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| 1 | Is changing footstrike pattern beneficial to runners?显示文摘Some researchers, running instructors, and coaches have suggested that the 'optimal' footstrike pattern to improve performance and reduce running injuries is to land using a mid-or forefoot strike. Thus, it has been recommended that runners who use a rearfoot strike would benefit by changing their footstrike although there is little scientific evidence for suggesting such a change. The rearfoot strike is clearly more prevalent. The major reasons often given for changing to a mid-or forefoot strike are(1) it is more economical;(2) there is a reduction in the impact peak and loading rate of the vertical component of the ground reaction force; and(3) there is a reduction in the risk of a running-related injuries. In this paper,we critique these 3 suggestions and provide alternate explanations that may provide contradictory evidence for altering one's footstrike pattern.We have concluded, based on examining the research literature, that changing to a mid-or forefoot strike does not improve running economy, does not eliminate an impact at the foot-ground contact, and does not reduce the risk of running-related injuries. | Joseph Hamill Allison H.Gruber | 2017 | Journal of Sport and Health Science2017，6，2： | 5 |
| 2 | 传统溶剂提取法和超临界流体萃取法对钟花蒲桃次生代谢产物的回收率的比较研究(英文)显示文摘目的:寻求一种最佳的钟花蒲桃次生代谢产物的萃取方法,以实现在工业上的应用。创新点:全面深入地比较传统溶剂提取法和超临界流体萃取法对钟花蒲桃的主要次生代谢产物的回收率。方法:在超临界流体萃取法中,应用Box-Behnken设计,以压力、温度和萃取粒径大小为自变量,以粗提取物、个别的和总的次生代谢产物的百分比产量为因变量。另外,还研究了调节剂乙醇对产量的影响。在传统溶剂提取中,结合十种不同的溶剂和三不同的技术(浸提、索氏和回流)产生二十种不同的提取产物。通过高效液相色谱法检测不同的提取方法对钟花蒲桃的主要次生代谢产物的回收率。结论:超临界流体萃取法优于传统溶剂提取法,省成本又省时。因此在工业使用上,超临界流体萃取法可替代传统溶剂提取法。 | Abdul Hakeem MEMON Mohammad Shahrul Ridzuan HAMIL Madeeha LAGHARI Fahim RITHWAN Salman ZHARI Mohammed Ali Ahmed SAEED Zhari ISMAIL Amin Malik Shah Abdul MAJID | 2016 | Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)2016，17，9： | 2 |
| 3 | Moving fast, thinking fast:The relations of physical activity levels and bouts to neuroelectric indices of inhibitory control in preadolescents显示文摘Background:Structured vigorous physical activity(VPA)can improve cognitive control in children,but studies relating daily physical activity(PA)to cognitive control have yielded conflicting findings.While objectively measured daily PA summarizes all occurrences of PA within a registered period,a minimum duration of continuous PA is required for registration of a PA bout.Because brief bouts of high-intensity PA can account for a large proportion of children’s daily activity-related energy expenditure,this study assessed whether daily and bouted VPA were selectively related to cognitive control in preadolescents relative to other PA intensities.Methods:A total of 75 children between the ages of 8 and 10 years(49%girls)wore an ActiGraph wGT 3 X+on the hip for 7 days.The acceleration signal from the vertical axis was summarized over 1 s,5 s,and 15 s epochs.Daily and boutecd modercate PA,moderate-to-vigorous PA,and VPA were measured.PA bouts were expressed as the frequency and time spent in 2 different continuous PA bouts,one lasting≥10 s and the other lasting≥30 s at a given intensity.Inhibitory control was assessed using behavioral responses to a modified flanker task(mean reaction time(RTmean)and accuracy).Attentional resource allocation and co gnitive processing speed were measured