摘要
生物力学模型在运动分析中具有重要作用.目前,一些常用的传统模型带有有棒标识,可能在运动中产生振动,引起误差.本文提出一种下肢无棒标识模型,可以计算下肢关节的角度、力、力矩和功.为了验证新模型,22个健康成人参加了试验,分别应用新模型和传统模型分析了他们的步行和跑步标识数据,计算并比较了其下肢的踝、膝、髋关节的角度、力、力矩和功.基于所有参数曲线,误差分析结果显示:高频振动引起的误差在传统模型中比在新模型中大一倍.可靠性分析显示:新模型的内联相关系数在步行和跑步中分别达到0.934和0.960,而传统模型分别只有0.737和0.916.结果表明新模型比传统的有棒标识模型在减少误差和提高可靠性方面均有改善.新的无棒标识下肢生物力学模型可以取代传统有棒标识下肢模型,用于医疗步态和跑步的运动分析.
Biomechanical models play an important role in motion analysis. Some models routinely used in motion analysis have wand-markers and may bring about errors due to vibrations during movement. This study proposed a lower limb model without using wand-markers which can calculate joint angle, force, moment and power. Twenty-two healthy subjects participated in this study. The proposed model was compared with a traditional model which has wand-markers and is widely used in many clinical gait laboratories in processing running and walking data. Kinematical and kinetic parameters for the hip, knee and ankle were obtained using both models. The results show that the errors produced by high frequency of vibration between the filtered and the raw data from the proposed model are approximately half of those from the traditional model. The analysis of reliability shows that intra-elass correlation coefficients are 0. 934 and 0. 960 in running and walking, respectively, using the proposed model while these coefficients are 0. 737 and 0. 916 using the traditional one. The results indicate that being wand-marker free makes the proposed model of better quality in the calculation of kinetic and kinematical parameters than the traditional model. The proposed model could be considered as an improved alternative for the traditional ones in motion analysis of clinical gait and running.
出处
《纳米技术与精密工程》
CAS
CSCD
北大核心
2015年第5期383-390,共8页
Nanotechnology and Precision Engineering
基金
英国文化学会和巴基斯坦高等教育委员会的英巴知识经济伙伴基金资助项目(KEP-058)
英国爱丁堡皇家学会和中国国家自然科学基金联合资助项目
西班牙科学与创新部基金资助项目(CGL2010-20868)
关键词
生物力学模型
可靠性
误差分析
下肢关节
步行
跑步
biomechanical model
reliability
error analysis
lower limb joints
walking
running
