Bleyenheuft Yannick, Lefèvre Philippe, Thonnard Jean-Louis
Physical Medicine and Rehabilitation Unit, Université Catholique de Louvain, Brussels, Belgium.
J Mot Behav. 2009 Oct;41(5):411-7. doi: 10.3200/35-08-084.
Impulsive loadings during object grasping are common in everyday life. In predictable conditions, the grip force (GF) increases before the impact to anticipate the perturbation and reaches a maximum after the perturbation. In the present study, the authors addressed the predictive or reactive nature of this late GF component. The load of a handheld object was briskly increased by dropping a mass attached to the object (impact trials). The drop was self-induced, but for one third of the trials, the mechanism was blocked and no impact occurred (blank trials). Evidence that the late GF component is programmed as a predictive action emerged from a systematic comparison between impact and blank trials. The authors conclude that the GF increase occurring after a predictable impulsive loading is essentially of a predictive nature.
在日常生活中，物体抓取过程中的冲击载荷很常见。在可预测的情况下，握力（GF）在冲击前增加以预期扰动，并在扰动后达到最大值。在本研究中，作者探讨了这种后期握力成分的预测性或反应性本质。通过掉落附着在物体上的重物（冲击试验），快速增加手持物体的负荷。掉落是自我诱发的，但在三分之一的试验中，该机制被阻断，未发生冲击（空白试验）。冲击试验和空白试验之间的系统比较表明，后期握力成分是作为一种预测性动作而被编程的。作者得出结论，在可预测的冲击载荷后握力的增加本质上具有预测性。
