共查询到19条相似文献，搜索用时 921 毫秒
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为揭示速度轮滑双蹬技术的规律和特征,正确理解速度轮滑双蹬技术动作原理,为寻找更先进和省力的速度轮滑技术提供科学依据。运用足底压力分布测试系统,以专业轮滑运动员为研究对象,获取不同速度滑行过程运动员在双蹬技术一个单步中的足底动力学参数。结果说明足底压力随时间变化是影响速度轮滑蹬动效果的主要因素;不同的足底压力传递特征体现了不同的技术动作,从而形成不同的运动效果;在快速滑行中双蹬技术更有利于保持身体平衡。 相似文献
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以上海市蹦床队5名一线男子运动员为研究对象，通过视频与足底压力同步测试的研究方法，对蹦床运动员的预跳和5个基本的技术动作进行测试，研究男子蹦床运动员在完成不同基本技术动作过程中足底压力的分布的特征及足底压力分布的一般规律。为蹦床运动员进行科学训练提供理论依据，为蹦床运动员运动技术诊断提供客观指标。研究结论：运动员完成不同基本技术动作足底压力分布特征规律相同，足底压力合力变化、压强峰值分布和压力中心变化无显著性差异。触网起跳过程双足压力合力呈单峰曲线网面达最低点时双足压力合力最大，双足压力合力最大值可达体重的3.04倍。压强峰值表现为双足第五趾骨区较高。运动员在起网蹬伸阶段双足呈现出压力中心偏移现象，与运动员起跳过程中双足用力不均有关。 相似文献
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对速度轮滑双推技术的研究 总被引：3，自引：1，他引：2
通过对速度轮滑双推技术（double-push)的历史、动作要领，以及双推技术和传统的技术相比的特点和优越性进行简要的阐述，为广大速度轮滑爱好者及运动员掌握双推技术奠定基础。 相似文献
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应用运动生物力学原理,对乒乓球运动中三种步法的足底压力进行分析,得到以下主要结论：乒乓球典型步法动作过程中双脚的足底压力主要承载区域集中在足前区,足中区受力不明显。击球发力脚足后区足底压力峰值交叉步步法最大,并步步法次之,跨步步法最小。前足中区为足前区较为稳定的主要受力区域,前足外侧区和前足内侧区所受足底压力峰值的大小与步法的动作形式有关。 相似文献
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对Novel Pedar足底压力分布测量系统应用技术的初步开发 总被引：5，自引：1，他引：4
运动员的运动技术动作和足底对地面的作用压力分布有着密切的关系 ,因此如何测试运动员足底作用压力分布并得出准确数据显得非常重要。通过对最新引进的德国 Novel Pedar足底压力分布测量系统进行开发 ,发现其系统软件具有应用技术功能 ,得出落地瞬间足底压力的分布图及最大力、每 cm2 最大压力、每 cm2 平均压力的参数值 ,绘制出步态的压力峰值三维示意图和落地瞬间压力曲线图 ,为提高运动技术诊断提供重要的科学依据 相似文献
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根据作者的体验,对速度轮滑双推技术的原理及其应用进行分析.重点分析了双推时浮腿的落地时机与落地占的相互关系、双推滑行中的双支撑、上体摆动及几个关键角度及重心移动问题.由此得出结论,正确掌握和运用上述要领是提高运动水平的有效手段. 相似文献
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采用RSscan足底压力鞋垫测试系统,对山东省优秀女子竞走运动员技术周期足底压力进行采集,通过统计学方法对其进行分析,探讨竞走技术周期的足底压力分布特征.研究结果表明,山东省女子竞走运动员着地阶段足跟外侧压强峰值最大,压力中心由外侧过渡到前脚掌,离地阶段前脚掌压强峰值最大,90%的受试者腾空时间都在模糊腾空时间以下,符合国际竞走技术要求.但大脚趾扒地力量太小,不利于后摆腿充分蹬地. 相似文献
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Biomechanical comparison of the double-push technique and the conventional skate skiing technique in cross-country sprint skiing 总被引：1，自引：0，他引：1
The aims of the study were to: (1) adapt the "double-push" technique from inline skating to cross-country skiing; (2) compare this new skiing technique with the conventional skate skiing cross-country technique; and (3) test the hypothesis that the double-push technique improves skiing speed in a short sprint. 13 elite skiers performed maximum-speed sprints over 100 m using the double-push skate skiing technique and using the conventional "V2" skate skiing technique. Pole and plantar forces, knee angle, cycle characteristics, and electromyography of nine lower body muscles were analysed. We found that the double-push technique could be successfully transferred to cross-country skiing, and that this new technique is faster than the conventional skate skiing technique. The double-push technique was 2.9 +/- 2.2% faster (P < 0.001), which corresponds to a time advantage of 0.41 +/- 0.31 s over 100 m. The double-push technique had a longer cycle length and a lower cycle rate, and it was characterized by higher muscle activity, higher knee extension amplitudes and velocities, and higher peak foot forces, especially in the first phase of the push-off. Also, the foot was more loaded laterally in the double-push technique than in the conventional skate skiing technique. 相似文献
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我国女子优秀跳高运动员起跳过程足底压力特征分析 总被引：1，自引：1，他引：0
