Document Detail


Effects of Carbohydrate Supplementation on Force Output and Time to Exhaustion during Static Leg Contractions Superimposed with Electromyostimulation: Exercise Physiology Laboratory.
MedLine Citation:
PMID:  21912287     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The purpose of this study was to investigate the effects of carbohydrate ingestion on force output and time to exhaustion using single leg static contractions superimposed with brief periods of electromyostimulation. Six trained male subjects participated in a randomized, counterbalanced, double blind study. Subjects were randomly assigned to placebo (PL) or carbohydrate (CHO). Subjects in CHO consumed 1 g carbohydrate·kg body mass loading dose and 0.17 g carbohydrate·kg body mass every six min during the exercise protocol. PL received an equal volume of a solution made of saccharin/aspartame. The exercise protocol consisted of repeated 20 s static contractions of quadriceps muscle at 50% maximal voluntary contraction followed by 40 s rest until failure occurred. Importantly, the force output during quadriceps maximal voluntary contraction strength with superimposed electromyostimulation was measured in the beginning and every 5 min during the last 3 s of static contractions throughout the exercise protocol. Venous blood samples were taken pre-, immediately post-, and at 5 min post- exercise and analyzed for blood lactate. Our results indicate that time to exhaustion (PL = 16.0 ± 8.1 min; CHO = 29.0 ± 13.1 min) and force output (PL = 3638.7 ± 524.5 N; CHO = 5540.1 ± 726.1 N) were significantly higher (p < 0.05) in CHO compared to PL. Data suggest that carbohydrate ingestion prior to and during static muscle contractions can increase force output and increase time to exhaustion. Therefore, our data suggest that carbohydrate supplementation prior to and during resistance exercise might help increase the training volume of athletes.
Authors:
Benjamin Wax; Stanley P Brown; Heather E Webb; Andreas N Kavazis; Steve Kinzey
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-9-09
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  -     ISSN:  1533-4287     ISO Abbreviation:  -     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-9-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1Department of Kinesiology, Mississippi State University; 2Department of Kinesiology, California State University-San Bernadino.
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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