Document Detail

A new instrument for the measurement of rib cage and abdomen circumference variation in respiration at rest and during exercise.
MedLine Citation:
PMID:  7588698     Owner:  NLM     Status:  MEDLINE    
A simple and inexpensive new extensometer for measuring changes in chest wall circumference during human respiratory movements is presented. The instrument detects the delay between ultrasound emission and reception at opposite ends of two rubber tubes encircling the rib cage and abdomen. Assuming a two degree of freedom model of the chest wall and employing an isovolume procedure for determination of volume-motion coefficients, extensometer estimation of tidal volume (VT) from changes of rib cage and abdomen circumference was compared with spirometer measurements at rest and during exercise on a cycle ergometer (55-155 W) in six subjects and, in four of them, on a treadmill (4-12 km.h-1). In three subjects hypercapnic hyperpnoea at rest was also studied. The slopes of the linear relationship between extensometer and spirometer VT (litres) averaged 0.9967 (SD 0.0117) (r2 = 0.995-0.998; n = 90-143) for cycle ergometer exercise, 1.0072 (SD 0.0078) (r2 = 0.991-0.998; n = 75-93) for treadmill exercise and 0.9942 (SD 0.0188) (r2 = 0.997-0.998; n = 18-25) for hypercapnic hyperpnoea. In all instances the slope of the regression line was consistent with the model of the identity line (slope = 1). The changes in end-expiratory lung volume between respiration at rest and during exercise were determined by the extensometers, and were nearly identical (98.4% on average) to those measured with the spirometer (r2 = 0.945; n = 24). It is concluded that determination of chest wall circumference with this new instrument is suitable for quantitative measurement of ventilation and lung volume variations in humans under most physiological conditions.
C L Lafortuna; L Passerini
Related Documents :
6777348 - Diaphragmatic emg and occlusion pressure response to elastic loading during co2 rebreat...
21125058 - Should practitioners promote physical activity as a treatment for depression?
11112138 - Noninvasive assessment of inspiratory muscle function during exercise.
10392278 - A centrifugal pump driven tidal flow extracorporeal membrane oxygenation system tested ...
18339008 - Severe aseptic inflammation caused by long distance running (246 km) does not increase ...
11053328 - Skeletal muscle metabolic and ionic adaptations during intense exercise following sprin...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  71     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1995  
Date Detail:
Created Date:  1995-12-13     Completed Date:  1995-12-13     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  259-65     Citation Subset:  IM; S    
Istituto di Tecnologie Biomediche Avanzate del C.N.R., Reparto di Fisiologia del Lavoro Muscolare, Milan, Italy.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Equipment Design
Exercise Test
Hypercapnia / physiopathology
Hyperventilation / physiopathology
Middle Aged
Physical Exertion*
Physiology / instrumentation*
Respiration / physiology*
Thorax / physiology*

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

Previous Document:  Hyperoxia during recovery from consecutive anaerobic exercises in the sickle cell trait.
Next Document:  Effects of moisture absorption by clothing on thermal responses during intermittent exercise at 24 d...