The acute effects of vibration training on balance and stability amongst soccer players     

Ross Cloak  Alan Nevill  Matthew Wyon 《European Journal of Sport Science》2016,16(1):20-26

Acute whole body vibration training (WBVT) is a tool used amongst coaches to improve performance prior to activity. Its effects on other fitness components, such as balance and stability, along with how different populations respond are less well understood. The aim of the current research is to determine the effect of acute WBVT on balance and stability amongst elite and amateur soccer players. Forty-four healthy male soccer players (22 elite and 22 amateur) were assigned to a treatment or control group. The intervention group then performed 3 × 60 seconds static squat on vibration platform at 40 Hz (±4 mm) with Y balance test (YBT) scores and dynamic postural stability index (DPSI) measured pre and post. DPSI was significantly lower in the elite players in the acute WBVT compared to amateur players (F_{1, 40}= 6.80; P = 0.013). YBT anterior reach distance showed a significant improvement in both amateur and elite players in the acute WBVT group (F_{1, 40}= 32.36; P < 0.001). The improvement in DPSI amongst the elite players indicates a difference in responses to acute high frequency vibration between elite and amateur players during a landing stability task. The results indicate that acute WBVT improves anterior YBT reach distances through a possible improvement in flexibility amongst both elite and amateur players. In conclusion, acute WBVT training appears to improve stability amongst elite soccer players in comparison to amateur players, the exact reasoning behind this difference requires further investigation.  相似文献   

Three-dimensional analysis of a lofted instep kick by male and female footballers     

Tina Smith  Wendy Gilleard 《European Journal of Sport Science》2016,16(1):57-64

There is a paucity of data describing the lofted instep kick and little information on the kinematic differences between male and female footballers. This study provides a preliminary investigation into the differences in motion patterns between the sexes. A four-camera motion analysis system videoed 13 amateur footballers (7 female and 6 male) attempting a standardised task that represented a lofted instep kick of approximately 35 m. Footballers performed 20 kicks, with the three trials categorised closest to the standardised distance retained for statistical analysis. Three-dimensional motion patterns for kicks of 35 m illustrated that female footballers produced greater fluctuation in movement patterns for pelvic, hip joint and thoracolumbar spine motion in the frontal plane; thorax and hip joint transverse rotation; and ankle dorsiflexion/plantarflexion motion. Peak hip extension (P = 0.018), impact hip abduction (P = 0.032), impact ankle plantar flexion (P = 0.030) and resultant ball velocity (P = 0.004) differed significantly between sexes. Principle component analysis highlighted associations between kinematic variables related to ball velocity and sex including a reduced hip abduction and increased internal rotation approaching impact, and greater peak knee flexion, respectively. In summary, increased variation in direction of segment motion, increased backswing and formation of a tension arc by females compared to males, may be related to anthropometric, strength and muscle activation differences. Specifically, this exploratory study indicates future research would benefit from exploring trunk, pelvis and hip kinematics and kinetics, and whether training the trunk, pelvis and hip musculature assists female footballers.  相似文献   

湘鄂渝黔边区旅游环境保护的博弈分析   总被引：6，自引：0，他引：6  

陈国生 《衡阳师范学院学报》2003,24(4):79-84

旅游资源保护问题已经成为近期旅游界的一个热点。旅游环境保护的有效性，在一个区域内主要取决于政府和旅游企业双方博弈的力量及环境政策的调整程度。在湘鄂渝黔边区旅游开发中，为了更有效地培植良好的环境保护，应建立起合理、有效的政府调节与市场调节相结合的环境保护机制。  相似文献   

略论钢琴演奏中的节奏     

孙冬梅 《辽宁高职学报》2006,8(1):132-133

音乐节奏是指音响的强弱快慢。在钢琴教学及演奏中,要注意正规节奏与不正规节奏、强起拍与弱起拍、切分音与连结线、三连音及各种连音符等节奏的变化。  相似文献   

Full Steam Ahead: A Conceptual Analysis of User-Supplied Tags on Steam     

Travis W. Windleharth  Jacob Jett  Marc Schmalz  Jin Ha Lee 《Cataloging & classification quarterly》2016,54(7):418-441

