A Laboratory Study of the Effects of Diet and Bright Light Countermeasures to Jet Lag
Abstract
The ability of diet or bright light to prevent or alleviate jet lag was tested by simulating a 6-hour easterly time zone shift. Twenty-three male Marines lived in individual, time-isolation apartments for 15 consecutive days. Diet group subjects were put on a popularized 'jet lag diet' (high protein breakfast, high carbohydrate dinners, scheduled caffeine consumption) for 4 days prior to the shift. Light group subjects were exposed to bright (2500 lux), full-spectrum light on the first 4 mornings after the shift. Control group subjects were maintained on a mixed nutrient, balanced diet and were exposed only to ambient light. All of the subjects experienced jet lag as evidenced by disruption in sleep patterns and body temperature rhythms. Decrements in mood, performance, and levels of physical activity were also noted. The 'jet lag diet' actually worsened sleep and did not lessen or promote recovery from other jet lag symptoms. The bright light treatment showed the most promise for future use in that, after 2-3 treatments, Light group subjects tended to be more alert and happier than before the shift as well as more alert and happier than Diet and Control group subjects. However, the light regimen hindered temperature rhythm resynchronization and sleep. Additional research is needed to determine if these undesirable effects can be reduced or eliminated by modifying the intensity of the bright light and/or the timing of the treatment. Keywords: Jet lag; Countermeasures; Jet lag diet; Bright light; Body temperature; Sleep; Alertness; Mood; Performance; Exercise.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1990
- Accession Number
- ADA220148
Entities
People
- C. A. Salter
- C. P. Pollak
- E. Hirsch
- L. S. Lester
- M. L. Moline
- S. Zendell
Organizations
- Weill Cornell Medical Center