Effect of vibrations with two different amplitudes on the ECG

Area of Science:

• Biomedical Engineering
• Human Physiology
• Cardiovascular System Dynamics

Background:

• Understanding human physiological responses to external stimuli is crucial.
• Vibration exposure can impact autonomic nervous system function.
• Electrocardiogram (ECG) provides insights into cardiac electrical activity.

Purpose of the Study:

• To investigate the effect of vertical vibrations on human ECG.
• To quantify the cardiac system's response to vibration exposure.
• To model the observed ECG changes over time.

Main Methods:

• Monitoring ECG R-wave amplitude changes before and after vibration exposure.
• Calculating the percent normalized difference (PND) of R-wave amplitude.
• Analyzing the temporal behavior of PND using a mathematical model.

Main Results:

• A representative subject showed an oscillatory decay in PND over time.
• The observed PND behavior was successfully modeled as a linear second-order damped system.
• Key parameters of the cardiac system's recovery were measurable.

Conclusions:

• Vertical vibrations induce measurable changes in human ECG.
• The cardiac response to vibrations exhibits damped oscillatory characteristics.
• This study demonstrates a method for quantifying cardiac recovery dynamics post-vibration.