using the amplitude and latency of the P3 component of event-related brain potentials,respectively.Associations between PA,behavioral indices of inhibitory control,P3 amplitude,and latency were assessed using hierarchical regression models.Results:Daily VPA was not related to RTmean or accuracy on either congruent or incongruent trials.In contrast,more time spent in VPA bouts lasting≥30 s predicted shorter P3 latency across epochs and flanker congruencies(allβ≤-0.24,all p≤0.04).The associations between shorter P3 latency and the time spent in moderate-to-vigorous PA bouts lasting≥30 s were less consistent and largely limited to congruent trials(congruent:β(-0.3 1,-0.34)).No significant associations were observed upon correction for false discovery rate.Conclusion:The pattern of uncorrected associations aligns with the dose-response literature and suggests that brief VPA bouts may yield the greatest benefits to cognitive processing speed in preadolescents.Future studies using measures of brain structure and function are needed to understand the mechanisms linking bouted VPA to neurocognitive function during childhood. | Dominika M.Pindus Eric S.Drollette Lauren B.Raine Shih-Chun Kao Naiman Khan Daniel R.Westfall Morgan Hamill Rebecca Shorin Emily Calobrisi Dinesh John Arthur F.Kramer Charles H.Hillman | 2019 | Journal of Sport and Health Science2019，8，4： | 2 |
| 4 | 动态系统理论的概念与技术在生物力学分析中的应用(英文)显示文摘Traditional biomechanical analyses of human movement are generally derived from linear mathematics.While these methods can be useful in many situations,they do not describe behaviors in human systems that are predominately nonlinear.For this reason,nonlinear analysis methods based on a dynamical systems approach have become more prevalent in recent literature.These analysis techniques have provided new insights into how systems(1) maintain pattern stability,(2) transition into new states,and(3) are governed by short-and long-term(fractal) correlational processes at different spatio-temporal scales.These different aspects of system dynamics are typically investigated using concepts related to variability,stability,complexity,and adaptability.The purpose of this paper is to compare and contrast these different concepts and demonstrate that,although related,these terms represent fundamentally different aspects of system dynamics.In particular,we argue that variability should not uniformly be equated with stability or complexity of movement.In addition,current dynamic stability measures based on nonlinear analysis methods(such as the finite maximal Lyapunov exponent) can reveal local instabilities in movement dynamics,but the degree to which these local instabilities relate to global postural and gait stability and the ability to resist external perturbations remains to be explored.Finally,systematic studies are needed to relate observed reductions in complexity with aging and disease to the adaptive capabilities of the movement system and how complexity changes as a function of different task constraints. | Richard E.A.van Emmerik Scott W.Ducharme Avelino C.Amado Joseph Hamill | 2016 | Journal of Sport and Health Science2016，5，1： | 2 |
