Article

This study investigated the effect of touch on trunk sway in a seated position.
Two touch conditions were included: touching an object with the index finger of
the right hand (hand-touch) and maintaining contact with an object at the level
of the spine of T10 on the mid back (back-touch). In both touch conditions, the
exerted force stayed below 2N. Furthermore, the interaction of touch with
paraspinal muscle vibration and galvanic vestibular stimulation (GVS) was
studied. Thirteen healthy subjects with no history of low-back pain participated
in this study. Subjects sat on a stool and trunk sway was measured with a motion
capture system tracking a cluster marker on the trunk. Subjects performed a total
of 12 trials of 60-s duration in a randomized order, combining the experimental
conditions of no-touch, hand-touch or back-touch with no sensory perturbation,
paraspinal muscle vibration or GVS. The results showed that touch through hand or
back decreased trunk sway and decreased the effects of muscle vibration and GVS.
GVS led to a large increase in sway whereas the effect of muscle vibration was
only observed as an increase of drift and not of sway. In the current
experimental set-up, the stabilizing effect of touch was strong enough to mask
any effects of perturbations of vestibular and paraspinal muscle spindle
afference. In conclusion, tactile information, whenever available, seems to play
a dominant role in seated postural sway and therefore has important implications
for studying trunk control.
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Langue : ANGLAIS