Resultant muscle torque and electromyographic activity during high intensity elastic resistance and free weight exercises

Abstract

The purpose of this study was to quantify and compare Resultant Muscle Torque (RMT) and muscle activation (EMG) pattern, during resistance exercise comprising eight repetitions maximum (8 RM) biceps curl with elastic resistance and free weight exercise. Sixteen male and female recreationally active subjects completed 8 RM biceps curl by each of three modalities of resistance exercise: (i) dumbbell (DB), (ii) elastic tubing with original un-stretched length at the commencement of contraction (E0), and (iii) elastic tubing with 30% decrement of original length (E30) at the commencement of contraction. The magnitude of muscle activation, external force, acceleration as well as range of motion (ROM) were quantified and synchronised by specific software. The data were collected from all eight repetitions but the first (initial), the fifth (middle) and the eighth (last) repetitions were selected for further data analysis. Each selected repetition was partitioned into a concentric and eccentric phase and then each phase was further divided into three equal segments (3 concentric and 3 eccentric = 6 segments per repetition). The EMG and RMT data demonstrated a bell-shaped muscle activation and muscle torque production pattern for the three modes of exercise. The E30 resulted in 15.40% and 14.89% higher total EMG (µV) as well as 36.85% and 17.71% higher RMT (N · m) than E0 and DB, respectively (all P <0.05). These findings support the contention that an elastic resistance device (E30) has the capacity to provide an appropriate high resistance stimulus to meet the training requirement of elite athletes.     

关于体育健身和生命质量研究的视角、理论与方法

准确把握生命质量的内涵、实质和恰当的“视角”是体育领域开展生命质量研究的根本。为此,本研究运用文献资料、逻辑分析等方法梳理和分析了生命质量研究的产生根源、理论形成背景、研究视角、方法等历史发展轨迹,并从中发现提升体育生命质量是生命质量研究的根本目标;健身锻炼、体育重大事件、体育生活方式、体育社会参与等是体育研究生命质量可以借鉴的理论和视角;实验干预、优化技术等应用性方法是体育研究生命质量可以采用的前沿方法。     

Energy Cost of Rebound-Running

Using Sonstroem, Harlow, and Josephs' (1994) expanded version of the Exercise and Self-Esteem Model (EXSEM; Sonstroem &; Morgan, 1989), we explored how 9 older adults (6 women and 3 men, aged 65–72 years) involved in a resistance training program experienced and perceived changes in physical self-worth (i.e., improved strength, functional competency, physical condition, and body satisfaction). We conducted three in-depth interviews with each participant over the course of the program. In individual log books, participants recorded the weight lifted and the number of repetitions for each exercise. Our findings showed the course of changes in physical self-perceptions in these older adults and how actual individual changes in strength performance related to perceived changes in important psychological outcomes.     

贵州省普通高校硕士研究生参加体育锻炼的现状与分析

研究生是受教育程度最高的社会群体,是我国21世纪社会主义现代化建设的骨干人才,肩负着实现中华民族伟大复兴的重要历史使命。当前,研究生的健康问题遇到了许多新的挑战。本文采用文献资料法、访谈法、问卷调查法、逻辑分析法等方法,对贵州省普通高校硕士研究生体育锻炼现状进行调查研究,旨在全面了解贵州省普通高校硕士研究生体育锻炼现状,以便为西南地区高校体育组织和管理部门加强研究生体育锻炼提供一些理论参考和现实依据。     

影响大学生体育锻炼的心理因素

体育锻炼行为受多种因素影响,但心理因素是影响其锻炼行为的重要因素。心理因素包括体育兴趣、体育动机、体育态度等。这些都在不同程度上影响着学生的体育锻炼行为。     

我国体育人口活动项目的参与率对大学公共体育课教学改革的指导意义

长期以来，我国学校体育与社会体育相互脱节，本文通过我国体育人口活动项目的参与率来指导大学公共体育课程改革，探讨通过公共体育课教学改革，重点教会大学生羽毛球、乒乓球、体育舞蹈、篮排足球等在我国较有群众基础的一两项运动技术技能，进而培养学生形成终生体育思想的思路和方法．     

车轮跑在110m栏辅助练习中的运用研究

根据车轮跑练习与110m跨栏跑的技术比较,两者在极限性、爆发性发力以及髋关节为轴的高速摆动都有很大的相似性,建议把车轮跑划入110m跨栏跑的辅助性练习中,并应贯穿于整个训练的始终。     

浅析《数学分析》习题课的教育功能

数学分析习题课的教学不仅要巧选习题,而且要在课堂中体现出数学的独特教育功能,即培养学生科学的思维能力,从而把习题课变成师生共同探索、共同提高、共同审美的过程。     

在体育教学中培养大学生体育锻炼主观能动性的途径

对学生在体育锻炼中产生主观能动性因素进行分析,指出体育教学中体育锻炼主观能动性培养的几种重要途径,强调主观能动性培养在体育教学中应考虑的几点关键性问题,明确主观能动性是学生刻苦学习、积极锻炼不竭的动力源泉,对提高教学质量、增强学生体质、促进学生智力发展都具有显著作用.     

Developing Critical Thinking Skills For Information Seeking Success

Critical thinking skills are required to successfully navigate the overwhelming amount of information sources available today. To address the challenge of developing critical thinking skills, this empirical study examines the effectiveness of exercises in developing thinking skills in college freshmen students. The workbook exercises were designed to develop specific skills related to academics and critical thinking. Two groups of college freshmen participated in the study: one group was given the workbook, the other group was not. At the end of the semester, both groups completed a critical thinking assessment test. A comparison of the test scores confirms the effectiveness of these exercises on improving the critical thinking skills of college freshmen.