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Increased glucagon secretion during hyperthermia in a sauna.
Summary
Hyperthermia in a sauna increases plasma glucagon levels in healthy males. This rise is linked to adrenergic stimulation and potentially reduced glucagon breakdown due to decreased visceral blood flow.
Area of Science:
- Endocrinology
- Human Physiology
- Thermoregulation
Background:
- Hyperthermia, such as that induced by sauna use, can significantly impact metabolic hormones.
- Understanding the hormonal responses to heat stress is crucial for human physiology research.
Purpose of the Study:
- To investigate the effects of acute hyperthermia on plasma concentrations of key metabolic hormones and glucose.
- To explore the potential mechanisms, including adrenergic stimulation and blood flow changes, driving these hormonal alterations.
Main Methods:
- Measurements of plasma glucagon, adrenaline, noradrenaline, insulin, and glucose were taken in 7 healthy young males.
- Participants were exposed to hyperthermia in a controlled sauna bath environment.
Main Results:
- Plasma glucagon levels significantly increased during hyperthermia.
- Plasma insulin levels remained unchanged, while plasma glucose showed a slight increase.
- Elevated plasma catecholamine (adrenaline and noradrenaline) levels were observed concurrently.
Conclusions:
- Adrenergic stimulation is implicated as a primary driver for glucagon release during hyperthermia.
- Reduced degradation of plasma glucagon, possibly due to diminished visceral blood flow in sauna conditions, may contribute to elevated levels.