Dvir Z
Department of Physical Therapy, Sackler Faculty of Medicine, Tel Aviv University, Ramat Aviv, Israel.
Am J Phys Med Rehabil. 1999 May-Jun;78(3):216-21. doi: 10.1097/00002060-199905000-00005.
The purpose of this study was to investigate the validity of the coefficient of variation as an identifier of feigned grip effort. Seventeen healthy female aged 20 to 25 yr participated in the study. Maximal and feigned efforts were measured isometrically and isokinetically (concentric and eccentric) using the Jamar and KinCom dynamometers, respectively. Findings indicated that, in all situations, the coefficient of variation derived from the maximal effort was significantly (P < 0.0001) lower than that derived from the feigned effort. However, the extent of overlapping between the two was sufficiently large to render the test sensitivities very low. Consequently, regardless of the measurement method, the coefficient of variation is not a valid tool for identifying feigned grip effort in healthy subjects.
本研究的目的是调查变异系数作为伪装握力努力识别指标的有效性。17名年龄在20至25岁之间的健康女性参与了该研究。分别使用Jamar和KinCom测力计等长和等速（向心和离心）测量最大和伪装努力。结果表明，在所有情况下，由最大努力得出的变异系数均显著低于（P < 0.0001）由伪装努力得出的变异系数。然而，两者之间的重叠程度足够大，导致测试敏感性非常低。因此，无论测量方法如何，变异系数都不是识别健康受试者伪装握力努力的有效工具。
