Document Detail


Vitamin and mineral supplementation and neuromuscular recovery after a running race.
MedLine Citation:
PMID:  17146317     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: This double-blind study investigated the effects of vitamin and mineral complex supplementation on the neuromuscular function of the knee-extensor muscles after a prolonged trail running race. METHODS: Twenty-two well-trained endurance runners took either placebo (Pl group) or vitamins and minerals (Vm group) for 21 d before the race and for 2 d after the race. Maximal voluntary contractions (MVC) and surface EMG activity of the vastus lateralis (VL) muscle were recorded before (pre) and 1 h (post), 24 h (post 24) and 48 h (post 48) after the race. Central activation ratio (CAR), neural (M-wave), and contractile (muscular twitch) properties of the quadriceps muscles were analyzed using electrical stimulation techniques. RESULTS: The knee-extensor MVC was significantly (P < 0.01) reduced after exercise for both groups (Vm: 36.5 +/- 3.0 %; Pl: 36.9 +/- 2.1%), but MVC recovery was greater for Vm than Pl after 48 h (11%, P < 0.05). The reduced MVC after exercise was associated with a significant reduction in maximal EMG normalized to the M-wave in VL muscle and in CAR for both groups. Characteristics of the muscular twitch were not significantly altered for either groups, whereas M-wave duration increased significantly (P < 0.05) after exercise. CONCLUSIONS: The reduction of MVC immediately after the race appeared to result from peripheral mechanisms such as a failure in muscle membrane excitation and, to a lesser extent, from reduced central activation. The cause of the depressed MVC 24 h after the race seemed to be located within the muscle itself. A dietary supplementation of a vitamin and mineral complex does not attenuate the loss of contractile function immediately after the running exercise, and it may accelerate the recovery of maximal force capacity.
Authors:
Elodie Gauche; Romuald Lepers; Giuseppe Rabita; Jean-Michel Leveque; David Bishop; Jeanick Brisswalter; Christophe Hausswirth
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  38     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2006 Dec 
Date Detail:
Created Date:  2006-12-05     Completed Date:  2007-01-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2110-7     Citation Subset:  IM; S    
Affiliation:
Laboratory of Biomechanics and Physiology, National Institute of the Sport and Physical Education, Paris, France.
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MeSH Terms
Descriptor/Qualifier:
Adult
Dietary Supplements*
Double-Blind Method
Electromyography
Humans
Muscle Contraction / drug effects,  physiology
Muscle Strength / drug effects,  physiology
Recovery of Function / drug effects*,  physiology
Running / physiology*
Trace Elements / pharmacology*
Vitamins / pharmacology*
Chemical
Reg. No./Substance:
0/Trace Elements; 0/Vitamins

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


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