Article

The purpose of this study was to determine the effects of symmetric and
asymmetric foot placements on joint moments during sit-to-stand movements. Three
symmetric (foot-neutral, foot-back, and foot-intermediate) and three asymmetric
foot placements (preferred stagger, nonpreferred stagger, and intermediate
stagger) were tested. Standard (46 cm) and low (41 cm) seat heights were chosen
to represent an average public seat height and a 10% lower seat height. Using
inverse dynamics, maximum ankle plantarflexion, knee extension, hip extension,
and hip abduction moments were calculated. Hip extension moments were
significantly increased when using foot-neutral as compared to foot-back. Ankle
plantarflexion and knee extension moments were significantly increased when a
foot was placed in the posterior position as compared to the anterior position
for preferred and nonpreferred stagger. Knee extension moments were significantly
increased at the low seat height as compared to the standard seat height. When
shifting the feet anterior or posterior for symmetric placements during
sit-to-stand, the most dramatic effect was an increase in hip extension moments
when the feet are shifted anteriorly. Utilizing asymmetric foot placements during
sit-to-stand produced increases in ankle plantarflexion and knee extension
moments for the posteriorly placed limb, with reductions in the anteriorly placed
limb.
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Langue : ANGLAIS