Gao Fan, Latash Mark L, Zatsiorsky Vladimir M
Sensory Motor Performance Program, Rehabilitation Institute of Chicago, Chicago, Illinois 60611, USA.
J Hand Ther. 2007 Oct-Dec;20(4):300-7; quiz 308; discussion 309. doi: 10.1197/j.jht.2007.06.002.
The tight coupling between load (L) and grip (G) forces during voluntary manipulation of a hand-held object is well established. The current study is to examine grip-load force coupling when motion of the hand with an object was either self-generated (voluntary) or externally generated. Subjects performed similar cyclic movements of different loads at various frequencies with three types of manipulations: 1) voluntary oscillation, 2) oscillating the right arm via the pulley system by the left leg (self-driven oscillation), and 3) oscillating the arm via the pulley system by another person (other-driven oscillation). During the self-generated movements: 1) the grip forces were larger and 2) grip-load force modulation was more pronounced than in the externally generated movements. The G-L adjustments are not completely determined by the mechanics of object motion; nonmechanical factors related to movement performance, for instance perceptual factors, may affect the G-L coupling.
在自愿操作手持物体时，负载（L）力与握力（G）之间的紧密耦合已得到充分证实。当前的研究旨在考察当手部与物体的运动是自我产生（自愿）还是外部产生时的握力-负载力耦合情况。受试者通过三种操作方式，以不同频率对不同负载进行了类似的循环运动：1）自愿振荡，2）用左腿通过滑轮系统摆动右臂（自驱动振荡），以及3）由另一个人通过滑轮系统摆动手臂（他人驱动振荡）。在自我产生的运动过程中：1）握力更大，并且2）与外部产生的运动相比，握力-负载力调制更为明显。握力-负载力的调整并非完全由物体运动的力学原理决定；与运动表现相关的非力学因素，例如感知因素，可能会影响握力-负载力耦合。
