Understanding Motion Sickness and the Aging Body
Motion sickness is a complex physiological reaction triggered by a conflict between what your eyes see, what your inner ear senses, and what your body's proprioceptors (position-sensing nerves) feel. When these signals don't align—for instance, reading a book in a moving car where your eyes perceive stillness while your inner ear senses motion—the brain gets confused, leading to symptoms like nausea, dizziness, and fatigue.
The Surprising Age-Related Trend
Contrary to what many people assume, a healthy older adult is often less susceptible to motion sickness than a child. As people move past puberty and into adulthood, their brains become more skilled at contextualizing and adapting to these sensory conflicts. However, this general trend does not apply to everyone, and for a segment of the senior population, the risk can increase. This is primarily due to a variety of age-related physiological changes that can disrupt the delicate balance system, making them feel motion sick more easily.
Why Some Seniors Are More Susceptible
Several factors contribute to an increased risk of motion sickness in some older adults:
- Changes in the Vestibular System: The vestibular system, located in the inner ear, is crucial for balance and sensing motion. With age, the delicate hair cells and fluid-filled structures in this system can deteriorate, reducing its effectiveness. This can lead to a less accurate perception of motion and position, which may either decrease overall sensitivity for some or, in others, create greater confusion and motion sickness. Conditions like Meniere's disease, which involves fluid buildup in the inner ear, also become more prevalent and can trigger severe episodes of vertigo and nausea.
- Visual System Changes: Vision plays a significant role in balance and motion perception. Conditions like cataracts or age-related macular degeneration can create visual discrepancies, sending conflicting signals to the brain. Furthermore, a condition called Binocular Vision Dysfunction (BVD), where a slight eye misalignment strains eye muscles, can lead to chronic motion sickness-like symptoms. The visual input from a moving environment, like scenery rushing by outside a car, becomes harder for the brain to reconcile with the body's internal sense of stability.
- Proprioceptive Decline: Proprioception is the body's awareness of its position in space. Age-related changes in the sensory nerves of the joints, muscles, and spine can weaken this sense. This can reduce the brain's ability to cross-reference movement information, compounding the sensory conflict that causes motion sickness.
- Medications and Health Conditions: Many medications common in older age, such as certain antidepressants, blood pressure drugs, and antibiotics, can have side effects that include dizziness or affect the inner ear. Additionally, medical conditions like diabetes, stroke, and Parkinson's disease can impact balance and neurological function, increasing vulnerability to motion sickness.
The Difference Between Motion Sickness and Vertigo
It's important to distinguish motion sickness from vertigo, as both can cause dizziness and nausea but have different underlying causes.
Feature | Motion Sickness | Vertigo |
---|---|---|
Cause | Conflict between visual and vestibular signals. | Problem within the inner ear or brain causing a false sensation of motion. |
Trigger | Travel in vehicles, boats, airplanes, or immersive virtual reality. | Often triggered by specific head movements, inner ear infections, or other underlying conditions. |
Sensation | Queasiness, nausea, dizziness, cold sweats. | A sensation of spinning or whirling, as if the world is moving around you. |
Management | Focusing on the horizon, medication, fresh air, limiting head movement. | Repositioning maneuvers (e.g., Epley maneuver), medication specific to the underlying cause. |
Managing Motion Sickness in Older Adults
For seniors experiencing increased motion sickness, several strategies can help manage and reduce symptoms:
- Select the Right Seat: In a car, the front seat is often best for viewing the horizon. On a plane, seats over the wing experience the least motion. On a boat, choose a cabin near the water level and toward the center.
- Focus on a Fixed Point: Staring at a distant, stationary object, such as the horizon, can help resynchronize the visual and vestibular systems. Avoid reading or looking at screens, which can worsen the sensory conflict.
- Use Behavioral Techniques: Acclimatizing to motion gradually, if possible, can help the brain adapt. Minimizing head movement by resting it against the seat can also be effective.
- Consider Medications: First-generation antihistamines like dimenhydrinate (Dramamine) and meclizine (Antivert) can be effective, though they may cause drowsiness. Scopolamine patches are another option but require a prescription and careful consultation with a doctor due to potential side effects. Always discuss medications with a healthcare provider.
- Explore Complementary Therapies: While evidence is mixed, some people find relief with alternative remedies. Ginger, in capsules or tea, is a popular natural anti-nausea remedy. Acupressure wristbands are also used, though their efficacy varies among individuals.
- Maintain Good Health: A balanced diet, adequate sleep, and avoiding alcohol and heavy meals before travel can help. Good hydration is also crucial for preventing dehydration, which can worsen symptoms.
Conclusion
While motion sickness susceptibility often decreases in old age, it's not a universal rule. Age-related changes affecting the inner ear and vision, combined with medications and other health issues, can make some seniors more prone to the condition. Understanding these factors and implementing management strategies can help older adults travel and move through daily life more comfortably. Consulting a healthcare provider is essential to rule out other medical conditions and find the best approach for managing symptoms. You can learn more about general motion sickness prevention from the Centers for Disease Control and Prevention(https://www.cdc.gov/yellow-book/hcp/travel-air-sea/motion-sickness.html).