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The effects of blurring vision on medio-lateral balance during stepping up or down to a new level in the elderly
BUCKLEY JG; HEASLEY K; SCALLY A; ELLIOTT DB
GAIT POSTURE , 2005, vol. 22, n° 2, p. 146-153 Doc n°: 122456 Localisation : Documentation IRR Descripteurs : DF11 - POSTURE. STATION DEBOUT, MA - GERONTOLOGIE Visual impairment is an important risk factor for falls, but relatively little is known about how it affects stair negotiation. The present study determined how medio-lateral (ML) dynamics of stepping and single limb support stability when stepping up or down to a new level were affected by blurring the vision of healthy elderly subjects. Twelve elderly subjects (72.3 +/- 4.2 years) were analysed performing single steps up and single steps down to a new level (7.2, 14.4 and 21.6 cm). Stepping dynamics were assessed by deter-mining the ML ground reaction force (GRF) impulse, lateral position of the centre of mass (CM) relative to the supporting foot (average horizontal ML distance between CM and CP during single support) and movement time. Stability was determined as the rms fluctuation in ML position of the centre of pressure (CP) during single support. Differences between optimal and blurred visual conditions were analysed using a random effects model. Duration of double and single support, and the ML GRF impulse were significantly greater when vision was blurred, while the average CM - CP ML distance and ML stability was reduced. ML stability decreased with increasing step height and was further decreased when stepping down than when stepping up. These findings indicate that ML balance during stepping up and down was significantly affected Langue : ANGLAIS |
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