Contact-free measurement of heart rate, respiration rate, and body movements during sleep |
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Authors: | Mark Brink Christopher H Müller Christoph Schierz |
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Institution: | (1) Department of Medical System Engineering, Chiba University, Graduate School of Engineering, Chiba, Japan |
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Abstract: | We describe a noncontact method for the ambulant measurement of basic sleep physiology parameters in humans, particularly
for field studies involving sleep research and sleep disturbances. This method traces the body movements, respiration, and
heart action of a person at rest or asleep on a bed, using four high-resolution force sensors installed under the bedposts.
The recoil movement of the body at each heartbeat, known as the cardioballistic effect, as well as the lifting and lowering
of the thorax, while breathing, causes very small shifts of the center of gravity of the bed and the subject. These shifts
are reflected in the altering force distributions across the four sensors. Cardiac and respiratory parameters and the subject’s
movement activity can be calculated from the sensor signals. Neither electrodes nor other kinds of transducers are in direct
contact with the subject, which is the main advantage of this technique over conventional methods. Laboratory experiments
were carried out to estimate validity and practicability. The method has been found to be adequate, especially for automated
and unattended sleep-data collection over long periods of time. |
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Keywords: | |
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