PMID- 1559587
OWN - NLM
STAT- MEDLINE
DCOM- 19920513
LR  - 20130523
IS  - 0903-1936 (Print)
IS  - 0903-1936 (Linking)
VI  - 5
IP  - 2
DP  - 1992 Feb
TI  - Vector analysis in partitioning of inspiratory muscle action in dogs.
PG  - 219-27
AB  - We considered the displacements and the pressure changes resulting from isolated 
      contraction of 2 muscles as analogous to 2 vectors and those during simultaneous 
      contraction as resultants. These were resolved into contributing components to 
      calculate the contribution of each muscle group and partition the action of 
      inspiratory muscles. Relative displacements of rib cage (delta RC) and abdomen 
      (delta AB) and changes in transpulmonary (delta PL) and abdominal (delta Pab) 
      pressures were obtained during spontaneous breathing, isolated contraction of rib 
      cage muscle (RCM), diaphragmatic (DI), costal and crural diaphragm and passive 
      inflation in 7 dogs. The diaphragm accounted for 58 +/- 19.8% SD of the chest 
      wall displacement and 90 +/- 6.6% SD of the pressure swings during spontaneous 
      breathing. The costal diaphragm accounted for 61 +/- 28.9% SD of the displacement 
      produced by contraction of the entire diaphragm. Despite wide variability in the 
      action of the diaphragm and its components, all animals breathed close to their 
      relaxation characteristic. We conclude that there are marked differences in the 
      degree of RCM recruitment between dogs in order to prevent chest wall 
      distortions.
FAU - Ward, M E
AU  - Ward ME
AD  - Meakins-Christie Laboratories, McGill University, Montreal, Canada.
FAU - Paiva, M
AU  - Paiva M
FAU - Macklem, P T
AU  - Macklem PT
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - England
TA  - Eur Respir J
JT  - The European respiratory journal
JID - 8803460
SB  - IM
MH  - Animals
MH  - Diaphragm/*physiology
MH  - Dogs
MH  - Inspiratory Capacity/*physiology
MH  - Mathematics
MH  - Muscle Contraction/*physiology
MH  - Pressure
MH  - Respiration
MH  - Respiratory Muscles/physiology
EDAT- 1992/02/01 00:00
MHDA- 1992/02/01 00:01
CRDT- 1992/02/01 00:00
PHST- 1992/02/01 00:00 [pubmed]
PHST- 1992/02/01 00:01 [medline]
PHST- 1992/02/01 00:00 [entrez]
PST - ppublish
SO  - Eur Respir J. 1992 Feb;5(2):219-27.