LaStayo P, Chidgey L, Miller G
Department of Physical Therapy, University of Florida, Gainesville 32610, USA.
Ann Plast Surg. 1995 Aug;35(2):191-6. doi: 10.1097/00000637-199508000-00013.
Clinically, the measurement of grip strength is a static measure. It is performed in a standardized posture with the arm at the side, elbow flexed to 90 degrees, and the wrist-forearm positioned in neutral. Many functional activities require dynamic grip strength when an individual moves the wrist-forearm while simultaneously gripping an object. This preliminary study investigated dynamic forearm rotation with isometric grip strength over real time. Thirty wrists from 15 normal subjects were measured with a tilt sensor attached to a strain gauge dynamometer. Each subject underwent randomized trials of maximally gripping the dynamometer while rotating the forearm over a 10-second period. A multiple-regression model was fit for the parameters of extremity, forearm rotation order, fatigue, and loss of strength with supination and pronation. For each parameter, the mean and standard error of its estimate were computed and compared with zero. The significant effects (p = 0.05) of interest were for fatigue and the loss of grip strength from 70 degrees of supination to the end range of supination. Comparisons to existing static grip strength literature were made. We concluded that there is a decrease in grip strength over time as a result of fatigue, there is a decrease in grip strength at supination angles greater than 70 degrees. There is no decrease in grip strength resulting from supination angles less than 70 degrees, nor is there a decrease in grip strength with pronation when measured dynamically. It is suggested that there may be a difference in static and dynamic GS measurements related to forearm rotation.
临床上，握力测量是一种静态测量方法。它在标准化姿势下进行，手臂放在身体一侧，肘部弯曲至90度，手腕-前臂处于中立位置。当个体在抓握物体的同时移动手腕-前臂时，许多功能活动需要动态握力。这项初步研究实时调查了等长握力下的动态前臂旋转。使用附着在应变片式测力计上的倾斜传感器测量了15名正常受试者的30只手腕。每个受试者在10秒内旋转前臂的同时进行最大程度抓握测力计的随机试验。针对肢体、前臂旋转顺序、疲劳以及旋前和旋后时的力量损失等参数拟合了多元回归模型。对于每个参数，计算其估计值的均值和标准误差，并与零进行比较。感兴趣的显著影响（p = 0.05）是疲劳以及从旋前70度到旋前末端范围的握力损失。与现有的静态握力文献进行了比较。我们得出结论，由于疲劳，握力随时间下降，在旋前角度大于70度时握力下降。旋前角度小于70度时握力没有下降，动态测量时旋后也没有握力下降。建议在与前臂旋转相关的静态和动态握力测量中可能存在差异。
