Document Detail

Eccentric exercise inhibits the H reflex in the middle part of the trapezius muscle.
MedLine Citation:
PMID:  22573465     Owner:  NLM     Status:  Publisher    
The objectives of this study were to (1) investigate the modulation of the H reflex immediately after and 24 h after eccentric exercise in the presence of delayed-onset muscle soreness (DOMS) and (2) test the reproducibility of the H reflex in trapezius across days. H reflexes were recorded from the dominant middle trapezius muscle by electrical stimulation of the C3/4 cervical nerve in ten healthy subjects. DOMS was induced by eccentric exercise of the dominant shoulder. H reflexes were obtained in four sessions: "24 h before", "Pre", "Post", and "24 h after" eccentric exercise. Ratios of maximal H reflex and M wave responses (H (max)/M (max)) were compared between sessions. In addition, a between session comparison was done for the ratios of H reflex amplitudes (H (i_75)/M (max), and H (i_50)/M (max)) obtained from the stimulus intensity needed to obtain 75 and 50 % of H (max) at "24 h before". No ratio changes were found when comparing "24 h before" and "Pre" recordings. A decrease in H (i_50)/M (max) was found at "Post" (P < 0.05) and decreases in both H (i_75)/M (max) and H (i_50)/M (max) were observed at "24 h after" (P < 0.05). This study presented evidence that an acceptable day-to-day reproducibility of the H reflex could be obtained with the applied experimental setup. Furthermore, immediately after and 24 h after exercise a stronger stimulus intensity was needed to reach the same magnitude of the H reflex reflecting that the recruitment curve was shifted to the right. This modulation of the stimulus-response relationship could be caused by presynaptic inhibition of Ia afferent fibres' input to the motoneuron by group III and IV afferents.
Steffen Vangsgaard; Lars T Nørgaard; Brian K Flaskager; Karen Søgaard; Janet L Taylor; Pascal Madeleine
Related Documents :
15388905 - The effect of early postoperative physical activity on tissue oxygen and wound healing.
16915105 - What is intervertebral disc degeneration, and what causes it?
11254075 - The handling and short-haul road transportation of spent buffaloes in relation to bruis...
9763165 - Effects of exercise on achilles tendon healing in a rat model.
23733645 - Exercise and muscular dystrophy: implications and analysis of effects on musculoskeleta...
6104295 - Long-term vasodilator therapy with trimazosin in chronic cardiac failure.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-5-10
Journal Detail:
Title:  European journal of applied physiology     Volume:  -     ISSN:  1439-6327     ISO Abbreviation:  -     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-5-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Health Science and Technology, Laboratory for Ergonomics and Work-related Disorders, Center for Sensory-Motor Interaction (SMI), Aalborg University, Fredrik Bajers Vej 7, Bldg. D-3, 9220, Aalborg, Denmark.
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:  Effect of interrupting prenatal Down syndrome screening due to a large nuchal translucency.
Next Document:  The SNP rs6441224 influences transcriptional activity and prognostically relevant hypermethylation o...