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Residual force enhancement in human skeletal muscles:A systematic review and meta-analysis

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Journal of Sport and Health Science 2022年第1期11卷 94-103页

作者： Daiani de Campos Lucas B.R.Orssatto Gabriel S.Trajano Walter herzog Heiliane de Brito Fontana Biomechanics Laboratory Federal University of Santa CatarinaFlorianopolis 88040-001Brazil Faculty of Health School of Exercise and Nutrition SciencesQueensland University of TechnologyBrisbane QLD 4030Australia Human Performance Laboratory Faculty of KinesiologyUniversity of CalgaryAB T2N 1N4Canada School of Biological Sciences Federal University of Santa CatarinaFlorianopolis 88040-900Brazil

Objective:We reviewed and appraised the existing evidence of in vivo manifestations of residual force enhancement in human skeletal muscles and assessed,through a meta-analysis,the effect of an immediate history of eccentric contraction on the subsequent torque capacity of voluntary and electrically evoked muscle ***:Our search was conducted from database inception to May *** information was extracted from,and quality was assessed for,45 ***-analyses and metaregressions were used to analyze residual torque enhancement and its dependence on the angular amplitude of the preceding eccentric ***:Procedures varied across studies with regards to muscle group tested,angular stretch amplitude,randomization of contractions,time window analyzed,and verbal *** capacity in isometric(constant muscle tendon unit length and joint angle)contractions preceded by an eccentric contraction was typically greater compared to purely isometric contractions,and this effect was greater for electrically evoked muscle contractions than voluntary *** torque enhancement differed across muscle groups for the voluntary contractions,with a significant enhancement in torque observed for the adductor pollicis,ankle dorsiflexors,ankle plantar flexors,and knee extensors,but not for the elbow and knee ***-regressions revealed that the angular amplitude of the eccentric contraction(normalized to the respective joints full range of motion)was not associated with the residual torque enhancement ***:There is evidence of residual torque enhancement for most,but not all,muscle groups,and residual torque enhancement is greater for electrically evoked than for voluntary *** to our hypothesis,and contrary to generally accepted findings on isolated muscle preparations,residual torque enhancement in voluntary and electrically evoked contractions does not seem to depend on the angular ampli

关键词： Cross-bridge theory Eccentric contraction Force-length relationship Isometric force Muscle properties

Preservation of aberrant right hepatic arteries does not affect safety and oncological radicality of pancreaticoduodenectomy-own results and a systematic review of the literature

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Hepatobiliary Surgery and Nutrition 2022年第1期11卷 25-37页

作者： Cedrik Pyras Carsten Lukas Monika Janot-Matuschek Torsten herzog Andrea Tannapfel Waldemar Uhl Orlin Belyaev Department of Surgery St.Josef HospitalRuhr University BochumBochumGermany Institute of Radiology St.Josef HospitalRuhr University BochumBochumGermany Institute of Pathology Ruhr University BochumBochumGermany

Background:Aberrant right hepatic arteries(aRHA)are frequently encountered during pancreaticoduodenectomy(PD).Their effects on surgical morbidity and resection margin are still *** study aimed to compare the short term and long term outcomes in patients with and without ***:A single-center retrospective analysis of 353 consecutive PD during a 5-year period was *** type of arterial supply was determined preoperatively by CT and confirmed at *** types III-VI included some type of aRHA and comprised the study *** types I and II were considered irrelevant for PD and used as *** endpoints were the rates of major postoperative complications and the rate of R0-resection in cases of malignant *** endpoints included duration of surgery,postoperative stay,number of harvested lymph nodes and survival in patients with pancreatic *** results were compared to existent data using a systematic review of the ***:No aRHA had to be sacrificed or *** morbidity and specific complications such as post-pancreatectomy hemorrhage(PPH),pancreatic fistula and bile leak were the same in patients with and without *** was no significant difference in operative time,blood loss,length of ICU-and hospital *** with malignancy had similar high rates of R0-resection and identical number of harvested lymph *** of patients with pancreatic cancer was not affected by ***:aRHA may be preserved in virtually all cases of PD for resectable pancreatic head lesions without increasing surgical morbidity and without compromising oncological radicality in patients with cancer,provided the variant anatomy is being recognised on preoperative CT and a meticulous surgical technique is used.

