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Incitation à l’activité physique des personnes âgées par réseaux de capteurs sans fil

Abstract : Today, regular physical activity is an effective way to maintain goodhealth, especially with age. Despite this, older people are often sedentary and do not reach recommended levels. The use of body sensor networks is therefore part of a strategy to encourage physical activity. In this thesis, we propose a solution based ona device worn on the wrist and which transmits data related to physical activity during walking. The device is connected using optical wireless technology, which is an alternative to radiofrequency one that, with the growing number of connected objects, have limits in terms of interference, security and confidentiality. The objective is to determine the characteristics and the optimal performances by taking into account the specificities related to the scenario but also to the age of the person. We propose a suitable optical wireless communication channel model for this purpose and we discuss the impact of the body modelof the person, young or old, the step length, the walking speed and the limb movements. All of these parameters depend on age. To take into account the temporal evolution of performance during walking, outage probability is determined by taking into account the correlation by the sliding window technique. We show both theoretically and experimentally that by considering a model of a young person, performance can be underestimated or overestimated. It is therefore important to use a suitable elderly person model to effectively design the system. In addition, to guarantee connectivity while walking, a hybrid system is proposed where a radio link takes over from the optical system when the latter is broken. The hybrid system performance is studied with the objective of minimizing radio transmission timeshowingthe effectiveness of the hybrid system for monitoringan elderly person.
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Submitted on : Tuesday, April 5, 2022 - 3:59:09 PM
Last modification on : Wednesday, April 6, 2022 - 3:32:25 AM
Long-term archiving on: : Wednesday, July 6, 2022 - 7:13:36 PM


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  • HAL Id : tel-03631391, version 1



Alassane Kaba. Incitation à l’activité physique des personnes âgées par réseaux de capteurs sans fil. Optique / photonique. Université de Limoges, 2022. Français. ⟨NNT : 2022LIMO0020⟩. ⟨tel-03631391⟩



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