Niebuhr B R, Marion R
School of Allied Health Sciences, University of Texas Medical Branch, Galveston 77550.
Am J Phys Med Rehabil. 1990 Apr;69(2):96-101. doi: 10.1097/00002060-199004000-00010.
Stokes (J Occup Med; 1983;25:683-684) proposed that feigned weak hand grip can be distinguished from sincere efforts by examining force measurements for the different handle positions of the Jamar hand dynamometer. Sincere efforts yield a curvilinear relationship between grip force and handle position; feigned efforts yield a horizontal, linear relationship. The purpose of the present set of three experiments was to investigate the degree of control normal subjects have over submaximal effort and their ability to feign weakened grip. In Experiment 1 we found that subjects instructed to exert a specific amount of submaximal effort (50%) did not produce a response pattern of grip force consistent with Stokes' hypothesis. In Experiment 2 we found a linear relationship between the degree of submaximal effort and grip force for efforts of 30, 50, 70, and 90% of maximal effort. In Experiment 3 we found that subjects, with proper instruction as to the amount of effort to exert, can produce feigned submaximal efforts similar to the sincere, maximal efforts of injured people. Simple maximal grip force measurements are insensitive to the different motor strategies used in maximal and submaximal efforts and may provide little evidence for the detection of feigning.
斯托克斯（《职业医学杂志》；1983年；25卷：683 - 684页）提出，通过检查贾马尔握力计不同手柄位置的力测量值，可以区分假装的弱握力和真实的努力。真实的努力会在握力和手柄位置之间产生曲线关系；假装的努力会产生水平的线性关系。本系列三个实验的目的是研究正常受试者对次最大努力的控制程度以及他们假装握力减弱的能力。在实验1中，我们发现被指示施加特定量次最大努力（50%）的受试者没有产生与斯托克斯假设一致的握力反应模式。在实验2中，我们发现对于最大努力的30%、50%、70%和90%的努力，次最大努力程度与握力之间存在线性关系。在实验3中，我们发现，在得到关于要施加的努力量的适当指示后，受试者可以产生类似于受伤者真实最大努力的假装次最大努力。简单的最大握力测量对最大和次最大努力中使用的不同运动策略不敏感，可能几乎无法为检测假装提供证据。
