Effect of vibrations with various duration exposure on the P–R interval of ECG

Abstract

ECG analysis of a human body subjected to vertical vibrations of various durations was carried out. Results obtained from a representative subject show that the exposure period has different effects on the P–R time interval of the ECG waves. Vibration increases the Percent Normalized Difference (PND) of the P–R time interval with time till it reaches a steady state value of 29.5. An increase of the exposure duration increases the time constant, while the steady state value remains constant. The PND behavior can be mathematically modeled as a first order system.