Emge Nicholas, Uygur Mehmet, Radivoj Mandic, Kaminski Thomas W, Royer Todd, Jaric Slobodan
a Department of Kinesiology and Applied Physiology , University of Delaware , Newark.
J Mot Behav. 2014;46(4):259-65. doi: 10.1080/00222895.2014.893981. Epub 2014 Apr 14.
Effects of muscle fatigue on force coordination and task performance of various manipulation tasks are explored. Grip force (GF; normal force component acting at the digits-object contact area) and load force (LF; tangential component that lifts and holds objects) were recorded prior to and after fatiguing the distal (DAM; i.e., GF producing) and proximal arm muscles (PAM; LF producing). Results reveal a deterioration of GF scaling (i.e., averaged GF-LF ratio), GF-LF coupling (their correlation), and task performance (ability to exert a prescribed LF pattern) associated with DAM, but not PAM fatigue. Deteriorated force coordination clearly increases the likelihood of dropping an object; however, the observed selective effects of DAM and PAM fatigue represent a novel finding deserving of further research.
探讨了肌肉疲劳对各种操作任务的力协调和任务表现的影响。在使远端（即产生握力的）和近端手臂肌肉（产生负载力的）疲劳之前和之后，记录了握力（GF；作用于手指与物体接触区域的法向力分量）和负载力（LF；提起和握住物体的切向分量）。结果显示，与远端手臂肌肉疲劳相关的握力缩放（即平均握力 - 负载力比值）、握力 - 负载力耦合（它们的相关性）和任务表现（施加规定负载力模式的能力）有所恶化，但近端手臂肌肉疲劳并未导致这种情况。力协调的恶化明显增加了物体掉落的可能性；然而，观察到的远端和近端手臂肌肉疲劳的选择性效应是一个值得进一步研究的新发现。
