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Control of mediolateral stability during rapid step initiation with preferred and non-preferred leg: is it symmetrical?
Gait & Posture 2010 May
During voluntary stepping initiation, postural stability along the mediolateral direction is controlled via "anticipatory postural adjustment" (APA). This study tested the hypothesis that, in young healthy subjects, the biomechanical features of mediolateral APA depend on the leg that initiates stepping. Subjects (N=10) initiated a rapid single step with the preferred (P condition) and the non-preferred leg (NP condition) on a force-plate. Results showed that mediolateral APA duration (P=0.020) and amplitude were higher (as attested by the increase in maximal center-of-gravity velocity (P=0.003) and displacement (P<0.001) during APA), and that mediolateral stability was better (as attested by the attenuation in center-of-gravity velocity at time of swing-foot contact (P=0.007)) in P than in NP. These results support the view that stepping initiation in healthy subjects involves postural asymmetry. This statement may have relevant implications in clinical evaluation where postural asymmetry is generally considered as reflecting postural impairment.
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