Association between knee-to-hip flexion ratio during single-leg vertical landings,and strength and range of motion in professional soccer players     

Gustavo Leporace  Marcio Tannure  Gabriel Zeitoune  Leonardo Metsavaht  Moacir Marocolo  Alex Souto Maior 《Sports biomechanics / International Society of Biomechanics in Sports》2020,19(3):411-420

Abstract

The aim of this study was to test the correlation between knee-to-hip flexion ratio during a single leg landing task and hip and knee strength, and ankle range of motion. Twenty-four male participants from a professional soccer team performed a continuous single leg jump-landing test during 10s, while lower limb kinematics data were collected using a motion analysis system. After biomechanical testing, maximal isometric hip (abduction, extension, external rotation), knee extension and flexion strength were measured. Maximum ankle dorsiflexion range of motion was assessed statically using the weight bearing lunge test. Pearson correlation coefficients were calculated to determine the associations between the predictor variables (knee and hip strength, and ankle ROM) and the main outcome measure (knee-to-hip flexion ratio). Correlation between knee-to-hip flexion ratio and hip abductors strength was significant (r = ?0.47; p = 0.019). No other significant correlations were observed among the variables (p > 0.05). These results demonstrated that a lower hip abductors strength in male soccer players was correlated with a high knee-to-hip flexion ratio during landing from a single leg jump, potentially increasing knee overload by decreasing energy absorption at the hip. The results provide a novel proposal for the functioning of hip muscles to control knee overload.  相似文献   

Optimised force-velocity training during pre-season enhances physical performance in professional rugby league players     

Adam Simpson  Mark Waldron  Emily Cushion  Jamie Tallent 《Journal of sports sciences》2021,39(1):91-100

ABSTRACT

The effectiveness of 8-week force-velocity optimised training was assessed in highly trained professional rugby league athletes. Players (age 24 ± 3 years; body mass 94.9 ± 21.6 kg; height 181.3 ± 6.0 cm) were strength-matched and assigned to a force-velocity optimised group (OP; n = 15) or a general strength-power group (GP; n = 14). Tests included 10-m, 20-m sprints, 3 repetition-maximum squat and squat jumps over five load conditions to ascertain vertical force-velocity relationship. ANCOVA revealed there was a group effect for force-velocity deficit (P < 0.001), with the OP two-fold greater than the GP group (OP pre: 51.13 ± 31.42%, post: 62.26 ± 31.45%, GP pre: 33.00 ± 19.60%, post: 31.14 ± 31.45%, P < 0.001). There were further group effects for 3RM squat (OP pre: 151.17 ± 22.95 kg, post: 162.17 ± 24.16 kg, GP pre: 156.43 ± 25.07 kg, post: 163.39 ± 25.39 kg, P < 0.001), peak power (OP pre: 3195 ± 949 W, post: 3552 ± 1033 W, GP pre: 3468 ± 911 W, post: 3591 ± 936 W, P < 0.001), and SJ (OP pre: 39.79 ± 7.80 cm, post: 42.69 ± 7.83 cm, GP pre: 40.44 ± 6.23 cm, post: 41.14 ± 5.66 cm, P < 0.001). Prescribing F-V deficit training is superior for improving physical performance within highly trained RL players.  相似文献   

女子排球运动员弹跳力功能诊断模型构建及实验研究     

王骏昇  钟秉枢 《北京体育大学学报》2018,41(5):100-106

摘要：弹跳力是排球运动员的重要专项素质,选择恰当的动作训练方法、合适的力量主题是提高弹跳力的重点。通过专家访谈法构建弹跳力诊断模型,通过测试法分析弹性贡献、摆臂贡献和助跑贡献等诊断指标,通过实验法验证相应力量主题的动作训练对弹跳力的提高效果。发现：1）排球运动员弹跳力功能诊断模型包括蹲跳、下蹲跳、摆臂下蹲跳和助跑起跳四个测试动作,弹性贡献、摆臂贡献、助跑贡献三个诊断指标,通过诊断标准可以有效评价个体弹跳力弱环节,通过相应力量主题的动作训练可以针对性地提高弹跳力。2）弹跳高的运动员也可能在诊断指标中存在弱环节,弹跳力与环节动作的速度力量、爆发力、反应力量以及摆臂幅度高度相关。3）提高弹跳力,弹性贡献大的运动员应进行最少8周最大力量+速度力量/反应力量的动作训练;弹性贡献小的运动员进行最少4周速度力量/反应力量的动作训练。摆臂贡献小的运动员,改进摆臂幅度,同时加强摆臂动作的爆发力,可以提高摆臂贡献,进而提高弹跳力。助跑贡献小的运动员,进行助跑动作的速度力量和反应力量训练对弹跳力有一定促进作用。  相似文献   

