Article

Force generation during sit-to-walk (STW) post-stroke is a poorly studied area,
although STW is a common daily transfer giving rise to a risk of falling in
persons with disability. The purpose of this study was to describe and compare
strategies for anterior-posterior (AP) force generation prior to seat-off during
the STW transfer in both subjects with stroke and in matched controls. During STW
at self-selected speed, AP force data were collected by 4 force plates, beneath
the buttocks and feet from eight subjects with stroke (>6 months after onset) and
8 matched controls. Subjects with post-stroke hemiparesis and matched controls
generated a similar magnitude of total AP force impulses (F(1,71)=0.67; p=0.42)
beneath buttocks and feet prior to seat-off during STW. However, there were
significant group differences in AP force impulse generation beneath the stance
buttock (i.e. the non-paretic buttock in the stroke group), with longer duration
(F(1,71)=8.78; p<0.005), larger net AP impulse (F(1,71)=6.76; p<0.05) and larger
braking impulse (F(1,71)=7.24; p<0.05) in the stroke group. The total braking
impulse beneath buttocks and feet was about 4.5 times larger in the stroke group
than in the control group (F(1,71)=8.84; p<0.005). An intra- and inter-limb
dys-coordination with substantial use of braking impulses was demonstrated in the
stroke group. This motor strategy differed markedly from the smooth force
interaction in the control group. These results might be important in the
development of treatment models related to locomotion post-stroke.
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Langue : ANGLAIS