Related Experiment Videos
Alterations in R-R variability associated with experimental motion sickness
I Doweck1, C R Gordon, A Shlitner
1Motion Sickness and Human Performance Laboratory, Israel Naval Medical Institute, IDF Medical Corps, Haifa, Israel.
Journal of the Autonomic Nervous System
|February 21, 1998
Summary
This study found that motion sickness reduces parasympathetic activity, indicated by changes in heart rate variability during a vestibular disorientation test. This provides an objective measure for autonomic responses during motion sickness.
Area of Science:
- Neuroscience
- Physiology
- Autonomic Nervous System Research
Background:
- Motion sickness involves complex physiological responses, with ongoing debate about sympathetic versus parasympathetic system involvement.
- Understanding autonomic nervous system (ANS) activity is crucial for elucidating motion sickness mechanisms.
Purpose of the Study:
- To investigate alterations in heart rate variability (HRV) during experimental motion sickness.
- To determine if sympathetic or parasympathetic systems are primarily affected during motion sickness.
Main Methods:
- Participants underwent a brief vestibular disorientation test (BVDT).
- Power spectrum analysis of R-R intervals was performed before, during, and after the BVDT.
- Subjects reported their symptoms, and HRV was compared between motion-sick and non-motion-sick groups.
Main Results:
- Motion-sick subjects exhibited a significant reduction in R-R interval power spectrum density at mid and high frequencies during the BVDT.
- These HRV changes suggest a decrease in parasympathetic activity during motion sickness.
- Non-motion-sick subjects showed no significant HRV differences during the BVDT.
Conclusions:
- Power spectrum analysis of R-R intervals offers an objective method to assess autonomic responses in experimental motion sickness.
- Findings indicate a reduction in parasympathetic tone as a key physiological change during motion sickness.