Document Detail

Short recovery augments magnitude of muscle damage in high responders.
MedLine Citation:
PMID:  20019640     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To examine serum creatine kinase (CK) activity after resistance exercise bouts with different rest intervals between sets and exercises in high responding (HR) and normal responding (NR) subjects. METHODS: During each resistance exercise bout, three sets with 10-repetition maximum (10RM) loads were completed for the chest press, cable pulldown, biceps curl, triceps extension, leg extension, and prone leg curl. Each bout differed in the length of the rest interval between sets and exercises, specifically either 1 or 3 min. After blood analysis, subjects were separated into NR or HR on the basis of the peak serum CK activity being in the 90th percentile. RESULTS: The volume completed (load x sets x repetitions) was significantly greater for the 3-min bout versus the 1-min bout, with no significant differences between the HR and the NR groups. For the NR group, serum CK was significantly elevated from 24 to 72 h after each bout, with no significant differences between bouts. Conversely, for the HR group, the 1-min bout resulted in serum CK activity levels that were approximately 70% greater than the 3-min bout at the 48- and 72-h time points. CONCLUSIONS: The key finding from the current study was that the HR group experienced significantly greater CK responses when using shorter rest intervals between sets. Conversely, for the NR group, CK responses were not significantly different between bouts. These findings may have implications for resistance exercise prescription in that some individuals might be less tolerant of shorter rest intervals between sets with greater skeletal muscle microtrauma.
Marco Machado; Jeffrey M Willardson
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  42     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2010 Jul 
Date Detail:
Created Date:  2010-06-24     Completed Date:  2010-10-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1370-4     Citation Subset:  IM; S    
Laboratory of Physiology and Biokinetic, Faculty of Biological Sciences and Health, Universidade Iguaçu Campus V at Itaperuna, Itaperuna, Rio de Janeiro, Brazil.
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MeSH Terms
Case-Control Studies
Creatinine / blood*
Exercise / physiology*
Muscle, Skeletal / injuries,  physiopathology*
Resistance Training / methods*
Young Adult
Reg. No./Substance:

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