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An Overview of the Endocrine System01:10

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The endocrine system, a complex network of glands, orchestrates physiological balance within the body through the production and secretion of hormones. These hormones are chemical messengers in intercellular communication, acting as conduits between the secretory cells and distant target sites. They traverse the circulatory system by being released into the extracellular fluid, and their impact is specific to cells possessing receptors for a particular hormone.
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Automated Multimodal Stimulation and Simultaneous Neuronal Recording from Multiple Small Organisms
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Neuroendocrine System Adaptation during Consecutive Extrinsic Stimuli: A Pilot Dynamic Study.

Styliani A Geronikolou1,2,3, Vasilis Vasdekis4, Aimilia Mantzou2

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Children (Basel, Switzerland)
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PubMed
Summary

Low-level inflammation and baseline cortisol do not affect autonomic nervous system (ANS) dynamics in children. However, they influence the hypothalamic-pituitary-adrenal (HPA) axis response to stress.

Keywords:
HPA axisTrier Social Stress Test for Childrencell phone callelectromagnetic fieldsheart ANSlow-level inflammationnon-linear dynamicssample entropy

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Area of Science:

  • Psychoneuroimmunology
  • Stress Physiology
  • Pediatric Health

Background:

  • The autonomic nervous system (ANS) and hypothalamic-pituitary-adrenal (HPA) axis regulate stress responses.
  • Low-level inflammation may influence these systems, particularly in children.
  • Understanding these interactions is crucial for pediatric health.

Purpose of the Study:

  • To evaluate the dynamics of the ANS and HPA axis in schoolchildren during consecutive stressors.
  • To investigate the interplay between the ANS, HPA axis, and low-level inflammation.
  • To assess the impact of extrinsic stimuli on stress response systems in adolescents.

Main Methods:

  • A pilot study involving 20 healthy schoolchildren (11-14 years) exposed to oral, arithmetic, and phone call stressors.
  • Salivary cortisol and serum high-sensitivity C-reactive protein (hsCRP) were measured.
  • Autonomic nervous system (ANS) complexity was assessed using Sample Entropy (SampEn).

Main Results:

  • Baseline hsCRP and cortisol showed a negative correlation.
  • ANS and HPA axis responses varied across the three consecutive stimuli.
  • ANS adaptation involved complexity modulation, weakening with the third stimulus.
  • Baseline hsCRP and cortisol influenced HPA axis response, but not ANS dynamics.

Conclusions:

  • Low-level inflammation and baseline cortisol do not impact ANS dynamics in children.
  • These factors, however, modulate the HPA axis response to repeated stressors.
  • The study highlights distinct regulatory mechanisms for ANS and HPA axis under stress in youth.