Document Detail


Effect of abdominal strapping on chest wall mechanics during exercise in patients with severe chronic air-flow obstruction.
MedLine Citation:
PMID:  4003929     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We studied the effect of abdominal loading on exercise performance in 7 patients with severe chronic air-flow obstruction (CAO). The patients were exercised to exhaustion on a bicycle ergometer at a work rate equivalent to 80% of their maximal work rate. Three exercise studies were completed in the same afternoon. The first and third were control studies; in the second, the abdomen was strapped with a belt that was secured after the patient had expired below FRC. Neither TLC (p greater than 0.3) nor FRC (p greater than 0.05) were altered by strapping. Exercising with the abdomen strapped resulted in a 40% increase in transdiaphragmatic pressure (Pdi) (p less than 0.005), but neither the peak inspiratory pleural pressure relative to the relaxation curve nor the minute ventilation differed from those of the control study (p greater than 0.7). Nevertheless, strapped exercise endurance (119 +/- 27 s) was significantly lower than control endurance (154 +/- 35 s; p less than 0.01). Because of the increase in Pdi, the computed tension-time index of the diaphragm increased from a control value of 0.13 +/- 0.05 to 0.20 +/- 0.06 (p less than 0.05) when strapped. However, neither the pleural pressure nor the Pdi swings decreased during the last 30 s of the runs, indicating that inspiratory muscle fatigue was not the basis for the reduced endurance when the abdomen was strapped. Strapping the abdomen may improve the length-tension relationship of the diaphragm at a given lung volume, and the increased Pdi suggests improved diaphragmatic function.(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
D S Dodd; T P Brancatisano; L A Engel
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American review of respiratory disease     Volume:  131     ISSN:  0003-0805     ISO Abbreviation:  Am. Rev. Respir. Dis.     Publication Date:  1985 Jun 
Date Detail:
Created Date:  1985-07-23     Completed Date:  1985-07-23     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0370523     Medline TA:  Am Rev Respir Dis     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  816-21     Citation Subset:  AIM; IM; S    
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MeSH Terms
Descriptor/Qualifier:
Abdomen*
Aged
Biomechanics
Functional Residual Capacity
Humans
Immobilization*
Lung Diseases, Obstructive / physiopathology*
Middle Aged
Physical Exertion*
Posture
Pressure
Respiration
Thorax / physiopathology*
Time Factors
Total Lung Capacity

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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