Document Detail


Enhanced H-reflex with resistance training is related to increased rate of force development.
MedLine Citation:
PMID:  17602237     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Parallel increases in strength and rate of force development (RFD) are well-known outcomes from the initial phase of resistance training. However, it is unknown whether neural adaptations with training contribute to improvements of both factors. The aim of this study was to examine whether changes in H-reflex amplitude with resistance training can explain the gain in strength or rather be associated with RFD. Twelve subjects carried out 3 weeks of isometric maximal plantarflexion training, whereas 12 subjects functioned as controls. H-reflexes were elicited in the soleus muscle during rest and sub-maximal contractions at 20 and 60% of maximal voluntary contraction (MVC). In addition, surface electromyography (sEMG) was recorded from the soleus, gastrocnemius and tibialis anterior muscles during MVC. The resistance training provided increases in maximal force of 18%, RFD of 28% and H-reflex amplitude during voluntary contractions of 17 and 15% while no changes occurred in the control group. In contrast, the maximal M-wave, the maximal H-reflex to maximal M-wave ratio during rest and sEMG during MVC did not change with training. There was a positive correlation between percentage changes in H-reflex amplitude and RFD with training (r = 0.59), while significant association between percentage changes in H-reflex amplitude and maximal force was not found. These findings indicate the occurrence of changed motoneuron excitability or presynaptic inhibition during the initial phase of resistance training. This is the first study to document that increased RFD with resistance training is associated with changes in reflex excitability.
Authors:
Andreas Holtermann; Karin Roeleveld; Morten Engstrøm; Trond Sand
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Publication Detail:
Type:  Journal Article     Date:  2007-06-30
Journal Detail:
Title:  European journal of applied physiology     Volume:  101     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2007 Oct 
Date Detail:
Created Date:  2007-09-06     Completed Date:  2008-01-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  301-12     Citation Subset:  IM    
Affiliation:
Human Movement Sciences Programme, Norwegian University of Science and Technology, Trondheim, Norway. andreas.holtermann@svt.ntnu.no
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological
Electromyography
Evoked Potentials
Exercise*
H-Reflex / physiology*
Humans
Isometric Contraction
Male
Weight Lifting*

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


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