排序方式： 共有61条查询结果，搜索用时 15 毫秒
41.
Yasuharu Nagano Hirofumi Ida Masami Akai Toru Fukubayashi 《Journal of sports sciences》2013,31(14):1525-1534
Abstract Female athletes are considered to exhibit knee and trunk motion that is characteristic of anterior cruciate ligament (ACL) injury. The aim of this study was to examine the in vivo motion of the trunk and knee during a cutting manoeuvre and determine the relationship between them. All participants (10 male and 10 female college athletes) performed a shuttle run cutting task with the left limb. Trunk inclination (forward and lateral) and knee joint angles (flexion/extension, abduction/adduction, and internal/external tibial rotation) were calculated. Differences between the sexes and associations between knee motion and trunk inclination were examined. An increase in trunk forward inclination was strongly correlated with an increase in knee flexion angle and moderately correlated with a decrease in the excursion of internal tibial rotation. An increase in right trunk lateral inclination was moderately correlated with an increase in excursion of internal tibial rotation. The results also showed differences between the sexes in trunk forward inclination, lateral inclination, and knee flexion angle, but no such differences in knee abduction or internal tibial rotation. Trunk inclination is related to knee flexion and excursion of internal tibial rotation. Female athletes demonstrate a low trunk forward inclination and knee flexion angle, a posture that resembles that of ACL injury. 相似文献
42.
Amanda P. Silvatti Karine J. Sarro Pietro Cerveri Guido Baroni Ricardo M. L. Barros 《Journal of sports sciences》2013,31(14):1551-1560
Abstract The purpose of this paper was to understand which differences long-term swimming training can cause on trunk mechanics during breathing and how these differences are related to the years of swimming training. The variations and coordination among trunk compartments were considered as target movement patterns. Video-based plethysmography was utilised for data acquisition and pre-processing. A group of swimmers, who followed a long-term intensive swimming training previously to this study, was compared with a non-swimmer control group. The participants of both groups performed quiet breathing and vital capacity tests. From the compartmental volumes associated with each breathing curves, the relative amplitude and cross-correlation among these volumetric time-varying signals were calculated, in order to analyse the relative partial volume variation and the coordination among trunk compartments involved in respiration. The results of a Mixed-ANOVA test (P ≤ 0.05) revealed higher coefficient of variation (P < 0.001) and correlations among trunk compartments in the swimmers group when vital capacity was performed. Significant linear regression was found between the years of swim training and the coefficients of variation and correlation. The results suggest that after long periods of intensive swim training, athletes might develop specific breathing patterns featuring higher volume variations in the abdominal region and more coordination among compartments involved in forced respiratory tasks such as vital capacity. 相似文献
43.
Jason Wicke David W. Keeley Gretchen D. Oliver 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(4):315-323
Coaches teach proper mechanics at a young age in an effort to increase pitching efficiency (i.e., proper pitching mechanics). Unfortunately, the mechanics taught to beginning pitchers are based on the findings from adult pitchers and may result in techniques that are detrimental to younger pitchers. The purpose of this study was to compare kinematics published for pitchers across various ages in an effort to determine whether the pitching techniques vary across developmental periods. A meta-analysis of papers published describing pitching kinematics for youth and adult pitchers was conducted. Maximal rotational velocity of the trunk and maximum external rotation of the shoulder were observed during the arm cocking phase. Peak magnitudes for abduction, horizontal adduction, and shoulder internal rotation were observed during the deceleration phase of the movement. In addition, by comparing previously published data across youth and adult pitchers, valuable insight into the differences in mechanics was gained. The results demonstrated that there are some distinct differences between youth and adult pitching mechanics. This finding may allow increased focus to be applied to those parameters observed to differ across age, increasing the knowledge base available for coaches to properly instruct youth pitchers. 相似文献
44.
孙心坚 《新疆教育学院学报》2010,26(4):102-104
为了英语学习者在英语阅读中能够更好地理解原文,文章从英语的句法功能：名词性从句、形容词性从句以及状语从句三个方面阐述了如何通过分析句子结构来理解英语的长难句。 相似文献
45.
体育的概念、术语、定义之解说立论 总被引：7，自引：1，他引：6
张洪潭 《西安体育学院学报》2006,23(4):1-6
体育概念的属性是人的肢体活动,其种差是强化体能和非生产性。体育一词本身就是最具涵盖性且最适宜的专用术语,而身体教育一词则是蹩脚的汉语。体育的定义应是,旨在强化体能的非生产性肢体活动。 相似文献
46.
张凤铸 《南京师范大学文学院学报》2005,(1):38-43
中国影视艺术既要借鉴“西洋”，也要讲“固本”。“固本”是强化根本，强化民族的优良传统，强化影视化的民族之魂。 相似文献
47.
杨志国 《河北能源职业技术学院学报》2006,6(3):82-83
在企业中,很多部门的员工并不是集中办公,他们分布在不同的楼层或地域,做为网络用户,他们需要集中管理;也有很多部门在网络上需要越来越高的安全性,不能和其他的部门混用同一个以太网段,以防止数据窃听.这些新问题需要更灵活地配置局域网,虚拟局域网技术解决了这个问题,用户不受地理位置的限制,在逻辑上组成新的局域网,缩小了广播域,提高了网络安全性. 相似文献
48.
当两种不同的表现类型需要寻找共通的训练方法与手的时候，剖析、阐明其不同点和共同点就显得尤其重要。肢体语言的具体化需要内在的情感的支撑，而支配肢体的内心具体性、丰富性则更不可或缺。建立信念感，使情感扩张和延伸外部体现与肢体语言。 相似文献
49.
对我国男子110 m栏的跑跨与跨跑技术的运动学分析 总被引：12，自引：1，他引：11
用国产春风牌高速摄影机以 96 fps的速度拍摄了 8运会男子 110 m栏预赛前 6名运动员跨越第 6栏时的技术动作 ,再用 JTK- 1型影片解析系统对冲印后的影片进行逐格分析。结果表明 :跑栏概念的实质是跑跨与跨跑能力的有机构成 ,运动员上栏前的 1步与过栏后的 1步所表现出的速度节奏是衡量跨栏技术优劣的关键所在。 相似文献
50.
摘要：目的：比较以同一步速3种步频行走时乳房不同支撑状态对人体姿态和乳房运动学参数的影响,为女性运动及运动文胸设计与选择提供建议参考。方法：12名C罩杯女性分别在穿着运动文胸或裸胸状态以3种步频在跑步机上行走,使用红外光点运动捕捉系统（200 HZ）采集躯干姿态和乳房的运动学参数。结果：穿着运动文胸状态躯干屈曲角幅度（P=0.042）、躯干扭转角（P=0.015）幅度和乳房各点位移（P<0.001）、速度（P<0.001）显著小于裸胸状态。步频显著影响躯干屈曲角及扭转角的运动范围（P＜0.05）,慢步频的乳房各点位移幅度较正常步频及快步频大（P＜0.05）,快步频的垂直方向速度变化明显较其他两步频大（P＜0.05）。回归分析表明躯干扭转角与乳房下点左右方向位移幅度正相关,躯干屈曲角运动幅度与乳房内点垂直方向位移幅度正相关。结论：乳房不同支撑状态影响乳房运动位移,乳房位移幅度会影响躯干运动范围。相同速度不同步频运动时,慢步频的躯干运动幅度和乳房位移幅度最大,快步频乳房各点垂直方向速度较大。 相似文献