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This paper describes the development of two low power wireless Body Sensor Network (BSN) prototypes that allow the real-time monitoring of wearable sensors data from multiple users with a single base station. The prototypes present differences in the architecture, wireless network hardware and implemented protocols. These systems integrate inertial sensors that allow the monitoring of users' posture and goniometric development, as well as heart rate and respiratory rate sensors. The design of body sensor networks is challenging due to the requirements of quality of service provisioning and low energy consumption, combined in many cases with high traffic loads.
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