Kumar S, Dufresne R M, Van Schoor T
University of Alberta, Edmonton, Canada.
Spine (Phila Pa 1976). 1995 Jan 15;20(2):160-8. doi: 10.1097/00007632-199501150-00006.
Isometric and isokinetic trunk flexion-extension strengths were studied among 73 subjects (41 males and 32 females) and 10 patients (9 males and 1 female). The isometric strengths were measured in four postures of trunk flexion. The isokinetic trunk strengths were measured through the range of these postures.
The study had two objectives: to develop a database for isometric flexion-extension strength at different levels of trunk flexion and isokinetic strength at corresponding angles and to determine the decrement in strength characteristics among patients of idiopathic low back pain.
Though flexion-extension strength among normal subjects and patients has been studied, its variation due to standardized postural change has not been reported extensively. The influence of postural deviation on flexion-extension ratios are also largely unknown.
To achieve the objectives of the study, a device flexion-extension-lateral flexion tester (FELT) was designed and fabricated. The male and female subjects performed isometric flexion and extension at 0 degree, 20 degrees, 40 degrees and 60 degrees of trunk flexion; and isokinetic flexion starting at neutral posture, and isokinetic extension starting at 60 degrees of trunk flexion. The patients performed isometric flexion and extension in neutral posture only; and isokinetic flexion-extension similar to normal sample.
The average strength in each activity was between 70 and 80% of the corresponding peak strength. The isokinetic activity strengths ranged between 60 and 70% of the corresponding isometric activities in each group. The strength of females ranged between 60 and 70% of males. The ANOVA revealed that posture had a significant effect on strength. The multiple regression explained 73% of variance in isometric and 34% in isokinetic modes.
A patient's strength profile should be determined in a posture that simulates activities of daily living to determine impairment and plan rehabilitation.
对73名受试者（41名男性和32名女性）以及10名患者（9名男性和1名女性）的等长和等速躯干屈伸力量进行了研究。等长力量在躯干屈曲的四种姿势下进行测量。等速躯干力量在这些姿势范围内进行测量。
本研究有两个目的：建立一个关于不同躯干屈曲水平下等长屈伸力量以及相应角度下等速力量的数据库，并确定特发性腰痛患者力量特征的下降情况。
尽管已经对正常受试者和患者的屈伸力量进行了研究，但由于标准化姿势变化导致的力量变化尚未得到广泛报道。姿势偏差对等长屈伸比率的影响也大多未知。
为实现本研究的目的，设计并制造了一种屈伸-侧屈测试仪（FELT）。男性和女性受试者在躯干屈曲0度、20度、40度和60度时进行等长屈伸；从中立姿势开始进行等速屈曲，从躯干屈曲60度开始进行等速伸展。患者仅在中立姿势下进行等长屈伸；等速屈伸与正常样本相似。
每项活动的平均力量为相应峰值力量的70%至80%。每组中等速活动力量为相应等长活动力量的60%至70%。女性力量为男性的60%至70%。方差分析显示姿势对力量有显著影响。多元回归解释了等长模式下73%的方差和等速模式下34%的方差。
应在模拟日常生活活动的姿势下确定患者的力量特征，以确定损伤情况并制定康复计划。
