Document Detail

Changes in agonist EMG activation level during MVC cannot explain early strength improvement.
MedLine Citation:
PMID:  15918059     Owner:  NLM     Status:  MEDLINE    
A substantial gain in strength is often observed in the early phase of resistance training. The aim of this study was to address whether improved strength in the early phase of resistance training, can be attributed to increased activation, or to intra-muscular changes of the agonist muscle during maximal isometric torque production. Fourteen male subjects trained maximal isometric dorsiflexion during 5 days. Each subject performed 9 sessions with 25 maximal voluntary contractions in a device that registered the dorsiflexion torque. Surface electromyography (SEMG) of the tibialis anterior (TA) was recorded with a 130-channel grid electrode. SEMG of the extensor digitorum longus, gastrocnemius and soleus muscles were recorded with bipolar electrodes. The main finding was that all subjects gained in strength while the SEMG activation level of the primer agonist, TA, decreased with no apparent intra-muscular spatial changes following 5 days of resistance training. The other muscles that influence dorsiflexion torque did not modify their activation level with training. These findings reject an increase in agonist activation level as the main source for early strength gain, and illustrate the need for further research to reveal the specific sites of neural adaptation and other physiological mechanisms that might contribute to increased strength during the early phase of resistance training.
Andreas Holtermann; Karin Roeleveld; Beatrix Vereijken; Gertjan Ettema
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Publication Detail:
Type:  Clinical Trial; Journal Article     Date:  2005-05-26
Journal Detail:
Title:  European journal of applied physiology     Volume:  94     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2005 Aug 
Date Detail:
Created Date:  2005-07-26     Completed Date:  2005-10-20     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  593-601     Citation Subset:  IM    
Human Movement Sciences Program, Faculty of Social Sciences and Technology Management, Norwegian University of Science and Technology (NTNU), Dragvoll Idrettssenter, 7491 Trondheim, Norway.
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MeSH Terms
Adaptation, Physiological
Ankle Joint / physiology
Electromyography / methods*
Exercise / physiology*
Muscle Contraction / physiology*
Muscle, Skeletal / physiology*
Physical Endurance / physiology*
Physical Fitness / physiology*
Postural Balance / physiology*

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