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[Body temperature changes during 7 d -6 degrees head-down bed rest].

Xue-jun Yu1, Shao-yong Chang, De Song

  • 1Institute of Space Medico-Engineering, Beijing, China.

Hang Tian Yi Xue Yu Yi Xue Gong Cheng = Space Medicine & Medical Engineering
|September 12, 2002
PubMed
Summary
This summary is machine-generated.

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Seven-day head-down bed rest alters human body temperature. Morning temperatures decreased, while afternoon and evening temperatures increased, indicating impacts on thermal regulation.

Area of Science:

  • Physiology
  • Human thermoregulation
  • Space medicine

Context:

  • Head-down bed rest (BR) simulates microgravity effects.
  • Understanding thermal regulation changes is crucial for spaceflight and prolonged immobility.
  • Previous research has not fully detailed diurnal body temperature shifts during BR.

Purpose:

  • To investigate changes in human body temperature during a 7-day -6 degree head-down bed rest (BR).
  • To analyze variations in rectal (Tre), mean skin (Tsk), and forehead skin (Tforehead) temperatures at different times of day and during BR duration.

Summary:

  • Rectal temperature (Tre) decreased in the morning throughout BR, while increasing in the afternoon and evening.
  • Mean skin temperature (Tsk) and forehead skin temperature (Tforehead) showed significant increases in the morning, afternoon, and evening during BR.

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  • Both time of day and duration of BR significantly influenced Tre, Tsk, and Tforehead.

    • Impact:

    • Findings suggest BR-induced body fluid shifts and hypokinesis disrupt human thermal regulation.
    • These results have implications for monitoring astronaut health and managing physiological changes in immobilized individuals.
    • Highlights the importance of considering circadian rhythms and BR duration in thermal studies.