Diaphragm motor unit recruitment during ventilatory and nonventilatory behaviors

Gary C Sieck, M. Fournier

Research output: Contribution to journalArticle

159 Citations (Scopus)

Abstract

The forces generated by the cat diaphragm (DIA) during different ventilatory and nonventilatory behaviors were determined by measuring transdiaphragmatic pressures (Pdi). The Pdi generated during eupnea was only ~12% of the maximum Pdi (Pdi(max)) generated by bilateral phrenic nerve stimulation. When the animals breathed a gas mixture of 10% O2 and 5% CO2, the Pdi increased to ~28% of Pdi(max). During total airway occlusion, the Pdi generated by the diaphragm increased to ~49% of Pdi(max). Only during the gag reflex and sneezing did Pdi reach maximal levels. A model for diaphragm motor unit recruitment during these different behaviors was presented based on the proportion of different motor unit types within the diaphragm, the relative tetanic tensions produced by each unit type, and the assumption of an orderly pattern of motor unit recruitment.

Original languageEnglish (US)
Pages (from-to)2539-2545
Number of pages7
JournalJournal of Applied Physiology
Volume66
Issue number6
StatePublished - 1989
Externally publishedYes

Fingerprint

Neurophysiological Recruitment
Diaphragm
Sneezing
Phrenic Nerve
Reflex
Cats
Gases
Pressure

ASJC Scopus subject areas

  • Endocrinology
  • Physiology
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Diaphragm motor unit recruitment during ventilatory and nonventilatory behaviors. / Sieck, Gary C; Fournier, M.

In: Journal of Applied Physiology, Vol. 66, No. 6, 1989, p. 2539-2545.

Research output: Contribution to journalArticle

Sieck, Gary C ; Fournier, M. / Diaphragm motor unit recruitment during ventilatory and nonventilatory behaviors. In: Journal of Applied Physiology. 1989 ; Vol. 66, No. 6. pp. 2539-2545.
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