Motion Sickness from Combined Lateral and Roll Oscillation: Effect of Varying Phase Relationships
Joseph JA, Griffin MJ. Motion sickness from combined lateral and roll oscillation: effect of varying phase relationships. Aviat Space Environ Med 2007; 78:944–50.
Background: Previous studies have investigated motion sickness caused by combined lateral and roll oscillation occurring in phase with each other. In tilting trains there can be a phase difference between the two motions.
Hypothesis: It was hypothesized that sickness caused by combined lateral and roll oscillation would depend on the phase between the lateral acceleration and the roll displacement.
Method: At intervals of at least 1 wk, 20 subjects were seated in a cabin and exposed to four 30-min exposures of combined 0.2 Hz sinusoidal lateral acceleration (± 1.26 ms−2) and 0.2 Hz roll displacement (± 7.32°). The roll oscillation had one of four phases relative to the lateral oscillation: 1) 0° delay (giving 100% compensation of the lateral acceleration); 2) 14.5° delay (75% compensation); 3) 29° delay (50% compensation); and 4) 29° advance (50% compensation). Subjects gave ratings of sickness at 1-min intervals.
Results: Sickness was greatest with no delay (100% compensation). Increasing the delay to 14.5° (75% compensation) and to 29° (50% compensation) decreased sickness. Less sickness occurred when the roll displacement led the lateral acceleration by 29° (phase advance) than when the roll displacement followed the lateral acceleration by 29° (phase delay).
Conclusions: With combined lateral and roll oscillation, sickness depends on the phase between the two motions. Increasing the delay in the roll motion reduces sickness, but also reduces the compensation. There is less sickness when the roll displacement leads the lateral acceleration than when the roll displacement lags the lateral acceleration.
Background: Previous studies have investigated motion sickness caused by combined lateral and roll oscillation occurring in phase with each other. In tilting trains there can be a phase difference between the two motions.
Hypothesis: It was hypothesized that sickness caused by combined lateral and roll oscillation would depend on the phase between the lateral acceleration and the roll displacement.
Method: At intervals of at least 1 wk, 20 subjects were seated in a cabin and exposed to four 30-min exposures of combined 0.2 Hz sinusoidal lateral acceleration (± 1.26 ms−2) and 0.2 Hz roll displacement (± 7.32°). The roll oscillation had one of four phases relative to the lateral oscillation: 1) 0° delay (giving 100% compensation of the lateral acceleration); 2) 14.5° delay (75% compensation); 3) 29° delay (50% compensation); and 4) 29° advance (50% compensation). Subjects gave ratings of sickness at 1-min intervals.
Results: Sickness was greatest with no delay (100% compensation). Increasing the delay to 14.5° (75% compensation) and to 29° (50% compensation) decreased sickness. Less sickness occurred when the roll displacement led the lateral acceleration by 29° (phase advance) than when the roll displacement followed the lateral acceleration by 29° (phase delay).
Conclusions: With combined lateral and roll oscillation, sickness depends on the phase between the two motions. Increasing the delay in the roll motion reduces sickness, but also reduces the compensation. There is less sickness when the roll displacement leads the lateral acceleration than when the roll displacement lags the lateral acceleration.
Keywords: compensation; lateral; motion sickness; oscillation; roll
Document Type: Research Article
Affiliations: From the Human Factors Research Unit, Institute of Sound and Vibration Research, University of Southampton, Southampton, UK.
Publication date: 01 October 2007
- The peer-reviewed monthly journal, Aviation, Space, and Environmental Medicine (ASEM) provides contact with physicians, life scientists, bioengineers, and medical specialists working in both basic medical research and in its clinical applications. It is the most used and cited journal in its field. ASEM is distributed to more than 80 nations.
To access volumes 86 to present, please click here. - Information for Authors
- Submit a Paper
- Subscribe to this Title
- Membership Information
- Information for Advertisers
- Submit Articles
- Ingenta Connect is not responsible for the content or availability of external websites
- Access Key
- Free content
- Partial Free content
- New content
- Open access content
- Partial Open access content
- Subscribed content
- Partial Subscribed content
- Free trial content