Increased age is associated with impaired performance in vestibular, visual and somesthesic systems, a decline in the speed of information transmission and changes in the mode of information processing in the brain, allof which lead to balance and postural disorders ( Brocklehurst et al 1982 Aniansson et al 1986 Woollacott 1993 Choy et al 2003 Yordanova et al 2004). In addition, the quality of muscle and joints is important in the balance function ( Alencar et al 2007). Indeed, balance controlis a complex sensori-motor function which requires the integration of vestibular, visual, and somesthetic information into the central nervous system (pyramidal, extrapyramidal, and cerebellar systems) in order to maintain antigravitar postures and to produce a suitable response to any balance perturbation ( Horak and McPherson 1996). The prevalence and the severity of posture and gait disorders increase with ageing ( Salthouse and Somberg 1982 Maki et al 1994 Mourey et al 1998 Rankin et al 2000).
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