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Advisor(s)
Abstract(s)
This study investigated the influence of wearing unstable shoe construction
(WUS) on compensatory postural adjustments (CPA)
associated with external perturbations. Thirty-two subjects stood
on a force platform resisting an anterior-posterior horizontal force
applied to a pelvic belt via a cable, which was suddenly released.
They stood under two conditions: barefoot and WUS. The electromyographic
(EMG) activity of gastrocnemius medialis, tibialis
anterior, rectus femoris, biceps femoris, rectus abdominis, and
erector spinae muscles and the center of pressure (CoP) displacement
were acquired to study CPA. The EMG signal was used to
assess individual muscle activity and latency, antagonist co-activation
and reciprocal activation at joint and muscle group levels.
Compared to barefoot, WUS led to: (1) increased gastrocnemius
medialis activity, (2) increased total agonist activity, (3) decreased
antagonist co-activation at the ankle joint and muscle group levels,
(4) increased reciprocal activation at the ankle joint and muscle
group levels, and (5) decrease in all muscle latencies. No differences
were observed in CoP displacement between conditions.
These findings demonstrate that WUS led to a reorganization of
the postural control system associated to improved performance
of some components of postural control responses.
Description
Keywords
Posture External perturbation Compensatory postural adjustments Electromyography Center of pressure Unstable shoe construction
Pedagogical Context
Citation
Publisher
Elsevier