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The possibility of attaching measurement systems to the bed and sanitary equipments in order to monitor physiological functions in daily life is examined. Preliminary experiments revealed that (1) information about body temperature and body movement during sleep can be obtained from temperature recordings in the bed, (2) electrocardiograms (ECGs) can be recorded in a bathtub through the tap water and (3) heart rate can be estimated by ECGs obtained on the toilet seat.>
Togawa et al. (Mon,) studied this question.
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