Article

This investigation assessed whether a measure of moment curve shape similarity,
and a measure quantifying curve magnitude differences, enables differentiation
between types (sincere vs. feigned) and levels (maximal vs. submaximal) of effort
exerted during isokinetic testing of the knee. Healthy participants (n=37)
performed four sets of six concentric knee extension-flexion repetitions on two
occasions. The sets consisted of: (1) maximal effort; (2) self-perceived 75% of
maximal effort; (3) self-perceived 50% of maximal effort;
and (4) a set
attempting to feign injury. Average cross-correlation and percent root mean
square difference values were computed between moment curves in each direction.
Logistic regression was used to derive decision rules for differentiating between
maximal and submaximal effort levels; and between sincere and feigned effort
types. Using a cutoff criteria corresponding to 100% specificity, maximal effort
production could be ascertained with 96% sensitivity within the sample. Feigned
efforts, however, could be ascertained with only 31% sensitivity due to overlap
with sincere submaximal effort. Using the proposed models, clinicians may be able
to ascertain whether maximal efforts were produced during isokinetic knee
musculature testing. Additionally, evidence regarding participant's intentions
with regard to influencing test results may be gauged, although to a lesser extent.
CI - Copyright (c) 2011 Elsevier Ltd. All rights reserved.

Langue : ANGLAIS