Article

The variability of peroneal reaction time measurements is a major
problem when using this parameter to control rehabilitation or proprioceptive
training processes. In order to control peroneal reaction time values, some
extrinsic factors should be considered. The purpose of this study was to measure
peroneal reaction time in unipodal stance for two different destabilization axes.
METHODS: The peroneal reaction time of 10 healthy subjects was measured from
kinematic and electromyograhic data in an experimental study using an ankle
destabilization device. FINDINGS: In a preliminary analysis, results showed that
the destabilization axis orientation did not affect peroneal reaction time values
(68.5 ms, standard deviation=9.5 ms and 71.5 ms, standard deviation=8 ms for
destabilizations in the frontal plane and around the Henke's axis, respectively).
However, the inter-trial variance of inversion velocity peaks explained between
40% and 49% of the peroneal reaction time variance. When trials were selected on
the basis of homogeneous inversion velocity peaks, results showed that peroneal
reaction time values for the peroneus brevis were shorter during inversion
movements performed around the physiological Henke's tilting axis (63 ms,
standard deviation=9 ms vs. 71 ms, standard deviation=8 ms). INTERPRETATION: Our
findings evidenced that tilting axis orientation must be considered as an
extrinsic factor that may influence peroneal reaction time. Moreover it also
seems necessary to consider inversion speed values to adequately compare peroneal
reaction time values.
CI - Copyright (c) 2011 Elsevier Ltd. All rights reserved.

Langue : ANGLAIS