Caution: The use of an electromagnetic device to measure trunk kinematics on rowing ergometers     

Leo Ng  Angus Burnett  Amity Campbell  Peter O'Sullivan 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(3):255-259

The aim of the study was to determine the accuracy and variability of an electromagnetic device in measuring spinal kinematics on a traditional and replica rowing ergometer. Kinematic data collected from the 3-Space Fastrak^TM system using a Standard Concept II ergometer were compared with a replica ergometer that was in part, composed of non-ferrous materials (modified ergometer). The Fastrak's sensors were fixed to a wooden “spine” with known angles (as measured by an inclinometer). The mean inclinometer angle from four sensors (1 ± 0.2°) was significantly different than the mean angle recorded on the standard ergometer ( ? 5.4 ± 3.4°) (p = 0.007) whilst the angles recorded on the modified ergometer (1.4 ± 0.8°) were statistically equivalent to the inclinometer recordings (p = 0.660). These results indicate that the presence of ferrous material in a standard ergometer reduced the accuracy and increased the variability of data collected with the electromagnetic device. However, information collected on largely non-ferrous ergometers can provide coaches, biomechanists and clinicians with a quick and effective way to measure trunk kinematics during ergometer rowing.  相似文献   

石家庄市区道路慢行系统问题分析及治理     

杜玉林  牛学勤 《石家庄铁路工程职业技术学院学报》2006,(1)

数量庞大的慢行交通是我国城市交通规划的难点。对慢行交通特性及石家庄市交通问题进行分析,提出优化道路等级配置,均衡交通分布,协调公交与慢行交通关系等解决交通问题的对策。  相似文献   

Analysis and comparison of safety and fatigue comfort of postal bicycles based on finite element method and sEMG     

项忠霞  李亚南  田冠  常振元 《天津大学学报(英文版)》2013,19(4):272-278

The safety and the fatigue comfort were compared between a domestic and a Japanese postal bicycle. Firstly, the fatigue comfort of these two kinds of bicycles was evaluated by surface electromyographic signal (sEMG) experiment, in which human lower limb muscle groups were research objects, and the average EMG (AEMG) index and median frequency (MF) were chosen as the evaluation indexes. Secondly, the safety of these two kinds of bicycle frames was analyzed and compared by using the finite element analysis. The results show that the riding fatigue comfort of the Japanese postal bicycle is better, and the Japanese postal bicycle frame is more safe and reasonable although both the postal bicycles meet the requirement for strength. Finally, based on the above analysis, the frame structure and related parameters of the domestic postal bicycle were improved with reference to the Japanese postal bicycle and biomechanics theory.  相似文献   

多用途集装箱公共自行车存取车库的设计     

李由  沈晶晶  胡佩  吴晓璐  李帆  刘梦瑶  徐紫奔  张恒 《台州学院学报》2013,(6):45-49,55

通过分析公共自行车和集装箱尺寸以及多项用途所需要的使用空间,论证了集装箱改造的小型建筑能运用于公共自行车存取车库和公交站点等多项用途的可行性.并在此分析基础上提供了几种集装箱公共自行车存取车库的平面布置,以及其立面、顶面形式和外观造型、色彩设计方案.为集装箱运用于多用途公共自行车存取车库提供了一种有效解决方案和新颖设计.  相似文献   

我国残疾自行车运动员自尊、特质焦虑测查报告   总被引：4，自引：0，他引：4  

房蕊 《天津体育学院学报》2006,21(2):157-160

采用自尊量表（SES）及特质焦虑量表（TAI）对参加2005年全国残疾人自行车锦标赛的98名参赛队员的自尊、特质焦虑进行测查，对数据进行T检验、多因素方差分析、单因素方差分析、多重比较分析及Pearson相关分析，从大众健身和竞技运动两个不同的视角，对可能的原因进行探析。结果表明：我国残疾自行车运动员自尊总体水平偏高，参训时间短的新队员的自尊尤其高；特质焦虑总体水平与正常人无显著性差异；参训时间与特质焦虑存在显著性正相关；性别特征、残疾类别特征对其自尊、特质焦虑均无显著性影响。主效应不显著，交互作用也不显著；年龄、参训时间与自尊的相差均无显著性，年龄与特质焦虑的相差无显著性；自尊与特质焦虑存在显著性负相关。  相似文献   

