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Related Experiment Videos

Phase-shifting human circadian rhythms with exercise during the night shift

C I Eastman1, E K Hoese, S D Youngstedt

  • 1Biological Rhythms Research Laboratory, Rush-Presbyterian-St. Luke's Medical Center, Chicago, IL 60612, USA.

Physiology & Behavior
|December 1, 1995
PubMed
Summary

Exercise during night shifts can help shift human circadian rhythms, promoting better alignment with daytime sleep schedules. This intervention aids adaptation to shift work, regardless of an individual's natural sleep preference.

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Area of Science:

  • Chronobiology
  • Human physiology
  • Sleep science

Background:

  • Circadian rhythms regulate physiological processes, influencing sleep-wake cycles.
  • Night shift work disrupts natural circadian rhythms, leading to sleep disturbances and health issues.
  • Exercise timing is known to influence circadian phase shifting in animal models.

Purpose of the Study:

  • To investigate if exercise performed during night shifts can induce a phase delay in human circadian temperature rhythms.
  • To assess if this exercise-induced phase delay can help align circadian rhythms with a desired daytime sleep schedule.
  • To determine the effectiveness of exercise in facilitating circadian adaptation for night shift workers.

Main Methods:

  • Eight night shift workers exercised (15 min/h on a cycle ergometer) during the first 3 of 8 shifts; eight controls remained sedentary.

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  • Subjects used dark welder's goggles post-shift and slept in dark bedrooms to promote sleep.
  • Core body temperature was continuously monitored to track circadian rhythm phase shifts.

    • Main Results:

    • A higher percentage of the exercise group (63%) exhibited significant phase delay shifts (>6 hours) compared to the control group (38%).
    • Analysis revealed that the exercise group had a significantly larger temperature rhythm phase shift, even after accounting for morningness-eveningness traits.
    • Exercise facilitated phase shifts irrespective of participants' chronotype (morning-type vs. evening-type), unlike in the control group.

    Conclusions:

    • Exercise performed during night shifts is an effective strategy for promoting phase delay of human circadian temperature rhythms.
    • This exercise intervention can aid in adapting to night shift work and aligning circadian rhythms with daytime sleep.
    • Exercise offers a potential non-pharmacological tool to mitigate the circadian challenges associated with shift work.