Document Detail


Effects of different expiratory maneuvers on inspiratory muscle force output.
MedLine Citation:
PMID:  10051268     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We assessed the effects of two different expiratory maneuvers (fast [F] or slow [S]) on the ability of normal subjects (n = 12, age 35 +/- 6 yr) to generate maximal inspiratory pressures and maximal inspiratory flows near residual volume (RV). With the F maneuver, the subject exhaled rapidly to RV and immediately performed a maximal inspiratory effort, whereas with the S maneuver the subject exhaled slowly to RV, paused for 4 to 6 s at RV, and then inspired forcefully. Maximal static inspiratory pressure against an occluded airway (PImax), and maximal dynamic inspiratory pressure (PIdyn) and maximal inspiratory flow (V Imax) with no added resistance, as well as the electromyographic activity of the parasternal muscles, were measured during each maneuver. Both maneuvers were initiated from TLC and were performed randomly. In comparison with the S maneuver, the F maneuver yielded values of higher (mean +/- SE) PImax (148 +/- 5 cm H2O versus 135 +/- 7 cm H2O, p < 0.05), PIdyn (33 +/- 2 cm H2O versus 28 +/- 2 cm H2O, p < 0.05), and V Imax (12.3 +/- 0.4 L/s versus 11.4 +/- 0.6 L/s, p < 0.05). In addition, the rate of rise of PImax, the rate of rise of PIdyn, and the integrated peak electromyographic activity of the parasternal muscles were significantly greater with the F than with the S maneuver, suggesting greater inspiratory muscle (IM) activation. The enhanced IM activation may be related to a specific inspiratory-expiratory muscle interaction similar to the agonist-antagonist interactions described for a pair of skeletal muscles.
Authors:
S Zakynthinos; T Vassilakopoulos; A Mavrommatis; C Roussos; G E Tzelepis
Related Documents :
3081468 - The effect of hyperinflation, inspiratory hold, and oxygenation on cardiopulmonary stat...
21125058 - Should practitioners promote physical activity as a treatment for depression?
1185678 - Breathing in man during steady-state exercise on the bicycle at two pedalling frequenci...
23838278 - Lactate metabolism during exercise in patients with mitochondrial myopathy.
18471448 - Effect of cardiac rehabilitation on myocardial perfusion reserve in postinfarction pati...
1554158 - Stresses induced by edgewise appliances in the periodontal ligament--a finite element s...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of respiratory and critical care medicine     Volume:  159     ISSN:  1073-449X     ISO Abbreviation:  Am. J. Respir. Crit. Care Med.     Publication Date:  1999 Mar 
Date Detail:
Created Date:  1999-04-01     Completed Date:  1999-04-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9421642     Medline TA:  Am J Respir Crit Care Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  892-5     Citation Subset:  AIM; IM    
Affiliation:
Pulmonary Services and Intensive Care Units, Evangelismos Hospital and Onassis Cardiac Center, University of Athens Medical School, Athens, Greece.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adult
Electromyography
Humans
Male
Muscle Contraction
Pulmonary Ventilation*
Residual Volume
Respiratory Muscles / physiology*
Total Lung Capacity

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


Previous Document:  Determinants of rib motion in flail chest.
Next Document:  Aerobic and strength training in patients with chronic obstructive pulmonary disease.