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Updated: Jan 20, 2026
A Rapidly Incremented Tethered-Swimming Maximal Protocol for Cardiorespiratory Assessment of Swimmers
Published on: January 28, 2020
A standardized, incremental protocol to increase human tolerance to the cross-coupled illusion
Kathrine N Bretl1, Sage O Sherman1, Jordan B Dixon1
1University of Colorado at Boulder, 3775 Discovery Dr., Boulder, CO, USA.
Personalized protocols significantly improve adaptation to the Coriolis cross-coupled illusion, reducing motion sickness compared to standardized methods. This is crucial for implementing artificial gravity during spaceflight.
Area of Science:
- Space Medicine
- Human Physiology
- Vestibular System
Background:
- Humans can adapt to the Coriolis cross-coupled illusion with repeated exposure.
- This adaptation improves tolerance to faster spin rates.
- This enables short-radius, intermittent centrifugation for artificial gravity.
Purpose of the Study:
- To assess the importance of personalization in adapting to the Coriolis cross-coupled illusion.
- To compare a standardized, non-personalized protocol with a previously effective personalized protocol.
Main Methods:
- A standardized protocol was developed using a median stimulus sequence from a prior personalized protocol.
- Subjects underwent 10 sessions, each 25 minutes long.
- Spin rate increased incrementally, irrespective of illusion reporting.
Main Results:
- The standardized protocol led to significantly reduced acclimation (11.8 RPM threshold vs. 17.7 RPM for personalized).
- Motion sickness reports increased with the standardized protocol (1.98/20 vs. 1.08/20 for personalized).
- The standardized approach showed less variance in subject acclimation.
Conclusions:
- Personalization is critical for effective acclimation to the Coriolis illusion.
- Findings are vital for concurrent astronaut acclimation in resource-limited space missions.
- Feasibility of fast-spin, short-radius centrifugation is key for artificial gravity in spaceflight.
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