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Motoneurones "learn" and "forget" physical activity.

Phillip Gardiner¹, Eric Beaumont, Bruno Cormery

¹Spinal Cord Research Center, Dept. of Physiology, University of Manitoba, Winnipeg, Manitoba, Canada.

Canadian Journal of Applied Physiology = Revue Canadienne De Physiologie Appliquee

|September 1, 2005

Summary

Alpha-motoneurones adapt their biophysical properties to chronic activity changes. These activity-dependent adaptations in motor neurons influence movement generation and exercise capacity, suggesting a form of cellular learning.

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Area of Science:

Neuroscience
Exercise Physiology
Motor Control

Background:

Limited understanding of alpha-motoneuron adaptations to chronic activity changes.
Supraspinal neurons and skeletal muscles show known activity-related adaptations.

Purpose of the Study:

Investigate the plasticity of alpha-motoneuron biophysical properties.
Determine how chronic activity alterations affect alpha-motoneurons.

Main Methods:

Analysis of changes in resting membrane potential, spike threshold, and afterhyperpolarization.
Examination of depolarization rate during spike generation.

Main Results:

Alpha-motoneurons exhibit plasticity, adapting to both increased and decreased chronic activation.

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Adaptations involve modulation of ion channel properties in the motoneuronal membrane.

Conclusions:

Motoneuron adaptations significantly impact movement generation and sustained exercise effort.
These activity-dependent changes are considered learning responses due to structural and protein synthesis involvement.