| 5 | 前脚掌着地和后脚跟着地跑步中的冲击震动频率成分及衰减(英文)显示文摘背景:研究显示,与脚后跟着地跑步模式相比,前脚掌着地跑步模式可通过降低冲击相关参数来降低引发跑步相关的过劳性损伤的风险。但现有研究仅比较了不同着地模式冲击参数的时域部分。由于冲击震动的频率成分和衰减度可能对损伤风险及预防非常重要,因此本研究旨在探究后脚跟着地和前脚掌着地跑步者的头部和胫骨加速信号功率以及冲击衰减方面的差别。方法:选取惯用后脚跟和前脚掌着地的跑步者各19名,让其按照各自习惯使用的着地模式,以3.5m/s的速度在跑步机上跑步,收集其胫骨和头部加速数据,计算第1和第2个头部加速峰值的量级和胫骨正向加速度峰值。计算各个信号的功率谱密度来转换头部加速度的频域部分,用相当于胫骨的头部信号的转换函数计算冲击衰减。结果:后脚跟着地时胫骨的正向加速度峰值和信号功率在较低和较高的范围内明显大于前脚掌着地(p<0.05)。第1和第2个头部加速度峰值和头部信号功率在两种跑步模式下均无明显差异(p>0.05)。后脚跟着地跑步模式下,由于胫骨加速度增大,冲击衰减度在较低和较高的范围内均会增大(p<0.05)。结论:不同跑步模式冲击震动频率成分不同,说明衰减的主要机制有差异。虽然冲击衰减机制和运动损伤间的关系尚不清晰,但因冲击成分不同,也许两种跑步模式都无法有效避免损伤,不同模式中的持续损伤类型各不相同。 | Allison H.Gruber Katherine A.Boyer Timothy R.Derrick Joseph Hamill | 2014 | Journal of Sport and Health Science2014，3，2： | 2 |
| 6 | Selection of new banana varieties for the cool subtropics in Australia显示文摘 | SMITH M K HAMILL S D LANGDON P W | 1998 | Acta Hort1998，490，： | 2 |
| 7 | Structural and functional characteristics of lung macro- and microvascular endothelial cell phenotypes显示文摘 | King J Hamil T Creighton J | 2004 | Microvasc Res2004，167，2： | 1 |
| 8 | The use of the polymerase chain reaction in plant transformation studies显示文摘 | John D Hamill Steven Rotmsley | 1991 | Plant Cell Reports1991，10，5： | 1 |
| 9 | Variation in the IGF2 gene promoter region is associated with intra?muscular fat content in porcine skeletal muscle显示文摘 | Asian 0 Hamill R Mv Davey G | 2012 | Mol BioI Rep2012，39，4： | 1 |
| 10 | Identification,characterization and evolution of a primate β-defensin gene cluster显示文摘 | Radhakrishnan Y Hamil K.G Yenugu S | | 0，，： | 1 |
| 11 | The androgenregulated epididymal sperm-binding protein,human beta-defensin 118(DEFB118) (formerly ESC42),is an antimicrobial beta-defensin显示文摘 | Yenugu S Hamil KG Radhakrishnan Y French FS Hall SH | | 0，，07： | 1 |
| 12 | Improved patch-clamp techniques for high-resolution current recording from cells and cell-free membrane patches显示文摘 | O. P. Hamill A. Marty E. Neher B. Sakmann F. J. Sigworth | 1981 | Pflügers Archiv European Journal of Physiology1981，，2： | 1 |
| 13 | Debate: to fuse or not to fuse to thesacrum, the fate of the L5- S1 disc 显示文摘 | Polly DW Jr Hamill CL Bridwell KH | 2006 | Spine2006，31，19： | 1 |
| 14 | Dehydroepiandrosterone activates mutant androgen receptors expressed in the androgen-dependent hu- man prostate cancer xenograft CWR22 and LNCaP cells显示文摘 | Tan J Sharief Y Hamil KG | 1997 | Mol En- docrinol1997，11，4： | 1 |
| 15 | Modelling the influence of inulin as a fat substitute in comminuted meat products on their physico-chemical characteristics and eating quality using a mixture design approach显示文摘 | Derek F. Keenan Virginia C. Resconi Joseph P. Kerry Ruth M. Hamill | 2014 | Meat Science2014，，3： | 1 |
| 16 | Descemets stripping endothelial keratoplasty under topical anesthesia显示文摘 | Fang JP Hamill MB | 2007 | J Cataract Refract Surg2007，33，2： | 1 |
| 17 | Improvement of power supply EMC by chaos显示文摘 | HAMIL D C | 1996 | Electronics Letters1996，32，12： | 1 |
| 18 | Improved patch-clamp techniques for high-resolution current recording from cells and cell-free membrane patches 显示文摘 | Hamill O P Marty A Neher E | 1981 | Pflfigers Arch1981，391，2： | 1 |
| 19 | The androgen-regulated epididymal sperm-binding protein, human beta-defensin 118 ( DEFB 118) ( formerly ESC42) , is an antimicrobial beta-defensin 显示文摘 | YENUGU S HAMIL KG RADHAKRISHNAN Y | 2004 | Endocrinology2004，145，： | 1 |
| 20 | Improved patch clamp techniques for high-resolution current recording from cells and cell-free membrane patchs 显示文摘 | HAMILL OP MARTY A NEHER E | 1981 | Pflfigers Arch1981，391，2： | 1 |
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