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Counterregulatory hormones oscillate during steady-state hypoglycemia
1Department of Medicine and Pediatrics, Harbor-University of California Los Angeles Medical Center, Torrance 90509, California, USA.
The American Journal of Physiology
|November 14, 1998
Summary
Hypoglycemia counterregulation involves pulsatile hormone release and symptoms, even with stable glucose levels. This hormonal pulsatility influences the body's response during low blood sugar.
Area of Science:
- Endocrinology
- Neuroscience
- Metabolic Research
Background:
- Counterregulatory responses to hypoglycemia are crucial for glucose homeostasis.
- Clinical observations suggest symptom variability during steady-state hypoglycemia, independent of glucose levels.
Purpose of the Study:
- To investigate the hypothesis that hormonal and symptomatic responses to hypoglycemia exhibit pulsatility.
- To analyze the dynamic nature of counterregulation during sustained low blood glucose.
Main Methods:
- Seven healthy subjects underwent insulin-induced hypoglycemia.
- Serial blood sampling at 3-minute intervals for 90 minutes.
- Analysis of plasma glucose, counterregulatory hormones (glucagon, epinephrine, norepinephrine), and symptom scores.
Main Results:
- Plasma glucose stabilized at 62 +/- 3 mg/dl.
- Counterregulatory hormones (glucagon, epinephrine, norepinephrine) showed significant, pulsatile elevations.
- Hormonal pulses occurred with large amplitudes and distinct interpeak intervals.
- Symptom scores and cardiovascular responses were also pulsatile, coinciding with epinephrine peaks.
Conclusions:
- Hormonal and symptomatic counterregulation during hypoglycemia is influenced by endogenous pulsatility, independent of steady-state glucose concentrations.
- This pulsatility plays a role in the dynamic counterregulatory response to low blood glucose.