共查询到20条相似文献，搜索用时 140 毫秒
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直到最近射击运动的生物力学研究仍没有引起足够的注意。过去由于缺乏精确记录和分析微小运动的技术手段,使得研究体育运动的形式受到限制。红外光点记录系统(SELSPOT Ⅱ SYSATEM)是一种电子运动跟踪系统,具有跟踪和记录物体或人体运动的功 相似文献
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目的:以举重抓举动作技术的快速反馈为实现目标,探索解决由于技术指标结果反馈周期过长而造成运动技术分析在科研服务中的实际效果欠佳的问题.方法:利用VICON红外光点捕获系统,同步采集抓举动作的三维运动学及地面反作用力数据并导入至自编的分析软件进行实时运动模式识别与数据修补,快速再现抓举动作的三维棍图与一系列相关的技术指标.结果:通过对两名优秀举重运动员共计20次抓举动作的反馈测试表明,所建立的抓举运动模式识别方法准确有效、反馈用时短,能满足技术训练的实践需求.结论:在红外光点捕获系统的硬件基础上开发相应的自动识别与反馈系统是一种值得尝试的运动技术分析方法,有较好的应用前景. 相似文献
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把瑞士三维测力台固定在水泥地面上,周围用木制训练台铺平,测定了六名美国优秀举重运动员在国际比赛中的动作。同时用Selspot红外光点测试系统记录杠铃的轨迹。杠铃端放上红外发光二极管,红外摄象机的光轴平行于杠,摄象机放在五米远处。这样,红外 相似文献
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利用红外光点测试系统对国家优秀马术运动员和普通学生的静、动态平衡动作进行测试与研究,探讨马术运动对人体动、静态平衡能力的影响。 相似文献
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整体动作速度力量素质训练负荷的理论研究 总被引：2，自引：0，他引：2
运用红外光点运动分析系统和三维测力台系统,对整体动作速度力量素质负重训练的最佳负荷重量进行了系统深入的研究。研究结果表明,在离体肌上实验建立的希尔方程,不适于描述整体动作的力速特点。发展整体动作速度力量素质的最佳负荷重量占最大荷重的百分比,与传统训练理论相比存在着显著性差异。 相似文献
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增强现实技术（Augmented Realitytechnique,简称AR技术）,是通过计算机图形图像技术,将虚拟信息应用到真实世界,使真实的环境和虚拟的物体实时地叠加到同一个画面或空间,实现对现实的“增强”。 相似文献
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近红外光谱术是一项新型的生物医学光子学技术,能实现组织血氧变化的载体、实时、连续、无损地检测。它以其独特地优势受到体育科研工作者的关注,并成为体育运动领域中的研究热点。文章介绍近红外光谱术的基本原理和检测的指标体系,综述该技术在体育运动领域中的研究进展,分析应用的优势并指出需要解决的主要问题,展望未来的应用前景,以期促进近红外光谱术在体育运动中的发展与应用。 相似文献
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目的:研究递增负荷运动后肌氧和血乳酸的恢复特点及特征性指标的关联性,探索恢复评价的有效指标与科学化手段.方法:14名赛艇轻量级运动员进行递增负荷运动试验,采用静止休息的方式恢复至安静状态.用近红外光谱术(NIRS)监测运动时及恢复期主动肌氧含量的变化,提取肌氧恢复幅度(H)、半恢复时(TR),计算肌氧半恢复速率(RHbO2).在运动停止后即刻及恢复期测定血乳酸,找出峰值(Blamax)及峰值出现的时间(t)、恢复至30min时的血乳酸浓度(Bla30),计算乳酸清除速率(RBla).结果:肌氧含量与血乳酸的变化与氧化代谢水平和恢复程度相适应.肌氧半恢复速率RHbO2和血乳酸清除速率RBla存在显著的正相关(r=0.791,P＜0.01),回归方程存在显著意义.结论:肌氧和血乳酸的变化在内在机制上存在必然的联系,可以反映机体的恢复水平和氧化代谢能力.将RHbO2取代传统指标RBla应用于代谢能力和恢复评价具有可行性;NIRS为训练监控的科学化发展提供了有效的检测手段. 相似文献
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运用文献资料法对2001～2011年间国内学者对举重运动中抓举技术的研究成果进行梳理希望能为后续研究者提供一些借鉴。结果显示：近十年间研究者主要从运动生物力学和训练学两个角度对抓举技术进行了研究。运动生物力学的运用以三维运动学为主结合动力学进行研究,涌现了红外光点捕获、杠杆端点自动识别、三维运动仿真等较新技术;训练学角度的研究者以一线教练员为主,通过对自身经验的传递促进了整体抓举技术训练水平的提高。 相似文献
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Wassim Moalla Abdallah Merzouk Frédéric Costes Zouhair Tabka 《Journal of sports sciences》2013,31(11):1195-1201
Abstract The aim of this study was to examine the time-course of and the relationships between muscle oxygenation, blood volume and myoelectrical manifestations during isometric exercise in children. Twelve healthy children aged 12.5 ± 1.2 years (mean ± s) performed an isometric knee extension at 50% of their maximal voluntary contraction (MVC) until exhaustion to assess endurance time (limit time, T lim). Changes in muscle oxygenation and blood volume were assessed by near infrared spectroscopy (NIRS). The root mean square (RMS) amplitude and the mean power frequency (MPF) from electromyogram (EMG) signals were obtained, as NIRS parameters, from the vastus lateralis. Mean T lim was 117 ± 34 s. The muscle oxygenation and blood volume curves decreased immediately at the beginning of exercise. Maximal deoxygenation occurred at 50% T lim, and fell by 76.9% from the resting value. Similarly, minimal blood volume was observed at 50% T lim; it reached a plateau that lasted until the end of exercise. The kinetics of the MPF and RMS curves were inversely related to time. At the last set of exercises (after 75% T lim), a steeper RMS curve and an abrupt decrease in the MPF curve were observed. Significant correlations (r) between muscle oxygenation, blood volume, root mean square amplitude and mean power frequency were observed, which ranged from 0.72 to 0.99. These findings suggest that the fatigue resulting from sustained isometric exercise is related to a decrease in oxygenation and blood volume. 相似文献
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NORIYUKI TABUCHI TOMOYUKI MATSUO KEN HASHIZUME 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(1):17-30
