Knee strength variability between individuals across ranges of motion and hip angles.
Knee strength variability between individuals across ranges of motion and hip angles.
复制标题
个体之间的膝部力量在运动范围和髋部角度方面存在差异。
DOI：
10.1097/00005768-200005000-00016
复制
发表时间：
2000
影响因子：
4.1
通讯作者：
Grabiner,MD
中科院分区：
文献类型：
--
作者：
Pavol,MJ;Grabiner,MD
目的等速肌力通常是针对一个单一的运动范围和身体位置进行测量。这项研究量化了个体之间的变异性，在一个单一的峰值膝关节伸展力矩和等速伸展力矩之间的关系，测量不同的髋关节角度和膝关节运动范围。髋关节角度的影响，和起始膝关节角度的运动范围，对等速膝关节伸展strengths.MethodsThe等速膝关节伸展强度的10名受试者进行了测量，在30度xs（-1）的膝关节屈曲角度为10度，从90，75，60，45，和30度，在坐着和仰卧位。从一个参考contraction.ResultsPeak力矩和力矩在较大的膝关节屈曲角度的峰值力矩进行归一化的时刻是在坐着比在仰卧位。起始膝关节角度影响峰值力矩、峰值力矩角度以及活动范围的初始和最终部分的力矩。峰值力矩在所有髋关节角度-起始膝关节角度组合之间高度相关。然而，归一化峰力矩，峰力矩的角度，和归一化的角度特定的时刻都有很大的变化之间的主题。受试者间标准化角度特异性矩的合并标准差和平均变异系数分别为标准化矩的10.5%和15.7%。排除参考收缩，受试者之间的变异性是不受髋关节角度或起始膝关节角度。ConclusionsInfluences髋关节角度，起始膝关节角度，和等速膝关节伸展强度的个体差异必须考虑，以确保从等速测试获得的时刻充分反映了个人的一般力量能力。
PurposeIsokinetic strength is normally measured for a single range of motion and body position. This study quantified the variability, between individuals, in the relationships between a single peak knee extension moment and the isokinetic extension moments measured for different hip angles and ranges of knee motion. Effects of hip angle, and of the starting knee angle of the range of motion, on isokinetic knee extension strength were also determined.MethodsThe isokinetic knee extension strength of 10 subjects was measured at 30 degrees xs (-1) to a knee flexion angle of 10 degrees from starting knee angles of 90, 75, 60, 45, and 30 degrees, in both the seated and supine positions. Moments were normalized to the peak moment from a reference contraction.ResultsPeak moments and moments at larger knee flexion angles were greater in the seated than in the supine position. The starting knee angle affected the peak moment, the angle of peak moment, and the moments over the initial and final portions of the range of motion. Peak moments were highly correlated between all hip angle-starting knee angle combinations. However, the normalized peak moments, the angles of peak moment, and the normalized angle-specific moments all varied considerably between subjects. The pooled standard deviation and average coefficient of variation of the normalized angle-specific moments between subjects were 10.5% of the normalizing moment and 15.7%, respectively. Excluding the reference contraction, between-subject variability was unaffected by hip angle or starting knee angle.ConclusionsInfluences of hip angle, starting knee angle, and individual differences on isokinetic knee extension strength must be considered to ensure that the moments obtained from isokinetic testing adequately reflect the general strength capabilities of an individual.