Document Detail

Cerebral and muscle oxygenation changes during static and dynamic knee extensions to voluntary fatigue in healthy men and women: a near infrared spectroscopy study.
MedLine Citation:
PMID:  21029329     Owner:  NLM     Status:  In-Data-Review    
The aim of the study was to examine the changes in cerebral and muscle blood volume (Cbv, Mbv) and oxygenation (Cox, Mox) during static and dynamic knee extensions to fatigue in men (N = 10; 29 ± 9 years) and women (N = 14; 27 ± 8 years). After assessment of 1 repetition maximum (1RM) during unilateral knee extensions with the dominant limb, each subject exercised at 50%, 75% and 100% of 1 RM in random order on separate occasions. Simultaneous changes in Cbv, Cox, Mbv and Mox from the contralateral prefrontal lobe and the dominant limb were measured by near infrared spectroscopy. During all three contractions, Cbv and Cox increased while Mbv and Mox decreased until fatigue in both genders. There were no signs of levelling off or decline in Cbv and Cox during any of these contractions, implying that there was no reduction in cerebral neuronal activation. Conversely, there was a rapid decline in Mbv and Mox during the early stages of the contractions, with a plateau or slight increase towards the end. The respective delta values at 50%, 75% and 100% of 1RM for Cbv (0·088 versus 0·062 versus 0·070), Cox (0·042 versus 0·033 versus 0·038), Mbv (-0·225 versus -0·198 versus -0·196), and Mox (-0·169 versus -0·146 versus -0·158) were not significantly different in the total group (N = 24). These findings suggest that fatigue during resistance exercise lasting up to 60 s is mediated peripherally because of reduced blood volume and oxygen availability and is independent of the type and intensity of muscle contraction and gender.
Cristiane Matsuura; Paulo S C Gomes; Mark Haykowsky; Yagesh Bhambhani
Related Documents :
9923729 - The duration of predicting trials influences time to fatigue at critical power.
9562299 - Effects of contraction duration on low-frequency fatigue in voluntary and electrically ...
11908559 - Aerobic fitness, fatigue, and physical disability in systemic lupus erythematosus.
8140219 - Hyperventilation and chronic fatigue syndrome.
20447719 - Loss of capacity to recover from acidosis in repeat exercise is strongly associated wit...
9558019 - Chronic fatigue syndrome: a literature review from a physiatric perspective.
3319209 - Application of modalities in overuse syndromes.
15831059 - The science of cycling: physiology and training - part 1.
22785489 - Increased stearoyl-coa desaturase index and triglyceride content in the liver of rats a...
Publication Detail:
Type:  Journal Article     Date:  2010-10-28
Journal Detail:
Title:  Clinical physiology and functional imaging     Volume:  31     ISSN:  1475-097X     ISO Abbreviation:  Clin Physiol Funct Imaging     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-02-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101137604     Medline TA:  Clin Physiol Funct Imaging     Country:  England    
Other Details:
Languages:  eng     Pagination:  114-23     Citation Subset:  IM    
Copyright Information:
© 2010 The Authors. Clinical Physiology and Functional Imaging © 2010 Scandinavian Society of Clinical Physiology and Nuclear Medicine.
Escola de Educação Física do Exército, Exército Brasileiro, Rio de Janeiro, Brazil Laboratório Crossbridges, Programa de Pós-graduação em Educação Física, Universidade Gama Filho, Rio de Janeiro, Brazil Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, AB, Canada.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

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

Previous Document:  The ?-MSH analogue AP214 attenuates rise in pulmonary pressure and fall in ejection fraction in lipo...
Next Document:  Unusual cause of biliary colic in a Swiss farmer.