A new non-invasive approach for monitoring respiratory movements of sleeping subjects

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Abstract
The authors have developed a minimally intrusive system to monitor respiratory movements of sleeping subjects. This system is based on a pressure transducer which measures the changes in air pressure inside an inflatable mattress on which the subject sleeps. Using a mechanical filter to protect the transducer against the large pressure changes due to sudden movements and subject weight, one can detect the more subtle movements of the subject's chest. Here, the authors discuss the design of the monitoring system, including the design and modelling of the mechanical filter.