Article

Muscle strength test outcomes may aid in determination of impairment
or disability rating following injury. In such settings, verification of
participant effort during testing is imperative. This investigation explored the
utilization of within-set moment waveform similarity measures, namely cross
correlation and percent root mean square difference scores, to develop decision
rules for discriminating between maximal and feigned efforts during isokinetic
testing of the knee joint musculature. METHODS: A mixed-gender sample of 46
participants performed non-reciprocal sets of maximal or feigned knee extension
and flexion concentric and eccentric efforts at testing velocities of 30 degrees
s(-1) and 120 degrees s(-1). Logistic regression and Monte Carlo simulations were
used to derive decision rules for differentiating between the two effort types.
FINDINGS: Employing cutoff scores corresponding to 100% specificity;
sensitivities of the knee extensor's velocity-specific decision rules were 92.4%
and 84.8%, respectively. The velocity-specific knee flexor's test sensitivities
were 56.5% and 46.7%. INTERPRETATION: Utilizing the proposed decision rules,
substantiating maximal effort performance of the knee extensors may be possible
using this specific testing protocol. However, the proposed methods are limited
in their ability to verify performance of maximal knee flexor efforts.
CI - Copyright (c) 2011 Elsevier Ltd. All rights reserved.

Langue : ANGLAIS