Document Detail


Validity of NIR spectroscopy for quantitatively measuring muscle oxidative metabolic rate in exercise.
MedLine Citation:
PMID:  11133927     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this study was to examine the validity of the quantitative measurement of muscle oxidative metabolism in exercise by near-infrared continuous-wave spectroscopy (NIRcws). Twelve male subjects performed two bouts of dynamic handgrip exercise, once for the NIRcws measurement and once for the (31)P-magnetic resonance spectroscopy (MRS) measurement as a standard measure. The resting muscle metabolic rate (RMRmus) was independently measured by (31)P-MRS during 15 min of arterial occlusion at rest. During the first exercise bout, the quantitative value of muscle oxidative metabolic rate at 30 s postexercise was evaluated from the ratio of the rate of oxyhemoglobin/myoglobin decline measured by NIRcws during arterial occlusion 30 s after exercise and the rate at rest. Therefore, the absolute values of muscle oxidative metabolic rate at 30 s after exercise [VO(2NIR(30))] was calculated from this ratio multiplied by RMRmus. During the second exercise bout, creatine phosphate (PCr) resynthesis rate was measured by (31)P-MRS at 30 s postexercise [Q((30))] under the same conditions but without arterial occlusion postexercise. To determine the validity of NIRcws, VO(2NIR(30)) was compared with Q((30)). There was a significant correlation between VO(2NIR(30)), which ranged between 0.018 and 0. 187 mM ATP/s, and Q((30)), which ranged between 0.041 and 0.209 mM ATP/s (r = 0.965, P < 0.001). This result supports the application of NIRcws to quantitatively evaluate muscle oxidative metabolic rate in exercise.
Authors:
T Sako; T Hamaoka; H Higuchi; Y Kurosawa; T Katsumura
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Publication Detail:
Type:  Journal Article; Validation Studies    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  90     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2001 Jan 
Date Detail:
Created Date:  2001-01-16     Completed Date:  2001-03-29     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  338-44     Citation Subset:  IM    
Affiliation:
Department of Preventive Medicine and Public Health, Tokyo Medical University, Shinjuku-ku, Tokyo 160-8402, Japan. sako@tokyo-med.ac.jp
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MeSH Terms
Descriptor/Qualifier:
Adenosine Triphosphate / metabolism
Adult
Exercise / physiology*
Humans
Magnetic Resonance Spectroscopy
Male
Muscle, Skeletal / metabolism*
Myoglobin / metabolism
Oxygen Consumption*
Oxyhemoglobins / metabolism
Phosphocreatine / biosynthesis
Phosphorus
Rest / physiology
Spectroscopy, Near-Infrared / standards*
Time Factors
Chemical
Reg. No./Substance:
0/Myoglobin; 0/Oxyhemoglobins; 56-65-5/Adenosine Triphosphate; 67-07-2/Phosphocreatine; 7723-14-0/Phosphorus

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