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Insulin-induced hypoglycemia: 24-h variation.

J J Gagliardino, C F Bellone, A J Angeletti

Acta Diabetologica Latina

|May 1, 1976

Summary

The timing of intravenous insulin injections significantly impacts blood glucose levels in healthy individuals. Maximum glucose-lowering effects were observed with evening and late-night injections, highlighting circadian variations in insulin response.

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Area of Science:

Endocrinology
Chronobiology
Metabolic Research

Background:

Circadian rhythms influence various physiological processes, including hormone regulation and metabolic responses.
Understanding the temporal dynamics of insulin action is crucial for optimizing glycemic control.

Purpose of the Study:

To investigate the impact of intravenous insulin administration timing on glucose levels in healthy volunteers.
To determine if circadian variations affect the magnitude and timing of insulin-induced hypoglycemia.

Main Methods:

Intravenous insulin was administered to normal volunteers at four distinct times throughout a 24-hour period.
Blood glucose levels were monitored to assess the hypoglycemic effect and recovery patterns.

Main Results:

A significant quantitative difference in glucose fall was observed based on injection time.
The most pronounced hypoglycemic effects occurred when insulin was injected at 18:00 and 24:00.
Circadian variation in insulin response was primarily linked to the rate of glucose recovery, not the nadir glucose level.

Conclusions:

The time of day for insulin administration influences its hypoglycemic efficacy.
Circadian rhythms play a critical role in modulating the body's response to insulin.
These findings emphasize the importance of considering diurnal variations in both experimental insulin studies and clinical insulin therapy.

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