Document Detail


The influence of circulatory difference on muscle oxygenation and fatigue during intermittent static dorsiflexion.
MedLine Citation:
PMID:  14704798     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study aimed to examine the influences of circulatory difference on the utilization of O(2) and the progression of fatigue in the tibialis anterior (TA) muscle during dorsiflexion exercise, with reference to different body postures. The subjects performed intermittent static dorsiflexion at 50% of maximal voluntary contraction (MVC) up to exhaustion with the right leg either up or down relative to the heart. These exercises were performed with and without occluding muscle blood flow. Simultaneously with the surface electromyogram (EMG) measurement, total hemoglobin volume change and tissue oxygenation ( S(t)O(2)) of TA were measured using near-infrared spectroscopy (NIRS). When the subjects performed an exhaustive intermittent dorsiflexion exercise at 50% MVC, the endurance time decreased in the leg up position. Also, the progression of fatigue in TA detected using EMG signals (i.e. integrated EMG and mean power frequency of EMG) was faster with the leg elevated. The NIRS data indicated a lower blood volume and S(t)O(2) with the leg up than with the leg down during the exercise, which suggests that the deficit in the O(2) supply to exercising muscle's demand was more apparent in the leg up position. However, these differences in EMG and NIRS data disappeared when the blood flow was restricted in both positions. From these results it is concluded that the difference in exercising muscle oxygenation between two different body postures influenced the progression of muscle fatigue and caused the difference in endurance performance.
Authors:
Masanobu Tachi; Motoki Kouzaki; Hiroaki Kanehisa; Tetsuo Fukunaga
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Controlled Clinical Trial; Journal Article; Randomized Controlled Trial     Date:  2003-12-24
Journal Detail:
Title:  European journal of applied physiology     Volume:  91     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2004 May 
Date Detail:
Created Date:  2004-04-16     Completed Date:  2004-11-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  682-8     Citation Subset:  IM    
Affiliation:
Department of Life Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo, Japan 153-8902.
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological / physiology
Adult
Electromyography
Humans
Male
Muscle Contraction / physiology*
Muscle Fatigue / physiology*
Muscle, Skeletal / blood supply*,  physiology*
Oxygen Consumption / physiology*
Physical Endurance / physiology*
Posture / physiology*
Supine Position

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


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