| 次最大强度下改变坐角对自行车骑行影响的动力学特征分析 |
| |
| 引用本文： | 吴建逊,罗炯.次最大强度下改变坐角对自行车骑行影响的动力学特征分析[J].天津体育学院学报,2008,23(3):251-254. |
| |
| 作者姓名： | 吴建逊 罗炯 |
| |
| 作者单位： | 1. 广东韶关学院体育学院,广东,512005
2. 西南大学体育学院,重庆,400715 |
| |
| 摘 要： | 改变坐角显著影响脚蹬切向力、有效力及作用效率的大小.随着坐角的增加,脚蹬切向力显著下降,有效力及效率指数明显提高,同时切向力、法向力及有效力峰值随坐角的增加明显延迟;存在两种踏蹬模式,一类主要采用增大切向力减小法向力的方式去增加合力,另一类则相反;实验确证了恢复阶段存有两个驱动时相,其中一个产生负效率,另一个产生正效率,但从正负驱动的总效应来看是负的占优,即恢复阶段要真正产生正的驱动效果很困难;不同坐角条件下的平均作用效率、踏蹬过程中左右两腿用力是否均匀是衡量自行车运动踏蹬技术优劣的重要指标.
|
| 关 键 词： | 次最大强度 坐角 踏蹬效率 大强度 自行车 骑行 影响 动力学 特征分析 Intensity Angles Different Efficiency Characteristic 指标 踏蹬技术 运动 均匀 过程 条件 驱动效果 总效应 负效率 |
Kinetic Characteristic of Bicycle Pedaling Efficiency among Different Seat Angles under Sub-maximal Intensity |
| |
| WU Jian-xun,LUO Jiong.Kinetic Characteristic of Bicycle Pedaling Efficiency among Different Seat Angles under Sub-maximal Intensity[J].Journal of Tianjin Institute of Physical Education,2008,23(3):251-254. |
| |
| Authors: | WU Jian-xun LUO Jiong |
| |
| Institution: | School of PE, Shaoguan Institute, Shaoguan 512005, China;School of PE, Southwest University, Chongqing 400715, China |
| |
| Abstract: | The change of the seat angle affects significantly the tangential force, the efficiency of the force, and action efficiency. As the seat angle increasing,the pedaling tangential force decreases evidently but the efficiency of the force and efficiency index improve obviously, tangential force, normal force,and efficiency force peak value decays under the seat angles increase. There are two modes of pedaling techniques, one method is to increase the resultant force by increasing tangential force and decreasing normal force, the other one by decreasing tangential force and increasing normal force. The experiment confirms that there are two drive phases during recovery phase, one generates the positive efficiency, and the other generates the negative efficiency. But the
total efficiency is negative, this means it is very difficult to generate positive drive efficiency during recovery phase. It is a major index to assess the pedaling techniques with the average force efficiency and the well- balance force between legs under different seat angles. |
| |
| Keywords: | sub-maximal intensity seat angle pedaling efficiency |
| 本文献已被 维普 万方数据 等数据库收录！ |
| 点击此处可从《天津体育学院学报》浏览原始摘要信息 |
| 点击此处可从《天津体育学院学报》下载免费的PDF全文 |
|
