Related Experiment Videos
Sympathetic outflow in human muscle nerves increases during hypoglycemia
Diabetes
|October 1, 1986
Summary
Insulin-induced hypoglycemia activates the sympathetic nervous system, increasing muscle nerve sympathetic activity (MSA). This response, observed even in adrenalectomized subjects, mirrors the blood glucose drop, aiding hemodynamic adjustments.
Area of Science:
- Neuroscience
- Endocrinology
- Physiology
Background:
- Insulin-induced hypoglycemia mimics sympathetic nervous system activation.
- The role of muscle nerve sympathetic activity (MSA) in this response is not fully understood.
Purpose of the Study:
- To investigate the impulse pattern of muscle nerve sympathetic activity (MSA) during insulin-induced hypoglycemia.
- To determine if MSA changes are directly linked to blood glucose levels.
Main Methods:
- Microneurography was used to record peroneal nerve MSA in healthy and adrenalectomized subjects.
- Subjects received insulin to induce hypoglycemia, and MSA was monitored for 90 minutes.
Main Results:
- All subjects showed increased MSA, peaking at the lowest blood glucose level (nadir).
- The MSA increase mirrored the blood glucose decline, suggesting a direct relationship.
Conclusions:
- Muscle nerve sympathetic activity (MSA) increases during hypoglycemia, independent of adrenal function.
- This MSA activation may contribute to hemodynamic adjustments or result from central sympathetic stimulation.