The aims of this study were to examine whether batters hit stationary balls at the time of peak speed of the bat head and whether the impact occurs at the lowest point of the bat trajectory. Eight university baseball players hit three balls, each hung with a string; each ball was made of a different material and was different in weight. Bat movement was captured by four 240-Hz infrared cameras and analysed three-dimensionally. Time for peak speed of the bat head varied according to the conditions. When stationary balls of standard weight were used, the bat head was at maximum speed at impact with the ball; then, it decelerated drastically owing to the impact. In contrast, maximum speed was obtained after impact when lightweight stationary balls were used. The time–speed profile of the bat head before impact in the lightweight ball condition was identical with that in the standard weight ball condition. Regardless of conditions, the timing of the lowest point of the bat head was nearly identical for each batter and most participants hit the stationary balls at about the lowest point of the bat trajectory 相似文献
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Tabuchi N Matsuo T Hashizume K 《Sports biomechanics / International Society of Biomechanics in Sports》2007,6(1):17-30
The aims of this study were to examine whether batters hit stationary balls at the time of peak speed of the bat head and whether the impact occurs at the lowest point of the bat trajectory. Eight university baseball players hit three balls, each hung with a string; each ball was made of a different material and was different in weight. Bat movement was captured by four 240-Hz infrared cameras and analysed three-dimensionally. Time for peak speed of the bat head varied according to the conditions. When stationary balls of standard weight were used, the bat head was at maximum speed at impact with the ball; then, it decelerated drastically owing to the impact. In contrast, maximum speed was obtained after impact when lightweight stationary balls were used. The time-speed profile of the bat head before impact in the lightweight ball condition was identical with that in the standard weight ball condition. Regardless of conditions, the timing of the lowest point of the bat head was nearly identical for each batter and most participants hit the stationary balls at about the lowest point of the bat trajectory. 相似文献
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S. Fryer K. J. Stone J. Sveen T. Dickson V. España-Romero D. Giles 《European Journal of Sport Science》2017,17(9):1177-1183
This study examined differences in the oxygenation kinetics and strength and endurance characteristics of boulderers and lead sport climbers. Using near infrared spectroscopy, 13-boulderers, 10-lead climbers, and 10-controls completed assessments of oxidative capacity index and muscle oxygen consumption (m?O2) in the flexor digitorum profundus (FDP), and extensor digitorum communis (EDC). Additionally, forearm strength (maximal volitional contraction MVC), endurance (force–time integral FTI at 40% MVC), and forearm volume (FAV and ΔFAV) was assessed. MVC was significantly greater in boulderers compared to lead climbers (mean difference?=?9.6, 95% CI 5.2–14?kg). FDP and EDC oxidative capacity indexes were significantly greater (p?=?.041 and .013, respectively) in lead climbers and boulderers compared to controls (mean difference?=??1.166, 95% CI (?3.264 to 0.931?s) and mean difference?=??1.120, 95% CI (?3.316 to 1.075?s), respectively) with no differences between climbing disciplines. Climbers had a significantly greater FTI compared to controls (mean difference?=?2205, 95% CI=?1114–3296 and mean difference?=?1716, 95% CI?=?553–2880, respectively) but not between disciplines. There were no significant group differences in ΔFAV or m?O2. The greater MVC in boulderers may be due to neural adaptation and not hypertrophy. A greater oxidative capacity index in both climbing groups suggests that irrespective of climbing discipline, trainers, coaches, and practitioners should consider forearm specific aerobic training to aid performance. 相似文献
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射箭运动技术诊断是该项目科学化训练的难点和要点,研究结果发现,通过超高速影像和三维红外线运动学分析的方法,以及高精度的时间、速度、位移等系列运动学指标的测量和射箭运动力学原理的综合运用,能够有效地监控射箭运动员的专项技术状态;高水平射箭运动员专项技术动作具有撒放时间短、声动反应快、箭速高、动作稳定性和一致性高的特点;另外,从功能原理与专项技术规律角度深入分析了反向动作与动作效率、动作稳定性等要素的因果关系,提出了优化撒放方式、减小反向动作幅度、增强动作控制能力是提高射箭技术水平的重要途径。 相似文献