农药译丛 1990年第1期12卷 40-48页

作者： Alistair c.hill 纪文英国壳牌研究公司Sittingbourne研究中心

现行的 cIPAO“其他方法”中的 MT36.1和 MT36.2是评定稀乳状液体相稳定性(bulkstability)的最好方法。这些方法已得到国际农药工业界的公认。cIPAO MT36.1是著名的“5%”乳状液试验方法。它是根据肉眼观察乳油以1:20稀释比例稀释30分钟... 详细信息

现行的 cIPAO“其他方法”中的 MT36.1和 MT36.2是评定稀乳状液体相稳定性(bulkstability)的最好方法。这些方法已得到国际农药工业界的公认。cIPAO MT36.1是著名的“5%”乳状液试验方法。它是根据肉眼观察乳油以1:20稀释比例稀释30分钟、2小时和24小时后的油或乳油分离情况来评定乳状液稳定性的。在该试验中,一般认为,田间使用浓度在50毫升/升以下的乳油商品用任何试验水稀释后,放置2小时,分出的油状物低于3毫升者是良好的。

关键词：稀乳状液稳定性农药 cIPAc法测定浊度测定法

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Lesion-symptom mapping with NIHSS sub-scores in ischemic stroke patients

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Stroke & Vascular Neurology 2022年第2期7卷 124-131页

作者： Deepthi Rajashekar Matthias Wilms M ethan MacDonald Serena Schimert Michael D hill Andrew Demchuk Mayank Goyal Sean P Dukelow Nils Daniel Forkert Biomedical Engineering Graduate Program Hotchkiss Brain InstituteUniversity of CalgaryCalgaryAlbertaCanada Department of Radiology Cumming School of MedicineUniversity of CalgaryCalgaryAlbertaCanada Hotchkiss Brain Institute University of CalgaryCalgaryAlbertaCanada Department of clinical Neurosciences University of CalgaryCalgaryAlbertaCanada Department of Electrical and computer Engineering University of CalgaryCalgaryAlbertaCanada Department of community Health Sciences Cumming School of MedicineUniversity of CalgaryCalgaryAlbertaCanada Department of Medicine Cumming School of MedicineUniversity of CalgaryCalgaryAlbertaCanada Alberta children's Hospital Research Institute University of CalgaryCalgaryABCanada

Background Lesion-symptom mapping(LSM)is a statistical technique to investigate the population-specific relationship between structural integrity and post-stroke clinical *** clinical practice,patients are commonly evaluated using the National Institutes of Health Stroke Scale(NIHSS),an 11-domain clinical score to quantitate neurological deficits due to *** far,LSM studies have mostly used the total NIHSS score for analysis,which might not uncover subtle structure–function relationships associated with the specific sub-domains of the NIHSS ***,the aim of this work was to investigate the feasibility to perform LSM analyses with sub-score information to reveal category-specific structure–function relationships that a total score may not *** Employing a multivariate technique,LSM analyses were conducted using a sample of 180 patients with NIHSS assessment at 48-hour post-stroke from the EScAPE *** NIHSS domains were grouped into six categories using two *** was conducted for each category of the two groupings and the total NIHSS *** Sub-score LSMs not only identify most of the brain regions that are identified as critical by the total NIHSS score but also reveal additional brain regions critical to each function category of the NIHSS assessment without requiring extensive,specialised *** These findings show that widely available sub-scores of clinical outcome assessments can be used to investigate more specific structure–function relationships,which may improve predictive modelling of stroke outcomes in the context of modern clinical stroke assessments and neuroimaging.

关键词： patients score category

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Retrospective analysis of eFAST ultrasounds performed on trauma activations at an academic level-1 trauma center

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World Journal of Emergency Medicine 2020年第1期11卷 12-17页

作者： Samantha Shwe Lauren Witchey Shadi Lahham ethan Kunstadt Inna Shniter John c.Fox School of Medicine University of CaliforniaIrvine 92697USA Department of Emergency Medicine University of CaliforniaIrvineOrangeCA 92868USA

BAcKGROUND:Point-of-care ultrasound(POcUS)has become increasingly integrated into the practice of emergency medicine.A common application is the extended focused assessment with sonography in trauma(eFAST)*** American college of Emergency Physicians has guidelines regarding the scope of ultrasound in the emergency department and the appropriate *** objective of this study was to conduct a review of performed,documented and billed eFAST ultrasounds on trauma activation ***:This was a retrospective review of all trauma activation patients during a 10-month period at an academic level-one trauma center.A list comparing all trauma activations was crossreferenced with a list of all billed eFAST *** records were reviewed to determine whether an eFAST was indicated,performed,and appropriately ***:We found that 1,507 of 1,597 trauma patients had indications for eFAST,but 396(27%)of these patients did not have a billed *** these 396 patients,87(22%)had documentation in the provider note that an eFAST was performed but there was no separate procedure *** remaining 309(78%)did not have any documentation of the eFAST in the patient’s chart although an eFAST was recorded and reviewed during ultrasound quality ***:A significant proportion of trauma patients had eFAST exams performed but were not documented or *** of documentation was *** ultrasound programs require appropriate reimbursement to support training,credentialing,equipment,quality assurance,and device *** study demonstrates a significant absence of adequate documentation leading to potential revenue loss for an emergency ultrasound program.

关键词： Point-of-care ultrasound Emergency medicine Focused assessment withsonography in trauma Trauma activation Blunt trauma

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改进的测定稀乳状液稳定性的cIPAc法——比色法

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农药译丛 1990年第1期12卷 49-52页

作者： Alistair c.hill 程华英国壳牌研究公司Sittingbourne研究中心

cIPAc MT36.2是测定稀乳状液体相稳定性的一种方法,该法采用下列方程式计算:分散稳定性=100(2x-y)/x式中2x 为初始200毫升分散液的有效成份的含量;y 为量筒中剩下的稀乳状液(100毫升)中有效成份的含量。

关键词： cIPAc法比色法农药稀乳状液体稳定性测定

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1640年英国革命

1640年英国革命

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1958年

作者：（英）希尔（c.hill）舒贻上译

来源：汇雅图书（南通市图书馆... 评论

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