关键词： Replaced hepatic artery accessory hepatic artery pancreatic cancer pancreatic surgery resection margin complications vascular anomalies

Running slow or running fast;that is the question:The merits of high-intensity interval training

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Journal of Sport and Health Science 2017年第1期6卷 48-48页

作者： Walter herzog Human Performance Laboratory Faculty of KinesiologyUniversity of CalgaryCalgaryAB T2N 1N4Canada

In a recent issue of the Journal of Sport and Health Science,García-Pinillos et al.~1 reviewed evidence on the effects of highintensity intermittent training(interval training)(HIIT)on muscular and performance adapta... 详细信息

关键词： that is the question:The merits of high-intensity interval training high Running slow or running fast

Fairness in Olympic sports:How can we control the increasing complexity of doping use in high performance sports?

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Journal of Sport and Health Science 2017年第1期6卷 47-页

作者： Walter herzog Human Performance Laboratory Faculty of KinesiologyUniversity of CalgaryAB T2N 1N4Canada

With the Rio Olympics just a few months past,we remember the excitement,the incredible performances,and the *** happens so often,the Olympic Games focus attention not only on athletic achievements but also on how athl... 详细信息

关键词： Fairness in Olympic sports How can we control the increasing complexity of doping use in high performance sports high

Does sturgeon do use electrosense in predating?

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Does sturgeon do use electrosense in predating?

Sport and health are global issues

中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： Hendrik herzog Institute of zoology University of BonnPoppelsdorfer SchlossBonn 53115Germany

＜正＞Objective The electro-receptive lateral line system appears in the early evolutionary history of *** of the primitive Chondrostei fish group,sturgeon,is well known to have the electroreceptors（the ampullay Lourenzeni organs） on the *** were thought to be sensitive to weak electric fields in aquatic environment and being used in behaviors of prey detecting,mating,and migrating;however,there was little experimental evidence could find directly to support the *** Here we report our results of behavioral and electrophysiological experiments that are specifically designed to investigate the function and characters of the electrosensory in ***,we record the electronic characters of the bio-electrical field of their living ***,we investigate the behavioral pattern of the Siberian Sturgeon,Acipenser baerii in response to the identified bio-electrical field（produced by embedding the living prey fish in the gel chamber）.Third,we record the response properties of the electrosensory neurons in the hind brain from the dorsal octavolateralis nucleus（DON） of the White Sturgeon,Acipenser transmontanus with the simulating sinusoidal electric field according to the identified characters of the bio-electrical field produced by living prey. Results（1） The bio-electrical field of prey fish presented as direct current electric field of dipole type with negative potential on head and positive potential on tail and modulated into alternating electric field by respiration rhythm;（2） During the stimulation,DON units increased their firing rate and phase coupled the stimulation wave and showed the selectivity of dipolar *** These behavioral and electrophysiological results are first solid evidence to point out that the electrosense of Sturgeon does being used in predating（feeding） behavior.

关键词： electrosense sturgeon behavior dipole hindbrain

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Journal of Sport and Health Science 2012年第1期1卷 4-4页

作者： Walter herzog Human Performance Laboratory Faculty of KinesiologyUniversity of Calgary

One of the mandates I tried to embrace when I was president of the International Society of Biomechanics(2007-2009) was to foster,encourage,and bring to the limelight,the research activities from countries that were underrepresented internationally.I realized that such underrepresentation was often the result of barriers between scientific communities that had evolved historically,based on background,language, scientific method,financial support etc.,barriers that could easily be overcome by personal contacts,acknowledgement

关键词： encourage contacts overcome foster barriers evolve

Impact of age on host responses to diet-induced obesity:Development of joint damage and metabolic set points

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Journal of Sport and Health Science 2020年第2期9卷 132-139页

作者： Kelsey H.Collins Graham Z.MacDonald David A.Hart Ruth A.Seerattan Jaqueline L.Rios Raylene A.Reimer Walter herzog Human Performance Laboratory University of CalgaryCalgaryAB T2N IN 4Canada McCaig Institute for Bone and Joint Health University of CalgaryAB T2N1N4Canada Department of Orthopaedic Surgery Washington UniversitySt.LouisMO 63108USA Bone&Joint Health Strategic Clinical Network Alberta Health ServicesEdmontonAB T5E 4E3Canada Department of Biochemistry and Molecular Biology Cumming School of MedicineUniversity of CalgaryAB T2N IN4Canada

