Barlow Steven M, Hozan Mohsen, Lee Jaehoon, Greenwood Jake, Custead Rebecca, Wardyn Brianna, Tippin Kaytlin
Department of Special Education and Communication Disorders, University of Nebraska, 141 Barkley Memorial Center, Lincoln, NE 68583-0738, USA; Department of Biological Systems Engineering, University of Nebraska, 230 L.W. Chase Hall, Lincoln, NE 68583-0726, USA; Center for Brain, Biology, and Behavior, University of Nebraska, C89 East Stadium, Lincoln, NE 68588-0156, USA.
Department of Educational Psychology & Leadership, Texas Tech University, PO Box 41071, Lubbock, TX 79409, USA.
J Biomech. 2018 Apr 27;72:81-89. doi: 10.1016/j.jbiomech.2018.02.031. Epub 2018 Mar 6.
The relation among several parameters of the ramp-and-hold isometric force contraction (peak force and dF/dt during the initial phase of force recruitment, and the proportion of hold-phase at target) was quantified for the right and left thumb-index finger pinch, and lower lip midline compression in 40 neurotypical right-handed young adults (20 female/20 males) using wireless force sensors and data acquisition technology developed in our laboratory. In this visuomotor control task, participants produced ramp-and-hold isometric forces as 'rapidly and accurately' as possible to end-point target levels at 0.25, 0.5, 1 and 2 Newtons presented to a computer monitor in a randomized block design. Significant relations were found between the parameters of the ramp-and-hold lip force task and target force level, including the peak rate of force change (dF/dt), peak force, and the criterion percentage of force within ±5% of target during the contraction hold phase. A significant performance advantage was found among these force variables for the thumb-index finger over the lower lip. The maximum voluntary compression force (MVCF) task revealed highly significant differences in force output between the thumb-index fingers and lower lip (∼4.47-4.70 times greater for the digits versus lower lip), a significant advantage of the right thumb-index finger over the non-dominant left thumb-index finger (12% and 25% right hand advantage for males and females, respectively), and a significant sex difference (∼1.65-1.73 times greater among males).
使用我们实验室开发的无线力传感器和数据采集技术，对40名神经典型的右利手年轻成年人（20名女性/20名男性）的右手和左手拇指-食指捏力以及下唇中线压力的斜坡-保持等长力收缩的几个参数（力募集初始阶段的峰值力和dF/dt，以及目标保持阶段的比例）之间的关系进行了量化。在这个视觉运动控制任务中，参与者以随机区组设计的方式，尽可能“快速且准确”地产生斜坡-保持等长力，以达到电脑显示器上呈现的0.25、0.5、1和2牛顿的终点目标水平。在斜坡-保持唇部力任务的参数与目标力水平之间发现了显著关系，包括力变化的峰值速率（dF/dt）、峰值力，以及收缩保持阶段目标力±5%范围内的力的标准百分比。在这些力变量中，拇指-食指的表现明显优于下唇。最大自主压缩力（MVCF）任务显示，拇指-食指和下唇之间的力输出存在高度显著差异（手指的力输出比下唇大4.47 - 4.70倍），右拇指-食指相对于非优势左手拇指-食指具有显著优势（男性和女性的右手优势分别为12%和25%），并且存在显著的性别差异（男性的力输出比女性大1.65 - 1.73倍）。
