|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Why are muscles strong, and why do they require little energy in eccentric action?显示文摘It is well acknowledged that muscles that are elongated while activated(i.e.,eccentric muscle action)are stronger and require less energy(per unit of force)than muscles that are shortening(i.e.,concentric contraction)or that remain at a constant length(i.e.,isometric contraction).Although the cross-bridge theory of muscle contraction provides a good explanation for the increase in force in active muscle lengthening,it does not explain the residual increase in force following active lengthening(residual force enhancement),or except with additional assumptions,the reduced metabolic requirement of muscle during and following active stretch.Aside from the cross-bridge theory,2 other primary explanations for the mechanical properties of actively stretched muscles have emerged:(1)the so-called sarcomere length nonuniformity theory and(2)the engagement of a passive structural element theory.In this article,these theories are discussed,and it is shown that the last of these—the engagement of a passive structural element in eccentric muscle action—offers a simple and complete explanation for many hitherto unexplained observations in actively lengthening muscle.Although by no means fully proven,the theory has great appeal for its simplicity and beauty,and even if over time it is shown to be wrong,it nevertheless forms a useful framework for direct hypothesis testing. | Walter Herzog | 2018 | Journal of Sport and Health Science2018，7，3： | 2 |
| 2 | A comparison of lower limb stiffness and mechanical muscle function in ACL-reconstructed,elite,and adolescent alpine ski racers/ski cross athletes显示文摘Purpose: The aim of this study was to compare mechanical muscle function in the eccentric/concentric phases of vertical bilateral jumping in anterior cruciate ligament-reconstructed(ACLR), elite(ELITE), and adolescent(ADOL) alpine ski racers and ski cross athletes.Methods: Alpine ski racers/ski crossers(ACLR: n = 12, age = 26.7 § 3.8 years; ELITE: n = 12, age = 23.9 § 3.0 years; ADOL: n = 12, age = 17.8§ 0.7 years; females: n = 6 per group, males: n = 6 per group) performed 5 maximal countermovement jumps(CMJs) and 5 squat jumps. The ground reaction forces for each limb were analyzed using dual force plate recording to obtain body center of mass(BCM) velocity, displacement,and power. The eccentric deceleration(ECC) and concentric phases were determined from BCM velocity. CMJ net concentric and ECC impulses were calculated(body mass normalized) along with the peak and mean BCM power and maximal vertical jump height. CMJ lower limb stiffness(LLS) was determined by the slope of the ground reaction forces vs. the BCM displacement curve over the ECC phase. Concentric and ECC asymmetry indices were calculated for each leg, and the left vs. right LLS was compared. Outcome measures(reported as mean § SD) calculated as a 5-jump mean were normalized to body mass and compared using an analysis of variance.Results: No between-group differences were found for peak and mean power or jump heights. There were no group differences for LLS or net concentric phase impulse, but the net ECC impulse was lower in the ADOL group compared with ELITE skiers(ADOL: 1.33 § 0.32 Ns/kg;ELITE: 1.59 § 0.16 Ns/kg; p < 0.05). Although no group differences were found for ECC asymmetry indices, a group ￡ limb interaction was found for LLS(p < 0.01), which was systematically higher in the right vs. the left limb of ADOL skiers(right: 54.1 § 17.9 N/m/kg; left: 48.7 §15.7 N/m/kg; p < 0.01).Conclusion: ADOL skiers demonstrated decreased ECC impulse and systematic right limb dominance in LLS compared with ACLR and ELITE skiers. The implication of these findings for injury and performance are unknown, but further investigation into these potential relationships is warranted. | matthew j.jordan per aagaard walter herzog | 2018 | Journal of Sport and Health Science2018，7，4： | 2 |
| 3 | Do recreational team sports provide fitness and health benefits?显示文摘In many countries,sedentary lifestyle has led to a number of epidemic health problems,including obesity,metabolic syndrome,and associated comorbidities.Countries have performed self-evaluations of the fitness status of their people:children,young adults,and the elderly.Policies for increased school-based physical education,and financial | Walter Herzog | 2018 | Journal of Sport and Health Science2018，7，2： | 2 |
