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Long-term monitoring of mobility is beneficial in quantifying a person's functional health status. Deterioration in the health status of an elderly person living alone can indicate the onset of an illness or a reduction in their ability to care for themselves. A telemonitoring system, based on SMS (Short Message Service), has been redeveloped to remotely monitor the long-term mobility levels of elderly people in their living environment. Mobility is measured by an accelerometer-based portable unit, worn by each monitored subject. Mobility level summaries are transmitted hourly, as SMS messages, directly from the portable unit to a remote server for long-term analysis. Each subject's mobility levels are monitored at the remote server using custom-designed mobility alert software and the appropriate medical personnel are alerted, by SMS, if deterioration in the subject's mobility levels is detected. This paper describes the redevelopment of the portable unit and the results from a preliminary evaluation of this unit in a smart home setting. The system was tested on 4 young subjects, for a total of 24.25 hours, and was shown to have an average posture detection accuracy of 98.59%. It is expected that this system would reduce the financial burden on healthcare providers, by enabling more efficient allocation of healthcare resources, and would thus allow elderly persons to remain in their preferred environment, their home, for as long as possible.
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