Document Detail


Metaboreceptor-mediated muscle oxygen saturation during recovery following isometric handgrip exercise.
MedLine Citation:
PMID:  18379165     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The aim of the present study was to determine whether oxygen supply to non-exercised muscle during recovery following fatiguing exercise is influenced by accumulated metabolites within exercised muscle. Twelve healthy male subjects performed 2-min isometric handgrip exercise at 40% maximal voluntary contraction with their right hand and the exercise was followed by a 3-min recovery period. Muscle oxygen saturation (SmO(2)) determined by near-infrared spatially resolved spectroscopy was used as an index of oxygen supply to non-exercised muscle and was measured in biceps brachii and tibialis anterior muscles on the left side. Compared to the pre-exercise baseline level, SmO(2) in the biceps brachii muscle (SmO(2BB)) increased significantly from 30 sec to 1 min after the start of exercise, while SmO(2) in the tibialis anterior muscle (SmO(2TA)) remained stable during the initial 1 min of exercise. Both SmO(2BB) and SmO(2TA) began to decrease at about 1 min and continued to decrease thereafter. Due to the initial increase in SmO(2BB), only SmO(2TA) showed a significant decrease during exercise. During recovery, SmO(2BB) did not differ significantly from the pre-exercise baseline level, whereas SmO(2TA) remained significantly lower until about 1.5 min of recovery and then it did not differ significantly from the baseline level. In another bout, subjects performed handgrip exercise of the same intensity, but post-exercise arterial occlusion (PEAO) of the exercised muscle was imposed for 2 min immediately after the end of exercise. During PEAO, SmO(2BB) decreased significantly compared to the baseline level, whereas SmO(2TA) remained significantly lower until the end of PEAO. The significant decrease in SmO(2BB) and the prolongation of decrease in SmO(2TA) by PEAO suggests that the recovery of SmO(2) in the non-exercised arm and leg is mediated by muscle metaboreceptors.
Authors:
Hisayoshi Ogata; Masami Akai; Kimitaka Nakazawa
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of physiological anthropology     Volume:  27     ISSN:  1880-6791     ISO Abbreviation:  -     Publication Date:  2008 Mar 
Date Detail:
Created Date:  2008-04-01     Completed Date:  2008-05-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101269653     Medline TA:  J Physiol Anthropol     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  83-91     Citation Subset:  IM    
Affiliation:
Department of Rehabilitation for Movement Functions, Research Institute of National Rehabilitation Center for Persons with Disabilities, Tokorozawa, Saitama, Japan. hisaoga@rehab.go.jp
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MeSH Terms
Descriptor/Qualifier:
Adult
Blood Pressure / physiology
Electromyography
Exercise / physiology*
Hand Strength
Heart Rate / physiology
Humans
Isometric Contraction
Male
Muscle, Skeletal / blood supply*,  metabolism*
Oxygen / blood,  metabolism*
Spectroscopy, Near-Infrared
Chemical
Reg. No./Substance:
7782-44-7/Oxygen

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


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