| 4 | Reflections on obesity,exercise,and musculoskeletal health显示文摘Obesity is a disease that has become an epidemic in economically developed countries,and manifests itself at increasing rates in economically developing countries.Obesity is associated with a variety of comorbidities,such as metabolic disease,diabetes,cardiovascular diseases,and musculoskeletal disorders,all resulting in tremendous costs to health care systems around the world,a reduced capacity for work,and reduced quality of life for people with obesity,coupled with physical inactivity,thereby producing a vicious circle of inactivity-induced diseases that enhances obesity. | Walter Herzog Guest Editor | 2020 | Journal of Sport and Health Science2020，9，2： | 1 |
| 5 | Effect of ecological compensation areas on floristic and breeding bird diversity in Swiss agricultural landscapes显示文摘 | F. Herzog S. Dreier G. Hofer C. Marfurt B. Schüpbach M. Spiess T. Walter | 2005 | Agriculture, Ecosystems and Environment2005，，3： | 1 |
| 6 | Model-based estimation of muscle forces exerted during movements显示文摘 | Ahmet Erdemir Scott McLean Walter Herzog | 2007 | Clinical Biomechanics2007，，22： | 1 |
| 7 | What is the series elastic component in skeletal muscle? 显示文摘 | WALTER HERZOG | 1997 | Appl Biom1997，，13： | 1 |
| 8 | Effect of Ecological Compensation Areas on Floristic and Breeding Bird Diversity in Swiss Agricultural Land- scapes 显示文摘 | Herzog F Dreier S Hofer G Marfurt C Schupbach B Spiess M Walter T | 2005 | Agriculture Ecosystems and Environment2005，108，03： | 1 |
| 9 | Effect of ecological compensation areas on floristic and breeding bird diversity in Swiss agricultural landscapes显示文摘 | F. Herzog S. Dreier G. Hofer C. Marfurt B. Schüpbach M. Spiess T. Walter | 2005 | Agriculture Ecosystems and Environment2005，，3： | 1 |
| 10 | Sport as a means of immi- grant youth integration: an empirical study of sports, intercul- tural relations, and immigrant youth integration in Switzerland 显示文摘 | Elena Makarova Walter Herzog | 2014 | Sportwiss2014，，44： | 1 |
| 11 | A novel model for dif- fusion based release kinetics using an inverse numerical method显示文摘 | Hadi Mohammadi Walter Herzog | 2011 | Medical Engineering & Physics2011，33，8： | 1 |
| 12 | Muscle and fascicle excursion in children with cerebral palsy显示文摘 | Sigrun Matthiasdottir Marlee Hahn Megan Yaraskavitch Walter Herzog | 2014 | Clinical Biomechanics2014，，： | 1 |
| 13 | 跑步损伤的相关问题(英文)显示文摘I entered my first running race(a 60-m sprint)when I was 6years old,and have run and competed ever since for the past 55years.When I was 19 years old,I entered the Physical Education program at the Federal Technical Institute in Zurich,where I became exposed to running and running injury research,and although I have never researched running myself,through | Walter Herzog | 2016 | Journal of Sport and Health Science2016，5，2： | 1 |
| 14 | Brand-Specific Leadership:Turning Employees into Brand Champions 显示文摘 | FELICITAS M MORHART WALTER HERZOG TORSTEN TOMCZAK | 2009 | Journal of Marketing2009，73，5： | 1 |
| 15 | Eccentric vs. concentric muscle contraction: That is the question显示文摘In their recent papers in the Journal of Sport and Health Science on hamstring injuries in sprinting,^(1,2)and their corresponding commentaries on each other's research,3,4Yu et al.and Liu et al.proposed different views of the mechanisms of muscle injuries in general,and hamstring injuries in sprinting specifically.While Yu et al.^(1,3)argued that muscle injuries are primarily,if not exclusively,caused by muscle strain magnitude in eccentric contractions,and thus hamstring injuries occur primarily | Walter Herzog | 2017 | Journal of Sport and Health Science2017，6，2： | 1 |
