title: Effect of vibrations with two different amplitudes on the ECG.
abstract: 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.
authors.affiliation: Hijjawi Faculty for Applied Engineering, Yarmouk University, Irbid, Jordan.
authors.forename: W
authors.initials: W
authors.lastname: Qassem
authors.forename: H
authors.initials: H
authors.lastname: al-Nashash
authors.forename: M O
authors.initials: MO
authors.lastname: Othman
mesh_terms: 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*