Comparison of physiological responses to graded exercise test performance in outrigger canoeing     

Rebecca M. Kerr  Warwick Spinks  Anthony S. Leicht  Wade Sinclair  Louise Woodside 《Journal of sports sciences》2013,31(7):743-749

Abstract

The aim of this study was to establish a graded exercise test protocol for determining the peak physiological responses of female outrigger canoeists. Seventeen trained female outrigger canoeists completed two outrigger ergometer graded exercise test protocols in random order: (1) 25 W power output for 2 min increasing by 7.5 W every minute until exhaustion; and (2) 25 W power output for 2 min increasing by 15 W every 2 min to exhaustion. Heart rate and power output were recorded every 15 s. Expired air was collected continuously and sampled for analysis at 15-s intervals, while blood lactate concentration was measured immediately after and 3, 5, and 7 min after exercise. The peak physiological and performance variables examined included peak oxygen uptake ([Vdot]O_2peak), minute ventilation, tidal volume, ventilatory thresholds 1 and 2, respiratory rate, respiratory exchange ratio, heart rate, blood lactate concentration, power output, performance time, and time to [Vdot]O_2peak. There were no significant differences in peak physiological responses, ventilatory thresholds or performance variables between the two graded exercise test protocols. Despite no significant differences between protocols, due to the large limits of agreement evident between protocols for the peak physiological responses, it is recommended that the same protocol be used for all comparison testing to minimize intra-individual variability of results.  相似文献   

Three-dimensional joint dynamics and energy expenditure during the execution of a judo throwing technique (Morote Seoï Nage)     

Laurent Blais  Patrick Lacouture 《Journal of sports sciences》2013,31(11):1211-1220

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社会文化视角下的百年环法          下载免费PDF全文

尹晓峰  杨圣韬 《体育科研》2010,31(3):69-74

作为公路自行车运动界一项最重要的赛事,环法自行车赛（Tour of France）经过了百年历史长河的洗礼。在对有关环法的传记和文献进行梳理和回顾的基础上,为环法的起源和发展绘制一个时空坐标系,从社会文化的视角审视内外部多重参数影响下的环法轨迹。  相似文献   

Comparison of ergometer- and track-based testing in junior track-sprint cyclists. Implications for talent identification and development     

Paul J. Tofari  Stuart J. Cormack  Tammie R. Ebert  A. Scott Gardner  Justin G. Kemp 《Journal of sports sciences》2017,35(19):1947-1953

Talent identification (TID) and talent development (TDE) programmes in track sprint cycling use ergometer- and track-based tests to select junior athletes and assess their development. The purpose of this study was to assess which tests are best at monitoring TID and TDE. Ten male participants (16.2 ± 1.1 year; 178.5 ± 6.0 cm and 73.6 ± 7.6 kg) were selected into the national TID squad based on initial testing. These tests consisted of two 6-s maximal sprints on a custom-built ergometer and 4 maximal track-based tests (2 rolling and 2 standing starts) using 2 gear ratios. Magnitude-based inferences and correlation coefficients assessed changes following a 3-month TDE programme. Training elicited meaningful improvements (80–100% likely) in all ergometer parameters. The standing and rolling small gear, track-based effort times were likely and very likely (3.2 ± 2.4% and 3.3 ± 1.9%, respectively) improved by training. Stronger correlations between ergometer- and track-based measures were very likely following training. Ergometer-based testing provides a more sensitive tool than track-based testing to monitor changes in neuromuscular function during the early stages of TDE. However, track-based testing can indicate skill-based improvements in performance when interpreted with ergometer testing. In combination, these tests provide information on overall talent development.  相似文献   

自行车运动两人跟骑的空气阻力研究   总被引：5，自引：0，他引：5  

金丽颖 《中国体育科技》1998,(10)

本文通过人、车实体风洞试验,测试两人跟骑空气阻力随风速、距离和侧面迎风跟骑的阻力变化,目的在于了解自行车运动员在骑行中不同骑行姿势的空气阻力变化情况,为自行车运动训练和比赛提供科学的参考依据。  相似文献