Background:Osteoarthritis is one of the leading causes of pain and disability worldwide,and a large percentage of patients with osteoarthritis are individuals who are also *** recent years,a series of animal models have demonstrated that obesity-inducing diets can result in synovial joint damage(both with and without the superimposition of trauma),which may be related to changes in percentage of body fat and a series of low-level systemic inflammatory *** note,there is a disparity between whether the dietary challenges commence at weaning,representing a weanling onset,or at skeletal maturity,representing an adult onset of *** wished to evaluate the effect ofthe dietary exposure time and the age at which animals are exposed to a high-fat and high-sucrose(HFS) diet to determine whether these factors may result in disparate outcomes,as there is evidence suggesting that these factors result in differential metabolic *** on dietary exposure time,we hypothesized that rats fed an HFS diet for 14 weeks from weaning(HFS Weanling) would demonstrate an increase in knee joint damage scores,whereas rats exposed to the HFS diet for 4 weeks,starting at 12 weeks of age(HFS Adult) and rats exposed to a standard chow diet(Chow)would not display an increase in knee joint damage ***:Male Sprague-Dawley rats were fed either an HFS diet for 14 weeks from weaning(HFS Weanling) or an HFS diet for 4 weeks,starting at 12 weeks of age(HFS Adult).At sacrifice,joints were scored using the modified Mankin Criteria,and serum was analyzed for a defined subset of inflammatory markers(Interleukin-6,leptin,monocyte chemoattractant protein-1,and tumor necrosis factorα).Results:When the HFS Weanling and HFS Adult groups were compared,both groups had a similar percent of body fat,although the HFS Weanling group had a significantly greater body mass than the HFS Adult *** HFS Weanling and HFS Adult animals had a significant increase in body mass and pe

关键词： Adult exposure High-fat high-sucrose diet Rat obesity model Serum biomarkers Weanling exposure

Acknowledgment to reviewers—October 2020 to October 2021

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Journal of Sport and Health Science 2021年第6期10卷 697-699页

作者： Peijie Chen Walter herzog Jian Wu

Dear Readers and Supporters of Journal of Sport and Health Science(JSHS),The Editors of the JSHS would like to thank all the authors who have contributed to the JSHS over the past *** your support,JSHS has become an internationally recognized journal in the *** are also deeply indebted to the following people who served as reviewers and gave their time and expertise to carefully and constructively assess papers and facilitate the smooth running of JSHS in the past year.

关键词： journal reviewers thank

TBCs for Gas Turbines under Thermomechanical Loadings： Failure Behaviour and Life Prediction

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Journal of Energy and Power Engineering 2013年第4期7卷 647-653页

作者： Tilmann Beck Olena Trunova Roland herzog Lorenz Singheiser Forschungszentrum Juelich GmbH Institute of Energy and Climate Research Juelich 52425 Germany RM-Material Technology MAN Diesel & Turbo SE Oberhausen 46145 Germany

The present contribution gives an overview about recent research on a TBC （thermal barrier coating） system consisted of （I） an intermetallic MCrAIY-alloy BC （bond coat） applied by VPS （vacuum plasma spraying） and （2） an YSZ （yttria stabilised zirconia） top coat APS （air plasma sprayed） at Forschungszentrum Juelich, Institute of Energy and Climate Research （IEK-2）. The influence of high temperature dwell time, maximum and minimum temperature on crack growth kinetics during thermal cycling of such plasma sprayed TBCs is investigated using scanning electron microscopy and AE （acoustic emission） analysis. Thermocyclic life in terms of accumulated time at maximum temperature decreases with increasing high temperature dwell time and increases with increasing minimum temperature. AE analysis proves that crack growth mainly occurs during cooling at temperatures below the ductile-to-brittle transition temperature of the BC. Superimposed mechanical load cycles accelerate delamination crack growth and, in case of sufficiently high mechanical loadings, result in premature fatigue failure of the substrate. A life prediction model based on TGO growth kinetics and a fracture mechanics approach has been developed which accounts for the influence of maximum and minimum temperature as well as of high temperature dwell time with good accuracy in an extremely wide parameter range.

关键词： Thermal barrier coating spallation failure crack propagation thermomechanical fatigue lifetime prediction.