Document Detail

Vastus lateralis oxygenation dynamics during maximal fatiguing concentric and eccentric isokinetic muscle actions.
MedLine Citation:
PMID:  21256047     Owner:  NLM     Status:  Publisher    
The present study aimed to assess whether high intensity exhaustive eccentric (ECC) exercise was associated with a greater decrease in muscle oxygenation compared to high intensity exhaustive concentric (CON) exercise during maximal isokinetic knee extensions. On two separate days, ten recreationally active participants performed maximal isokinetic concentric (KE(CON)) and eccentric (KE(ECC)) knee extension exercises at 60°s(-1) until exhaustion. Muscle oxygenation profile and activity were acquired continuously from the vastus lateralis (VL) muscle using near-infrared spectroscopy, along with surface electromyography (sEMG). The torque output was significantly greater during KE(ECC) (P<0.01). Total time to exhaustion was longer in ECC condition (P<0.01). The decrease in tissue oxygenation index observed between the beginning and end-exercise values was significantly greater during KE(ECC) than during KE(CON) (P<0.05) while total haemoglobin volume did not differ significantly. KE(ECC) resulted in a significant increase in end-exercise integrated sEMG (P<0.05). We propose that the associated higher intramuscular pressure may have compressed blood vessels and led to a greater decrease in tissue oxygenation index. The observed end-exercise increase in neural drive during KE(ECC) may have occurred to prevent from muscle performance decrease. These results suggest that, over time, repeated maximal ECC actions induce a greater O(2) extraction compared to maximal CON actions.
Romain Denis; Aurélien Bringard; Stéphane Perrey
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-1-19
Journal Detail:
Title:  Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology     Volume:  -     ISSN:  1873-5711     ISO Abbreviation:  -     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-1-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9109125     Medline TA:  J Electromyogr Kinesiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2010 Elsevier Ltd. All rights reserved.
Institute for Sport and Health, University College Dublin, Dublin 4, Ireland.
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