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Journal of Experimental Biology 145,283-301 (1989)
Published by Company of Biologists 1989

Role of the Telencephalon in the Synchronization of Locomotor and Respiratory Frequencies During Walking in Canada Geese

GREGORY D. FUNK ¹, WILLIAM MILSOM ¹, GERALD N. SHOLOMENKO ¹, and JOHN D. STEEVES ¹

¹ Department of Zoology, University of British Columbia, Vancouver, BC, V6T 2A9, Canada

To elucidate the importance of telencephalic structures and the effects of metabolic rate in the production of locomotor-respiratory coupling, we examined the relationship between locomotor and ventilatory patterns in: (1) intact trained geese, and (2) brainstem-stimulated (medullary reticular formation) decerebrate geese, that were walking on a treadmill. The decerebrate geese, however, were not completely self supporting. Thus, while the two groups walked with similar stride frequencies (fs), they did so at two different work rates.

While at rest, tidal volume (VT), breathing frequency (fv) and minute ventilation (VE) were very similar in the two groups. VE increased 120% during walking in the intact geese, primarily as a result of increases VE, while both VT and fv increased to produce a smaller 40 % increase in VE in the decerebrate birds. Although the magnitude of the increase in VE was three times greater in the intact geese, the relationships between VE and oxygen uptake (VO₂) and VE and CO₂ output (V_COCO2) were similar in the two groups.

Significant coupling between locomotor and respiratory patterns was found in both intact (28.3%) and decerebrate birds (28.9%), suggesting that the telencephalon is not essential for the coupling of locomotor and respiratory rhythms during walking in geese. In addition, the incidence of locomotor-respiratory synchrony was virtually identical in the two groups in spite of a threefold difference in metabolic work rate.

Key words: locomotor-ventilatory coupling, entrainment, exercise hyperpnea, ventilatory control, medullary reticular formation, avian locomotion, goose

Accepted on April 17, 1989

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