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Related Experiment Video

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Combining Transcranial Magnetic Stimulation and fMRI to Examine the Default Mode Network
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Menopausal hot flashes and the default mode network.

Rebecca C Thurston1, Pauline M Maki2, Carol A Derby3

  • 1Department of Psychiatry, University of Pittsburgh, Pittsburgh, Pennsylvania.

Fertility and Sterility
|April 26, 2015
PubMed
Summary
This summary is machine-generated.

More frequent hot flashes in midlife women are linked to increased brain connectivity in the default mode network (DMN), especially in areas supporting the hippocampus. This connection is more significant during sleep.

Keywords:
Hot flashesbraindefault mode networkhippocampusvasomotor symptoms

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Area of Science:

  • Neuroscience
  • Menopause Research
  • Brain Imaging

Background:

  • Hot flashes are a common menopausal symptom with unclear underlying mechanisms.
  • The default mode network (DMN) is a set of brain regions active during rest.
  • The hippocampus, rich in estrogen receptors, is implicated in hot flash regulation.

Purpose of the Study:

  • To investigate the association between objectively measured hot flashes and DMN connectivity.
  • To specifically examine DMN networks supporting the hippocampus in relation to hot flashes.

Main Methods:

  • Twenty midlife women (40-60 years) without hormone therapy underwent 24-hour physiologic hot flash monitoring.
  • Functional magnetic resonance imaging (fMRI) assessed DMN functional connectivity.
  • Data were analyzed controlling for age, race, education, sleep, depressive symptoms, and estrogen levels.

Main Results:

  • Increased physiologically monitored hot flashes correlated with greater DMN connectivity.
  • This association was particularly pronounced in DMN networks supporting the hippocampus.
  • Findings were strongest for sleep-related hot flashes, showing a significant link with hippocampal DMN connectivity.

Conclusions:

  • Greater DMN connectivity, especially in hippocampal networks, is associated with more frequent hot flashes.
  • Sleep hot flashes exhibit the strongest association with hippocampal DMN connectivity.
  • These findings highlight the central nervous system's role in menopausal hot flashes, warranting further investigation.