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Background <p>Nocturnal core body temperature (CBT) decline is reflected in decreasing heart rate (HR) and is linked to sleep stage distribution, a&#xa0;relationship which is influenced by age and subject to temperature manipulation.</p> Objective <p>The present study investigates the relationship between CBT, HR, and sleep stage distribution by comparing two studies with healthy males: young and middle-aged men. The aim is to examine how these physiological systems might be interrelated.</p> Materials and methods <p>Data from two independent studies were compared to examine nocturnal sleep stages, CBT, and HR time courses.</p> Results <p>The findings revealed that younger men exhibited improved sleep consolidation, characterized by longer total sleep time and more slow-wave (SWS) and REM sleep, along with a&#xa0;sustained nocturnal decline in CBT and HR. In contrast, middle-aged men exhibited poorer sleep continuity and a&#xa0;less-pronounced decline in CBT, followed by an earlier rise. The CBT changes were reflected in HR.</p> Conclusion <p>These results suggest that the nocturnal profile of CBT may be linked to variations in HR and fluctuations in sleep stage distribution. Interventions that facilitate nocturnal heat loss and a&#xa0;reduction in CBT and HR could potentially support sleep quality across age groups, particularly regarding SWS.</p>

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Effects of nocturnal decline in core body temperature and heart rate on sleep: a comparative study of two age groups

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月4日

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  • Sebastian Herberger,
  • Katharina Lederer,
  • Alessandro Cicolin,
  • Matteo Mason,
  • Martin Glos,
  • Christoph Aurnhammer,
  • Marie Neumann,
  • Thomas Penzel,
  • Ingo Fietze,
  • Kurt Kräuchi

摘要

Background

Nocturnal core body temperature (CBT) decline is reflected in decreasing heart rate (HR) and is linked to sleep stage distribution, a relationship which is influenced by age and subject to temperature manipulation.

Objective

The present study investigates the relationship between CBT, HR, and sleep stage distribution by comparing two studies with healthy males: young and middle-aged men. The aim is to examine how these physiological systems might be interrelated.

Materials and methods

Data from two independent studies were compared to examine nocturnal sleep stages, CBT, and HR time courses.

Results

The findings revealed that younger men exhibited improved sleep consolidation, characterized by longer total sleep time and more slow-wave (SWS) and REM sleep, along with a sustained nocturnal decline in CBT and HR. In contrast, middle-aged men exhibited poorer sleep continuity and a less-pronounced decline in CBT, followed by an earlier rise. The CBT changes were reflected in HR.

Conclusion

These results suggest that the nocturnal profile of CBT may be linked to variations in HR and fluctuations in sleep stage distribution. Interventions that facilitate nocturnal heat loss and a reduction in CBT and HR could potentially support sleep quality across age groups, particularly regarding SWS.