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Accelerometer Sensor System for Continuous Determination of Systolic Time Intervals

Previous studies have proven the feasibility of using accelerometers for sensing heart sounds (HS). HS enhance ECG with information about mechanical activity of the heart and can be used to define systolic time intervals (STI). Changes in valuable physiological cardiovascular parameters are expected to affect STIs. We have investigated the alterations in STIs as a response to postural change using a low cost accelerometer sensor system.