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Related Experiment Videos

Using outdoor exercise to decrease jet lag in airline crewmembers

M Shiota1, M Sudou, M Ohshima

  • 1Laboratory of Biomechanics and Physiology, Faculty of Liberal Arts, Yamaguchi University, Japan.

Aviation, Space, and Environmental Medicine
|December 1, 1996
PubMed
Summary
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Outdoor exercise aids circadian rhythm resynchronization in pilots. Engaging in physical activity after jet travel helps reset the body

Area of Science:

  • Chronobiology
  • Aerospace Medicine
  • Human Physiology

Background:

  • Circadian rhythm disruption is common in aircrew due to jet travel.
  • Jet lag affects physiological markers like 17-hydroxycorticosteroids (17-OHCS) and sleep-wake patterns.
  • Resynchronization to new time zones is crucial for crew well-being and performance.

Purpose of the Study:

  • To investigate the impact of outdoor exercise on circadian rhythm adjustment in cockpit crewmembers.
  • To compare the effects of outdoor exercise versus a sedentary control condition on physiological markers after trans-Pacific travel.
  • To assess the influence of exercise on the timing of urinary 17-OHCS excretion and sleep-wake patterns.

Main Methods:

  • A study involving cockpit crewmembers traveling from Tokyo to Los Angeles (8-h time difference).

Related Experiment Videos

  • Measurement of urinary 17-hydroxycorticosteroids (17-OHCS) and sleep-wake patterns before and after travel.
  • Comparison between an exercise group (outdoor activity) and a control group (indoor activities) post-flight.

    • Main Results:

    • Both groups showed initial phase advance in 17-OHCS rhythm and sleep-wake patterns upon arrival.
    • The exercise group exhibited a tendency for delayed 17-OHCS acrophase on day 3, followed by phase advance on day 4.
    • Significant differences (p < 0.01) in 17-OHCS acrophase timing were observed between groups on day 4, favoring the exercise group.

    Conclusions:

    • Outdoor exercise appears to facilitate the resynchronization of the circadian rhythm of urinary 17-OHCS excretion to a new time zone.
    • Physical activity may play a role in mitigating jet lag effects for aircrew.
    • Exposure to natural light and physical exertion could be beneficial for circadian adaptation in travelers.