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• W1928753816 endingPage "5554" @default.
• W1928753816 startingPage "5541" @default.
• W1928753816 abstract "This study investigated the modulation of Ia afferent input in young and elderly adults during quiet upright stance in normal and modified visual and proprioceptive conditions. The surface EMG of leg muscles, recruitment curve of the soleus (SOL) Hoffmann (H) reflex and presynaptic inhibition of Ia afferents from SOL, assessed with the D1 inhibition and single motor unit methods, were recorded when young and elderly adults stood with eyes open or closed on two surfaces (rigid vs. foam) placed over a force platform. The results showed that elderly adults had a longer path length for the centre of pressure and larger antero-posterior body sway across balance conditions (P < 0.05). Muscle EMG activities were greater in elderly compared with young adults (P < 0.05), whereas the H(max) expressed as a percentage of the H(max) was lower (P = 0.048) in elderly (38 ± 16%) than young adults (58 ± 16%). The conditioned H reflex/test H reflex ratio (D1 inhibition method) increased with eye closure and when standing on foam (P < 0.05), with greater increases for elderly adults (P = 0.019). These changes were accompanied by a reduced peak motor unit discharge probability when standing on rigid and foam surfaces (P 0.001), with a greater effect for elderly adults (P = 0.026). Based on these latter results, the increased conditioned H reflex/test H reflex ratio in similar sensory conditions is likely to reflect occlusion at the level of presynaptic inhibitory interneurones. Together, these findings indicate that elderly adults exhibit greater modulation of Ia presynaptic inhibition than young adults with variation in the sensory conditions during upright standing." @default.
• W1928753816 created "2016-06-24" @default.
• W1928753816 creator A5073887372 @default.
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• W1928753816 date "2012-10-29" @default.
• W1928753816 modified "2023-10-14" @default.
• W1928753816 title "Age-related influence of vision and proprioception on Ia presynaptic inhibition in soleus muscle during upright stance" @default.
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• W1928753816 doi "https://doi.org/10.1113/jphysiol.2012.228932" @default.
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