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Related Experiment Videos

Hyperglycemia affects cardiovascular autonomic nerve function in normal subjects

B B Yeap1, A Russo, R J Fraser

  • 1Department of Medicine, Royal Adelaide Hospital, North Terrace, Adelaide, Australia.

Diabetes Care
|August 1, 1996
PubMed
Summary

Acute hyperglycemia, or high blood sugar, impacts autonomic nerve function in healthy individuals. This study found increased heart rate and reduced heart rate variability during high blood sugar states.

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Area of Science:

  • Cardiovascular Physiology
  • Autonomic Nervous System Function
  • Metabolic Regulation

Background:

  • Autonomic nerve function plays a crucial role in maintaining cardiovascular homeostasis.
  • The effects of acute hyperglycemia on autonomic control in healthy individuals require further elucidation.
  • Understanding these effects is important for metabolic and cardiovascular health research.

Purpose of the Study:

  • To investigate the impact of acute hyperglycemia on autonomic nerve function in healthy human subjects.
  • To assess specific cardiovascular reflex tests under conditions of euglycemia and hyperglycemia.
  • To determine if elevated blood glucose levels alter autonomic responses.

Main Methods:

  • Paired studies were conducted on six healthy volunteers (ages 19-32).

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  • Participants underwent conditions of normal blood glucose (euglycemia) and elevated blood glucose (hyperglycemia) induced by intravenous glucose infusion.
  • Measurements included heart rate, heart rate variation with respiration, the "30:15" ratio, and blood pressure responses to standing and handgrip, analyzed via repeated measures ANOVA.

    • Main Results:

    • Supine heart rate was significantly higher during acute hyperglycemia compared to euglycemia (P=0.04).
    • The "30:15" ratio, an indicator of parasympathetic function, was significantly reduced during hyperglycemia (P=0.03).
    • No significant effects of hyperglycemia were observed on other tested cardiovascular reflex functions.

    Conclusions:

    • Acute hyperglycemia demonstrably affects autonomic nerve function in healthy humans.
    • The observed changes suggest an alteration in autonomic balance during high blood sugar states.
    • These findings highlight a potential link between transient metabolic disturbances and cardiovascular autonomic regulation.