Background: An inverse relationship exists between torque and velocity, with torque increasing
as velocity decreases and vice versa.1 For example, maximal torque is produced during isometric effort, when velocity equals
0. For a single joint movement, such as knee extension2,3 and elbow flexion,4 the inverse torque–velocity relationship is linear for the midrange torques and velocities.
This linear relationship is maintained when maximal effort is exerted, regardless
of age, training level, and fatigue. It is hypothesized that submaximal effort does
not produce a linear torque–velocity relationship because replicating a submaximal
isotonic contraction requires an enormous amount of proprioceptive feedback and the
nervous system may not be able to accurately replicate both force and speed of contraction.
If this hypothesis is true, the torque–velocity test of the BTE-Primus may be an effective
method for assessing sincerity of effort.
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Short Description: This study examined if the “torque–velocity test” of the BTE-Primus could distinguish between maximal and submaximal grip-strength efforts. The torque–velocity relationships exhibited significantly greater linearity (r2) for maximal effort. Nevertheless, the test misclassified 31% of submaximal and 28% of maximal efforts. Therefore, this test does not possess adequate sensitivity and specificity values to justify its use in the clinic.
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© 2006 Hanley & Belfus. Published by Elsevier Inc. All rights reserved.