湘西苗族跳鼓活动发展现状与对策研究   总被引：1，自引：0，他引：1  

刘邦华  周怀球 《体育科技文献通报》2010,18(11):96-98

本文采用查阅文献资料、调查访问、专家访谈、逻辑分析等方法，以五代苗族鼓王跳鼓为主线，分析湘西苗族跳鼓活动的内容种类、形式、场地器材以及跳鼓王跳鼓特点等现状。提出发展湘西苗族跳鼓活动应加强湘西苗族跳鼓运动的挖掘和提炼整理、加强湘西民族传统体育专项科研队伍和人才队伍建设、完善和建立健全湘西民族传统体育发展的组织保障、强化跳鼓运动的民族传统特色，发挥跳鼓活动的观赏价值、走学校发展路线，从学校开始普及跳鼓等民族传统体育活动、倡导全民健身理念，普及广大社会群体参与跳鼓活动等对策，为湘西苗族跳鼓民族传统体育的发展和推广提供参考意见。  相似文献   

Altitude and wind effects on long jump performance with particular reference to the world record established by Bob Beamon     

A.J. Ward‐Smith 《Journal of sports sciences》2013,31(2):89-99

An analysis of long jump performance, including both the approach and aerial phases, is applied to Bob Beamon's legendary leap at the Mexico City Olympic Games of 1968. It is shown that the combined effects of altitude and wind assistance yielded an increment in the length of the jump of about 31 cm, compared to a corresponding jump at sea level under still air conditions. The main factor is shown to be the increased sprinting speed attained under favourable conditions of wind and altitude.  相似文献   

比较优势与江西崛起--走出江西看江西发展     

郭台辉 《宜春学院学报》2003,25(1):49-52

江西在中部地区迅速崛起具备资源比较优势，包括区位和自然，人文等。本文基于省情的客观分析提出发展方向及其具体思路，并指出政府在崛起中大有作为，即制度创新，规范行为和观念转变的引导。  相似文献   

对影响人体爆发力某些因素的研究     

喻薇  倪宏竹李鑫 《黑龙江科技信息》2007,(1X):124-124

通过对西安体育学院不同专项44名学生进行“纵跳”测验进而对爆发力进行测量。通过测量纵跳高度、肌围度、足弓形态，来分析其各项指标之间的关系及其对爆发力的影响。  相似文献   

对跳远两种技术的初步探讨     

毛立力 《宁波教育学院学报》2002,4(1):53-55

以世界优秀跳远选手刘易斯和埃米扬的典型两跳为参照,分析了我国优秀跳远运动员在助跑速度、绝对速度、速度利用率、腾起角度与两选手之间的差异,提出了近期内练就刘易斯一样以速度见长的技术特点（低跳跃型）可能性不大的情况下,适度调整垂直速度和水平速度的比例,降低助跑速度利用率,增大腾起角,走埃米扬力量见长（高跳跃型）技术之路,是我国优秀跳远运动员提高成绩的有效途径。  相似文献   

从换路定律证明看扩充实数的必要性     

张翠明  张明虎 《石家庄职业技术学院学报》2011,23(4):19-20

指出了在电路分析课程中换路定律证明方面存在的矛盾,证明矛盾的根源在于实数的完备性,并依此说明了建立广义实数概念的必要性.  相似文献   

"合三为一"与"摆跳"——现代背越式跳高起跳技术的动力学分析   总被引：3，自引：0，他引：3  

林明 《西安体育学院学报》2007,24(1):101-104

运用生物力学研究方法,分析了弧线助跑身体内倾是水平速度转化为垂直速度的有效途径,这种速度的转换是背越式跳高优势所在,是从最后助跑2-3步降低身体重心,可加大起跳垂直工作距离,起跳实质是三种旋转力结合(三合一)在一起才能有效地把助跑获得水平速度转化为垂直上升速度,将摆动腿动作在起跳过程中的作用上升到用“摆动腿来起跳”这一高度来认知,有利于理解起跳动作实质,有利于在实践中正确指导训练,是技术训练的突破口。摆动腿蹬伸动作转化的越快,起跳效果就会越好。  相似文献