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Expiratory effects of cerebellar stimulation in developing opossums
The American Journal of Physiology
|June 1, 1987
Summary
Cerebellar stimulation during positive-pressure breathing suppressed expiratory muscle activity and prolonged exhalation in young opossums. This suggests the cerebellum plays a role in coordinating breathing and movement.
Area of Science:
- Neuroscience
- Respiratory Physiology
- Developmental Biology
Background:
- Positive-pressure breathing (PPB) induces expiratory muscle activation in developing opossums.
- These respiratory responses emerge around postnatal day 30 and mature over several weeks.
Purpose of the Study:
- To investigate the impact of cerebellar stimulation on respiratory timing and muscle activity during PPB.
- To analyze age-dependent effects of cerebellar stimulation in young opossums.
Main Methods:
- Constant-current cerebellar stimulation applied during a single breath in anesthetized opossums (30 days to weaning).
- Electromyogram (EMG) recordings from abdominal (ABD) and intercostal (IC) muscles.
- Analysis of respiratory phase and muscle activity modulation.
Main Results:
- Deep cerebellar nuclei stimulation exhibited expiration-phased effects, suppressing ABD and IC muscle EMGs.
- Inhibition of ABD muscles was generally greater than IC muscles.
- Cerebellar stimulation consistently prolonged the expiratory phase of breathing.
- Lower stimulation frequencies were required for maximum expiratory prolongation in younger animals.
Conclusions:
- Cerebellar stimulation influences expiratory muscle activity and respiratory timing during PPB.
- Differential modulation of ABD and IC muscle activity suggests distinct cerebellar pathways.
- Findings support a role for the cerebellum in coordinating respiratory and non-respiratory motor functions.