Reliability of force-velocity parameters obtained from linear and curvilinear regressions for the bench press and squat exercises

ABSTRACT

This study aimed to compare the goodness of fit and the reliability of different regression models for fitting the force-velocity relationship (FV) of bench press (BP) and squat (SQ). Additionally, the reliability of the position on FV of the velocity (V_1RM) and the force performed with the 1RM (F_1RM) was explored. Nine rugby players and 12 judokas participated in this study. The FV of BP and SQ were obtained twice by a protocol performed until the 1RM. Individual FV were fitted by linear (LM), quadratic polynomial (PM), and exponential models (EM). Adjusted coefficients of determination of LM and PM (medians higher than 0.919) were higher than for EM. The reliability was higher for LM in comparison with PM. The reliability of V_1RM was not acceptable (CV% = 19 and 18% for BP and SQ). High reliability was observed for F_1RM (CV% = 3 and 2% for BP and SQ) and for the ratio between F_1RM and the force-axis intercept of FV (CV% = 2 and 4% for BP and SQ). The reliability of the relative values of F_1RM around 92 and 87% of F₀ for BP and SQ suggests the use of these values for monitoring resistance training programmes.     

The acute effects of resistance exercise on affect,anxiety, and mood – practical implications for designing resistance training programs

ABSTRACT

Research in aerobic exercise has linked the affective responses (pleasure–displeasure) experienced during exercise to future exercise participation. While this is yet to be confirmed in anaerobic activities, it can be inferred that making resistance exercise (RE) more psychologically rewarding is an important consideration. The purpose of this article is to review the acute effects of RE on affect, anxiety, and mood and to draw conclusions on how to maximize feelings of pleasure in an effort to increase rates of participation. This review provides evidence to support lower training volumes performed at low to moderate intensities (50–70% 1RM) with long inter-set rest intervals (90–150 s). Additional recommendations are provided based on physiological and theoretical support, but there is a strong need for more research on the affective experience of RE.     

版权保护指标体系构建及强度测定

构建一个版权保护强度指标体系,并对版权保护强度进行客观的测量,不仅是经济学研究的基础,也是对各类理论模型加以验证的前提条件,更为重要的是,可以借此进行版权保护强度的国际比较。本研究遵循版权保护强度应是立法强度与执法强度综合的原则,构建了由2个一级指标、12个二级指标以及55个三级指标组成的版权保护指标体系。在此基础之上,计算了1991至2008年中国版权保护强度、2005年中国各地区版权保护强度和2008年58个国家和地区的版权保护强度。     

C60-C80高性能商品混凝土的配制与应用

高性能混凝土(High Performance Concrete,HPC)是指具有高强度、高耐久性、高流动性等多方面优越性能的混凝土,是在大幅度提高普通混凝土性能的基础上采用现代混凝土技术制作的混凝土,它以耐久性作为设计的主要指标,针对不同用途要求,保证混凝土的适用性和强度并达到高耐久性、高工作性、高体积稳定性和经济性。因此被认为是目前全世界性能最为全面的混凝土,至今已在不少重要工程中被采用,特别是在桥梁、高层建筑、等工程。对于C60—C80级高性能混凝土的试验研究,该课题立足于采用广西当地的原材料、外加剂和矿物掺合料。采用双掺技术及常规生产工艺,经过实验、对比,证实了利用本地原材料配制HPC是可行的。注重技术的实用性,以利于尽快转化为生产力。     

举重运动员等动肌力特征的分析与研究

本研究利用CYBEX-6000型测力系统,对国家举重队和广东省举重队部分运动员的等动肌力特征进行分析和研究,综合归纳出举重运动员等动肌力的总体规律特征,提出针对性的建议.     

某立交桥混凝土连续梁C50混凝土配合比设计

C50混凝土广泛运用于桥梁的上部结构中,由于混凝土配合比设计不合理,往往引起混凝土强度不合格、收缩裂缝等问题发生.某立交桥连续梁所需C50混凝土要求非常高,根据大量的试验以及成功的生产经验,阐述了C50混凝土的原材料选择以及配合比设计.     

海南现代服务业发展面临的机遇和挑战——用SWOT方法分析

随着国际旅游岛建设上升为国家战略,海南现代服务业迎来了前所未有的机遇和挑战,目前海南现代服务业发展水平低,发展不充分。用SWOT方法分析海南现代服务业面临的机遇和挑战,找出其内部优势和劣势,分析其外部机遇和挑战,绘制了海南发展现代服务业的SWOT矩阵战略模式,并具体分析了海南发展现代服务业的战略选择和战略思路。     

Standing on the shoulders of giants?—Faculty hiring in information schools

The past three decades have witnessed the tremendous growth of the number of information schools (a.k.a., iSchools) and the size of their faculty bodies. However, there is little empirical evidence in faculty hiring patterns within the community. Analyzing hand-curated data of 81 junior and 485 senior faculty members from 27 iSchools in the United States and a total of 41?981 journal and conference proceeding publications, we investigate the effects of collaboration experience on placement quality, controlling for other well studied factors including gender, scholarly performance, and prestige of degree-granting programs. In particular, we find that strong ties in collaboration, as measured by PhD advisors’ academic achievements, have little correlation with placement quality fixing other factors. On the other hand, weak ties, manifested by coauthors excluding advisors, are found to be beneficial. Providing a better understanding of hiring practice in iSchools, the results highlight the importance of “standing on the shoulders of giants” for junior information science researchers wishing to find high-quality faculty job. Finally, our findings lay the foundation for future investigations, where stakeholders and administrators can assess the effectiveness of existing hiring strategies, which in turn provide managerial and policy implications for iSchools to adapt to the fast growing landscape of information science.     

国外力量训练学术研究百年发展历程的情报学解读--基于Web of Science的数据

运用文献资料调研、数理统计、专家咨询、聚类分析等研究方法,对国外力量训练学术研究领域百年发展历程进行了阶段划分,并对领域发展做出卓越贡献的国家/地区、研究机构、作者、来源出版物、资助基金、学科等要素的分布特征及变化规律进行了分析,识别出了肌肉肥大与力量增长的生理生化基础、抗阻力量训练与内分泌激素的关系、抗阻力量训练中的物质补充、抗阻力量训练与骨骼肌蛋白质代谢的关系、抗阻力量训练对身体成分及骨矿密度的影响、不同肌肉工作方式对力量训练效果的影响以及不同人群(包括各类疾病患者)的力量训练问题研究等7个领域研究的重要主题。     

高校网球运动员力量训练突破的途径与方法

结合训练实践经验、文献和理论思考,针对目前我国高校网球运动员专项力量水平不足这一现象,提出了适合我国高校网球运动员网球专项力量训练突破的途径与方向和方法;讨论分析了核心力量训练对高校网球运动员的作用、价值与方法。