Document Detail


A chest wall restrictor to study effects on pulmonary function and exercise. 2. The energetics of restrictive breathing.
MedLine Citation:
PMID:  10202329     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Chest wall restriction, whether caused by disease or mechanical constraints such as protective outerwear, can cause decrements in pulmonary function and exercise capacity. However, the study of the oxygen cost associated with mechanical chest restriction has so far been purely qualitative. The previous paper in this series described a device to impose external chest wall restriction, its effects on forced spirometric volumes, and its test-retest reliability. The purpose of this experiment was to measure the oxygen cost associated with varied levels of external chest wall restriction. Oxygen uptake and electromyogram (EMG) of the external intercostals were recorded during chest restriction in 10 healthy males. Subjects rested for 9 min before undergoing volitional isocapnic hyperpnea for 6 min. Subjects breathed at minute ventilations (V.I) of 30, 60, and 90 liters/min with chest wall loads of 0, 25, 50 and 75 mm Hg applied. Frequency of breathing was set at 15, 30, and 45 breaths per minute with a constant tidal volume (VT) of 2 liters. Oxygen uptake was measured continuously at rest and throughout the hyperventilation bouts, while controlling V.I and VT. Integrated EMG (IEMG) from the 3rd intercostal space was recorded during each minute of rest and hyperventilation. Two-way ANOVA with repeated measures revealed that chest wall loading and hyperpnea significantly increased V.O2 values (p < 0.01). External intercostal IEMG levels were significantly increased (p < 0.05) at higher restrictive load (50 and 75 mm Hg) and at the highest minute ventilation (90 liters/min). These data suggest that there is a significant and quantifiable increase in the oxygen cost associated with external chest wall restriction which is directly related to the level of chest wall restriction.
Authors:
J Gonzalez; J R Coast; J M Lawler; H G Welch
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  Respiration; international review of thoracic diseases     Volume:  66     ISSN:  0025-7931     ISO Abbreviation:  Respiration     Publication Date:  1999  
Date Detail:
Created Date:  1999-06-17     Completed Date:  1999-06-17     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0137356     Medline TA:  Respiration     Country:  SWITZERLAND    
Other Details:
Languages:  eng     Pagination:  188-94     Citation Subset:  IM; S    
Affiliation:
Human Performance Laboratories, Department of Health and Kinesiology, Texas A&M University, College Station, Tex., USA.
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MeSH Terms
Descriptor/Qualifier:
Adult
Analysis of Variance
Electromyography
Equipment Design
Exercise / physiology*
Humans
Immobilization / physiology*
Male
Orthotic Devices*
Oxygen Consumption / physiology*
Pulmonary Gas Exchange
Reference Values
Respiratory Function Tests
Respiratory Mechanics / physiology*
Thorax / physiology
Weight-Bearing / physiology

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


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