| 16 | Impact of age on host responses to diet-induced obesity:Development of joint damage and metabolic set points显示文摘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 obese.In 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 mediators.Of 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 obesity.We 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 disturbances.Based 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 scores.Methods: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 group.The HFS Weanling and HFS Adult animals had a significant increase in body mass and percentage of body fat when compared to the Chow group.Although knee joint damage scores were low in all 3 groups,we found,contrary to our hypothesis,that the HFS Adult group had statistically significant greater knee joint damage scores than the Chow and HFS Weanling groups.Furthermore,we observed that the HFS Weanling group did not have significant differences in knee joint damage scores relative to the Chow group.Conclusion:These findings indicate that the HFS Weanling animals were better able to cope with the dietary challenge of an HFS diet than the HFS Adult group.Interestingly,when assessing various serum proinflammatory markers,no significant differences were detected between the HTS Adult and HFS Weanling groups.Although details regarding the mechanisms underlying an increase in knee joint damage scores in the HFS Adult group remain to be elucidated,these findings indicate that dietary exposure time maybe less important than the age at which an HFS diet is introduced.Moreover,increases in serum proinflammatory mediators do not appear to be directly linked to knee joint damage scores in the HFS Weanling group animals but may be partially responsible for the observed knee joint damage in the adults over the very short time of exposure to the HFS diet. | Kelsey H.Collins Graham Z.MacDonald David A.Hart Ruth A.Seerattan Jaqueline L.Rios Raylene A.Reimer Walter Herzog | 2020 | Journal of Sport and Health Science2020，9，2： | 0 |
| 17 | Editorial re:Could sport be part……by Ring-Dimitriou et al.显示文摘Childhood obesity has become a concern in most economically developing countries.The reasons for this seem clear:too much food and not enough movement.This dilemma has received much scientific attention,and the question arises:How do we get children to move and make good eating choices?In their opinion piece in this issue of the Journal of Sport and Health Science(JSHS),Ring-Dimitriou et al.1 make an argument that playing structured and supervised traditional sports will help children with obesity,where traditional sports include football,handball,gymnastics,athletics,and martial arts. | Walter Herzog | 2019 | Journal of Sport and Health Science2019，8，4： | 0 |
| 18 | The Journal of Sport and Health Science:Commemorating a decade of publishing milestones and impact显示文摘The year 2022 marks the 10th anniversary of the Journal of Sport and Health Science(JSHS),which was launched in May 2012.The journal’s initial vision was to provide a peerreviewed,high-value,top-quality,reputable journal that would uphold the same high publication standards as other leading scientific journals dedicated to promoting excellence in the field.In just 10 years,JSHS,operating on a genuine openaccess and free-of-charge platform,has grown to become one of the most highly ranked journals in the field.In 2021,JSHS witnessed a major improvement in the journal’s Impact Factor,with a score of 13.077,placing it second among 87 journals in the Sport Sciences category;and in CiteScore,with a score of 10.8,ranking it fifth among 284 journals in the Orthopedics and Sports Medicine category(Fig.1). | Peijie Chen Walter Herzog | 2022 | Journal of Sport and Health Science2022，11，4： | 0 |
| 19 | 关于高山滑雪中前十字交叉韧带受力分析显示文摘在高山滑雪运动中,针对与前十字交叉韧带(简称ACL)撕裂相关动作进行十字交叉韧带的受力估计。膝关节处所受的合力情况与运动动作是通过运用反演动力学方法和二维双侧对称系统模型,从世界杯高山速降赛中2名滑雪运动员身上获得的。经过全面的动作分析,我们发现2名滑雪运动者ACL的受力都典型小,这是因为股四头肌阻止了在所观测的膝关节弯曲处胫骨相对于股骨的前向位移。 | Walter Herzog Lynda Read 明淑兰 王钢 | 1999 | 冰雪运动1999，21，1： | 0 |
| 20 | Fairness in Olympic sports:How can we control the increasing complexity of doping use in high performance sports?显示文摘With the Rio Olympics just a few months past,we remember the excitement,the incredible performances,and the controversies.As happens so often,the Olympic Games focus attention not only on athletic achievements but also on how athletes may reach ever-increasing levels of performance.Doping,medical | Walter Herzog | 2017 | Journal of Sport and Health Science2017，6，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员