Effect of vibrations with two different amplitudes on the ECG.
The ECG response of a human body exposed to vertical vibrations was investigated. The per cent normalized difference (PND) between the R-wave amplitude before and after vibrations was monitored. Results obtained from a representative subject show an oscillatory decay of the PND behaviour with time. This behaviour can be modelled as a linear second order damped system. The natural frequency, damping ratio and the recovery time of the cardiac system can be measured.
Qassem
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Hijjawi Faculty for Applied Engineering, Yarmouk University, Irbid, Jordan.
al-Nashash
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Othman
M O
MO
D000328:Adult; D000703:Analog-Digital Conversion; D004562:Electrocardiography; D006801:Humans; D008955:Models, Cardiovascular; D009200:Myocardial Contraction / Q000502:physiology; D012016:Reference Values; D012815:Signal Processing, Computer-Assisted; D014732:Vibration / Q000009:adverse effects*