Document Detail


Noninvasive measurement of human forearm oxygen consumption by near infrared spectroscopy.
MedLine Citation:
PMID:  8375359     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study reported on the application of near infrared spectroscopy (NIRS) to noninvasive measurements of forearm brachio-radial muscle oxygen consumption (VO2) and recovery time (tr) in untrained volunteers. Seven healthy subjects were submitted to four consecutive protocols involving measurements made at rest, the induction of an ischaemia, and during a maximal increase of metabolic demand achieved with and without vascular occlusion. Two isometric maximal voluntary contractions (MVC) of 30-s duration were executed with and without vascular occlusion and a 50% MVC lasting 125 s was also performed. The protocols were repeated on 2 different days. The results showed that, during vascular occlusion at rest, the time to 95% of the final haemoglobin (Hb) + myoglobin (Mb) desaturation value was independent of VO2. The MVC, performed during vascular occlusion, caused complete Hb+Mb desaturation in 15-20 s, which was not followed by any further desaturation when the second contraction was performed. No difference was found between VO2 during MVC with and without vascular occlusion. A consistent difference was seen between VO2 measured during occlusion at rest and VO2 measured during MVC with and without occlusion. During prolonged exercise (125 s) Hb+Mb desaturation was maintained for the whole contraction period. The results of this study show that VO2 can be measured noninvasively by NIRS. The VO2 during MVC was very similar both in the presence and absence of blood flow limitation in most of the subjects tested. This would suggest that muscle VO2 might be accurately evaluated dynamically without cuff occlusion.
Authors:
R A De Blasi; M Cope; C Elwell; F Safoue; M Ferrari
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  67     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1993  
Date Detail:
Created Date:  1993-10-21     Completed Date:  1993-10-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  20-5     Citation Subset:  IM    
Affiliation:
Istituto di Anestesiologia e Rianimazione, I Università di Roma, Policlinico Umberto I, Italy.
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MeSH Terms
Descriptor/Qualifier:
Adult
Blood Vessels
Constriction
Female
Forearm
Hemoglobins / metabolism
Humans
Isometric Contraction / physiology
Male
Muscles / blood supply,  metabolism*
Myoglobin / metabolism
Oxygen Consumption*
Spectrophotometry, Infrared*
Chemical
Reg. No./Substance:
0/Hemoglobins; 0/Myoglobin

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


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