Abstract
The design and testing of a modified tricycle (hip extensor tricycle) designed to isolate and exercise the hip extensor muscles in children with cerebral palsy is presented. Initial laboratory tests involved stability evaluation and EMG studies of two normal children. Field evaluation involved five children diagnosed with cerebral palsy who were given hip extensor tricycles for home use during an 8-week test period. The hip extensor strength and gait pattern of the subjects were recorded at 2-week intervals. The clinical tests indicated that the hip extensor tricycle was more stable, and resulted in more hip extensor muscle activity, than the traditional therapeutic/exercise tricycle. A panel of experts judged that the gait patterns of four of the five subjects improved during the course of the study. Parent evaluations indicated that the use of the hip extensor tricycle improved the subjects' physical condition, coordination, sense of accomplishment, and self-esteem.
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