This article describes a conceptual analysis of user-generated tags applied to video games in the Steam video game distribution system. The research team scraped all user-generated tags available on Steam and then conducted a conceptual analysis of the tags, sorting them into categories and comparing them to the current version of the Video Game Metadata Schema. This analysis allowed the team to identify new metadata elements and terms useful to game players. We present a discussion covering the major issues in organizing the terms, as well as the implications for the future work in the area of video game metadata.  相似文献   

净化考试环境防治高考舞弊的博弈分析     

李小艳 《平原大学学报》2006,23(1):22-25

高考舞弊除了学生自己的原因外,还与考试环境密不可分。从经济主体的利益出发,运用博弈论的模型和方法,构建了两者博弈模型,对博弈方的行为策略与利益得失进行分析,并提出了净化考试环境,防治高考舞弊的对策建议。  相似文献   

Effects on muscle strength,maximal jump height,flexibility and postural sway after soccer and Zumba exercise among female hospital employees: a 9-month randomised controlled trial     

Svein Barene  Andreas Holtermann  Harald Oseland  Ole-Lars Brekke  Peter Krustrup 《Journal of sports sciences》2016,34(19):1849-1858

This 9-month randomised controlled workplace physical activity trial investigated the effects of soccer and Zumba exercise, respectively, on muscle strength, maximal jump height, sit-and-reach flexibility and postural sway among female workers. A total of 107 female hospital employees aged 25–63 were cluster-randomised to a soccer group, a Zumba group or a control group. Training was conducted outside working hours as two to three 1-h weekly sessions the first 3 months and once a week the last 6 months. Tests were conducted at baseline, after 3 and 9 months. The soccer group improved maximal neck extension strength both after 3 (1.2 kg; P < 0.05) and 9 months (1.7 kg; P < 0.01) compared to the control group. The Zumba group improved maximal trunk extension strength (3.1 kg; P = 0.04) after 3 months, with improvements in postural sway velocity moment (?9.2 mm²/s; P < 0.05) and lower limb lean mass (0.4 kg; P < 0.05) after 9 months. No significant intervention effects were revealed in vertical jump height or sit-and-reach flexibility. The present study indicates that workplace-initiated soccer and Zumba exercise may be beneficial for improvement of the neck and trunk strength, which may have preventive effects with regard to future perceived muscle pain in the respective body regions. Furthermore, the Zumba group revealed positive effects on lower limb lean mass and postural sway compared to the control group.  相似文献   

职业足球、社会足球和校园足球的关系研究     

张鲲  翟玉欣 《湖北体育科技》2016,(6):471-473

采用文献资料法、逻辑分析法讨论职业足球、社会足球和校园足球的关系。认为:校园足球不仅可以为职业足球培养后备人才,还能丰富社会足球的人员组成结构;职业足球可以为社会足球和校园足球提供相应的指导;社会足球可以营造"足球热"气氛,使更多的人参与进来,扩大足球人口;促进足球产业发展,繁荣足球市场,为职业足球更好的发展提供了基础,并扩展校园足球的发展空间。  相似文献   

进化博弈理论方法与房地产市场诚信问题研究     

张良桥 《顺德职业技术学院学报》2005,3(2):51-54,58

首先介绍进化博弈理论的基本均衡概念与基本动态概念,然后设计一个简单的进化博弈理论模型来研究房地产市场诚信形成的过程及其影响因素,在此基础上提出了以动态管理的思想从系统出发来规范房地产信用市场的发展.  相似文献   

进化博弈:理论与方法     

张良桥 《顺德职业技术学院学报》2007,5(3):37-42

进化博弈理论产生于20世纪80年代,是生态学理论与非合作博弈理论的完善结合,近十几年来倍受经济学、社会学与生态学理论界的重视,目前国内还没有全面、系统地阐述该理论的相关文献。该文以突变与选择两大机制为主线,系统地论述进化稳定策略与模仿者动态,在此基础上概述学者们的最新研究成果。  相似文献