Heart Rate Variability Responses to Visually Induced Motion Sickness.

Area of Science:

• Cardiovascular Physiology
• Neuroscience
• Biomedical Engineering

Background:

• Heart rate variability (HRV) is a key indicator of autonomic nervous system (ANS) function.
• Understanding ANS dynamics during motion sickness is crucial for developing effective interventions.
• Visually induced motion sickness presents a unique challenge for ANS regulation.

Purpose of the Study:

• To investigate characteristic changes in HRV during visually induced motion sickness.
• To apply nonlinear analytical methods to quantify ANS perturbations.
• To identify potential HRV biomarkers for motion sickness severity.

Main Methods:

• Computed HRV from electrocardiograms (ECG) in 14 healthy participants.
• Utilized nonlinear methods (SampEn, FuzzyEn, LLE) and conventional time/frequency analyses.
• Compared HRV parameters at baseline versus during induced nausea.

Main Results:

• Increased regularity (SampEn, FuzzyEn) and decreased chaos (LLE) in HRV during nausea.
• Significant increase in cardiac sympathetic activity (CSI) during nausea.
• No significant change in cardiac vagal index (CVI) observed.

Conclusions:

• Nonlinear HRV indices can quantify autonomic nervous system perturbations during motion sickness.
• Findings suggest motion sickness alters ANS complexity and chaotic dynamics.
• These HRV metrics may aid in clinical monitoring and therapeutic development for motion sickness.