通过对3名女子优秀跳高运动员起跳过程三维摄像和足底压力的同步测量分析，结果显示：起跳过程足底总压强变化呈双峰型；单个传感器上最大压强出现在外侧足跟区的后外侧；各区最大压强大小排列顺序：内、外侧足跟、中间跖骨最大压强位于前4位，内侧足弓、大拇趾区受到的最大压强位于后4位；中间跖骨区累计压强最大，内侧足弓区累计压强最小。 相似文献
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Abstract The aims of the study were to: (1) adapt the “double-push” technique from inline skating to cross-country skiing; (2) compare this new skiing technique with the conventional skate skiing cross-country technique; and (3) test the hypothesis that the double-push technique improves skiing speed in a short sprint. 13 elite skiers performed maximum-speed sprints over 100 m using the double-push skate skiing technique and using the conventional “V2” skate skiing technique. Pole and plantar forces, knee angle, cycle characteristics, and electromyography of nine lower body muscles were analysed. We found that the double-push technique could be successfully transferred to cross-country skiing, and that this new technique is faster than the conventional skate skiing technique. The double-push technique was 2.9 ± 2.2% faster (P < 0.001), which corresponds to a time advantage of 0.41 ± 0.31 s over 100 m. The double-push technique had a longer cycle length and a lower cycle rate, and it was characterized by higher muscle activity, higher knee extension amplitudes and velocities, and higher peak foot forces, especially in the first phase of the push-off. Also, the foot was more loaded laterally in the double-push technique than in the conventional skate skiing technique. 相似文献
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对速度轮滑直道双蹬技术的探讨 总被引：3，自引：3，他引：0
通过对速度轮滑直道双向蹬地技术的具体研究分析,设计了“双蹬技术”动作周期示意图。对双蹬技术的优越性和适用性进行了阐述,并对速度轮滑和速度滑冰界提出了几点建议。 相似文献
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Raoul Reiser II Jon Watt Michael Peterson 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(2):237-249
The resistance against a cyclist while riding on rollers is due mainly to rolling resistance produced by the deformation of the tyre as it rolls against small diameter drums. Resistance is then combined with wheel speed to set power output. The effect of tyre pressure and cross‐section on power was investigated by systematically altering the pressure (552 kPa, 690 kPa, and 827 kPa) in a 20c, 23c, 25c, and 28c tyre of the same design while riding at a wheel speed of 45 kph. Average power over 1 minute was measured with a Power Tap Hub (Tune Corporation, Cambridge, Massachusetts, USA) on five occasions. Statistical significance was evaluated at p < 0.05. Power requirements increased significantly with each reduction in tyre pressure for all tyres and pressures except the 25c between 690 and 827 kPa. The 20c tyre required significantly more power from the cyclist at each tested tyre pressure when compared to the other tyres (which were not different from each other). The differences in resistance from tyre size were not observed when ridden on the road. Additionally, a slightly different tyre design from the same manufacturer responded similarly in the 20c, but was significantly different in the 23c size. It was also observed that power requirements increased significantly when both the wheels were ridden on the rollers as compared to just the rear wheel. These results indicate that the power requirements may be significantly altered by the cyclist by adjusting tyre pressure, tyre cross‐section size, tyre type, and with the number of wheels contacting the rollers. However, the magnitude of these power requirements may not be suitable for intense workouts of trained cyclists. 相似文献
16.
