title: Development of an advanced mechanised gait trainer, controlling movement of the centre of mass, for restoring gait in non-ambulant subjects.
abstract: The study aimed at further development of a mechanised gait trainer which would allow non-ambulant people to practice a gait-like motion repeatedly. To simulate normal gait, discrete stance and swing phases, lasting 60% and 40% of the gait cycle respectively, and the control of the movement of the centre of mass were required. A complex gear system provided the gait-like movement of two foot plates with a ratio of 60% to 40% between the stance and swing phases. A controlled propulsion system adjusted its output according to patient's efforts. Two eccenters on the central gear controlled phase-adjusted the vertical and horizontal position of the centre of mass. The patterns of sagittal lower limb joint kinematics and of muscle activation of a normal subject were similar when using the mechanised trainer and when walking on a treadmill. A non-ambulatory hemiparetic subject required little help from one therapist on the gait trainer, while two therapists supported treadmill walking. Gait movements on the trainer were highly symmetrical, impact-free, and less spastic. The weight-bearing muscles were activated in a similar fashion during both conditions. The vertical displacement of the centre of mass was bi-instead of mono-phasic during each gait cycle on the new device. In conclusion, the gait trainer allowed wheelchair-bound subjects the repetitive practice of a gait-like movement without overstraining therapists.
authors.affiliation: Klinik Berlin, Department of Neurological Rehabilitation, Free University Berlin, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Hesse
authors.forename: T
authors.initials: T
authors.lastname: Sarkodie-Gyan
authors.forename: D
authors.initials: D
authors.lastname: Uhlenbrock
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D004576:Electromyography; D004867:Equipment Design; D005260:Female; D005684:Gait; D006429:Hemiplegia / Q000534:rehabilitation*; D006801:Humans; D008297:Male; D008875:Middle Aged; D026741:Physical Therapy Modalities / Q000295:instrumentation*; D012046:Rehabilitation / Q000295:instrumentation*