Effect of different loading conditions on running mechanics at different velocities     

Germán Carretero-Navarro  Doménico Cherubini  Wolfgang Taube 《European Journal of Sport Science》2019,19(5):595-602

Weighted vests are widely used to improve running economy and performance. However, it is not well-studied how running mechanics are adapted to counteract the higher peak vertical ground reaction forces (Fpeak) while running with such a device. Therefore, the present study aimed to investigate the effects of different loading conditions on running mechanics at different velocities. Thirteen subjects participated in two separate sessions one week apart. In the first session, maximal aerobic speed (MAS) was determined through a maximal incremental running test while in the second session, they were instructed to run during one minute under different loading (0%, +10% and +20% of body mass [BM]) and velocity (60%, 80% and 100% of MAS) conditions in a random order. Spatiotemporal data were recorded and then running mechanics modelled using the spring-mass model. The main results indicated that vertical and leg stiffness (Kvert and Kleg, respectively) were increased (P?P?>?.05) when load was changed. At the same time, alterations of the running kinematics were observed such as longer contact times, reduced flight times, stride frequencies and step lengths, as well as an increase of the centre of mass dynamics. Based on these results it is assumed that runners maintain a certain stiffness level for each velocity despite different loading conditions. As a consequence, Fpeak increases and this probably causes spatiotemporal adjustments in the movement kinematics.  相似文献   

Genetic Polymorphism of Angiotensin II Type 1 Receptors and Their Effect on the Clinical Outcome of Captopril Treatment in Arab Iraqi Patients with Acute Coronary Syndrome (Mid Euphrates)     

Fadhaa A. Ghafil  Bassim I. Mohammad  Hussain S. Al-Janabi  Najah R. Hadi  Hayder A. Al-Aubaidy 《Indian journal of clinical biochemistry : IJCB》2021,36(1):81

Genetic variation in the angiotensin II type 1 receptor (AT1R) has an important effect on the outcome of acute coronary syndrome (ACS) initiated treatment with captopril. This study aims to investigate the impact of genetic polymorphism of AT1R (rs5186 and rs275651) on the ACS outcome in Iraqi patients treated with captopril. A total of 250 Iraqi individuals with ACS were included in this case—control study and they were divided into two study groups; Study group 1 included 125 participants who were prescribed captopril, 25 mg twice daily and study group 2 included 125 participants who received no captopril as part of their ACS treatment (control study). The AT1R gene (rs5186) CC genotype was found to be associated with ST-elevation myocardial infarction (STEMI) (Odd’s ratio (O.R) = 1.2, P = 0.7), while AC was associated with Non-ST-elevation myocardial infarction (NSTEMI) and unstable angina (UA) (O.R = 1.2, P = 0.8). AC genotype is more prone to have Percutaneous coronary intervention (PCI) after ACS attack (O.R = 1.2, P = 0.6). CC genotype had a risk to get less improvement (O.R = 1.6, P = 0.5), so might require higher doses of captopril during acute coronary insult. The AT1R gene (rs275651) AA genotype was associated with UA (O.R = 1.3, P = 0.9). AA and AT genotypes were more prone to have PCI after ACS attack (O.R = 3.9 P = 0.2, O.R = 3.5, P = 0.3 respectively) and thus requiring higher doses of captopril. We conclude that the AT1R rs5186, rs275651 genetic polymorphisms might partially affect the clinical outcome of ACS patients treated with captopril and might have captopril resistance which requires higher doses.  相似文献   

中长跑项目多课次训练模式   总被引：4，自引：0，他引：4  

毕红星 《山东体育科技》2003,25(4):3-4,9

对中长跑“多课次”训练的概念、必要性、生理学基础等进行较为详细的论述，并对“多课次”训练计划的安排及应注意的问题作了说明，旨在丰富中长跑训练的方法手段，保证训练的质量，尽快提高成绩。研究认为。中长跑采用“多课次”训练是可行的。也是必要的，是科学化运动训练的一大体现。建议：“多课次”训练时间的安排，应突破传统的条条框框。在全天24小时内合理安排。实践中逐步摸索出适合每位运动员最为科学的训练课次及运动负荷量。  相似文献   

谈谈短跑训练的几点体会     

罗自力 《湖北体育科技》2001,20(2):85-86

根据少年短跑运动员生长发育和项目特点，探讨了以短跑技术为中心的全面身体训练，发展步长、步频、速度耐力，掌握跑的放松技能，心理训练，合理的营养等。  相似文献   

400m内外侧弯道跑速度变化之研究     

陈全林  阎小云 《辽宁体育科技》2004,26(6):44-45

运用生物力学分析法，对400m栏内、外侧弯道跑的栏间跑和左、右腿攻栏的栏上技术进行分析，结果是不论右腿攻栏还是左腿攻栏，外侧跑道弯道跑成绩都好于内侧跑道弯道跑成绩。  相似文献   

少年中长跑运动员跑的经济性与运动成绩关系研究   总被引：4，自引：0，他引：4  

蔡秋  卢亮球 《广州体育学院学报》2004,24(6):66-68,76

以体校男女各13名少年运动员为研究对象,采用跑台逐级递增负荷运动试验测试最大吸氧量,并以24m·min-1的恒定跑台速度测试跑的经济性RE,呼出气体通过JaegerEOS心肺功能测试仪,用开放式气体测试法分析。文中运动员成绩均为竞赛成绩。实验结果表明,跑的经济性RE(ml·kg-1·min-1)无显著性性别差异(P>0.05),但个体间存在较大的差异。RE(ml·kg-1·min-1)与1500m、400m跑运动成绩无显著性相关,RE(％V2max)与10km跑成绩呈显著相关。提示RE在较长距离跑中起重要作用。运动员想提高耐力水平,可以通过提高最大有氧能力或改善技术以提高经济性这两种方法实现。  相似文献   

春秋战国时期军队的跑跳训练     

刘玉良  张文韬  刘怀祥 《南京体育学院学报(社会科学版)》2004,18(4):50-52

在冷兵器时代，军队行军强调速度对作战胜负具有极为重要作用。因此，我国古代兵家十分重视加强对军队的体能训练。跑跳项目就是当时训练提高体能的重要手段，在军事理论和军事体育实践中积累了宝贵经验。春秋战国时期军队的跑跳训练便是冷兵器时代军队体能训练的典型。  相似文献   

100m跑运动员体能指标研究综述   总被引：1，自引：0，他引：1  

袁运平  戴名辉 《沈阳体育学院学报》2004,23(2):151-154

根据运动员体能结构的关系,从体能指标角度对运动员的体能进行系统地研究。结果表明,近些年来国内外对100m跑运动员的研究从整体上讲较为分散零碎,缺乏整体系统性。主要表现在这些研究多从微观入手,过多关注的是体能具体分类指标本身,从系统的观点对100m跑运动员体能水平的综合整体研究还比较薄弱。  相似文献   

Study of transport behavior for Fe-doping La_(0.67)Ca_(0.33)MnO_3 perovskite manganese     

《Journal of Zhejiang University. Science. B》2004,(5)

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凝练体院办学理念构建创新发展战略     

许宗祥 《广州体育学院学报》2004,24(6):1-3

高校办学理念是对高校办学过程中一些基本问题的价值判断，它体现了大学的理想与价值追求。本文在追溯我国高等体育办学理念的基础上，对广州体院的办学理念从三个方面进行了阐述：创新是灵魂、质量是生命、特色求发展。  相似文献