Reiser R Watt J Peterson M 《Sports biomechanics / International Society of Biomechanics in Sports》2003,2(2):237-249
The resistance against a cyclist while riding on rollers is due mainly to rolling resistance produced by the deformation of the tyre as it rolls against small diameter drums. Resistance is then combined with wheel speed to set power output. The effect of tyre pressure and cross-section on power was investigated by systematically altering the pressure (552 kPa, 690 kPa, and 827 KPa) in a 20c, 23c, 25c, and 28c tyre of the same design while riding at a wheel speed of 45 kph. Average power over 1 minute was measured with a Power Tap Hub (Tune Corporation, Cambridge, Massachusetts, USA) on five occasions. Statistical significance was evaluated at p < 0.05. Power requirements increased significantly with each reduction in tyre pressure for all tyres and pressures except the 25c between 690 and 827 kPa. The 20c tyre required significantly more power from the cyclist at each tested tyre pressure when compared to the other tyres (which were not different from each other). The differences in resistance from tyre size were not observed when ridden on the road. Additionally, a slightly different tyre design from the same manufacturer responded similarly in the 20c, but was significantly different in the 23c size. It was also observed that power requirements increased significantly when both the wheels were ridden on the rollers as compared to just the rear wheel. These results indicate that the power requirements may be significantly altered by the cyclist by adjusting tyre pressure, tyre cross-section size, tyre type, and with the number of wheels contacting the rollers. However, the magnitude of these power requirements may not be suitable for intense workouts of trained cyclists. 相似文献
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运用鞋垫式足底压力测试系统,对前中国男排主攻队员隋盛胜四号位扣球起跳技术的足底压力参数进行了采集和分析。结果表明：右腿贡献大于左腿;右足后区首先着地,之后由足中区过渡到足前区。左足后区首先着地,之后依次是足前区和足中区,足后区、足前区和足中区的着地时间均相差2ms;蹬伸到离地阶段,左、右足均有内旋动作;左、右足的最大压力峰值和平均压力按从大到小的顺序均出现在足前区、足后区和足中区。 相似文献
18.
Thomas Maier Beat Müller Remo Allemann Thomas Steiner Jon Peter Wehrlin 《Journal of sports sciences》2019,37(7):833-838
The rim width of cross-country mountain bike wheel sets has increased in recent years, but the effect of this increase on performance remains unknown. The aim of this study was to analyse the influence of rim width on rolling resistance and off-road speed. We compared 3 tubeless wheel sets: 25 mm inner width as baseline, 30 mm width with the same tyre stiffness, and 30 mm width with the same tyre pressure. Three riders conducted 75 rolling resistance tests for each wheel set on a cross-country course. We determined rolling resistance using the virtual elevation method and calculated off-road speeds for flat and uphill conditions using a mathematical model. Baseline rolling resistance (Cr) was 0.0298, 90% CI [0.0286, 0.0310], which decreased by 1.4%, [0.7, 2.2] with the wider rim and the same tyre stiffness and increased by 0.9%, [0.1, 1.6] with the wider rim and the same tyre pressure. The corresponding effects on off-road speed were most likely trivial (0.0% to 0.7% faster and 0.1% to 0.6% slower, respectively). Because the effect of rim width on off-road speed seems negligible, athletes should choose the rim width that offers the best bike handling and should experiment with low tyre pressures. 相似文献
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进入20世纪,世界速度滑冰运动借助现代科学与技术方法,使运动水平不断提高,特别是KLAP冰刀的研究与应用推动了运动成绩的飞跃。随着速度滑冰成绩的不断提高,寻找速度滑冰冰刀新结构成了未来发展的趋势。通过新型KLAP速滑冰刀铰链结构进行分析研究,结合鞋垫式压力传感器测试分析,提出将新型冰刀铰链压力点后移并附有铰链过程蓄能、下刀有弹性缓冲的新型结构的速滑冰刀铰链结构设计。寻找运动员在运动过程中冰刀铰链结构的力学机理,发现不足并进行改进,已达到探索冰刀结构技术潜能的目的。 相似文献