Document Detail

Altering the rest interval during high-intensity interval training does not affect muscle or performance adaptations.
MedLine Citation:
PMID:  22923232     Owner:  NLM     Status:  Publisher    
It has been hypothesized that exercise-induced changes in metabolites and ions are crucial in the adaptation of contracting muscle. We tested this hypothesis by comparing adaptations to two different interval-training protocols (differing only in the rest duration between intervals), which provoked different perturbations in muscle metabolites and acid-base status. Prior to and immediately after training, twelve women performed the following tests: 1) a graded exercise test to determine V*O2peak; 2) a high-intensity exercise bout (HIE) followed 60 seconds later by a repeated-sprint ability (RSA) test; and 3) a repeat of the HIE alone with muscle biopsies pre and immediately post exercise, and after 60 s of recovery. Subjects performed five weeks (3 d wk-1) of training, with either a short (1 min; HIT-1) or long rest period (3 min; HIT-3) between intervals; training intensity and volume were matched. Muscle [H+] (155 ± 15 v 125 ± 8 nmol L-1; p<0.05) and MLa content (84.2 ± 7.9 v 46.9 ± 3.1 mmol g ww-1) were both higher after HIT-1, while muscle PCr content (52.8 ± 8.3 v 63.4 ± 9.8 mmol g ww-1) was lower. There were no significant differences between the two groups for increases in V*O2peak, repeated-sprint performance, or muscle Na+,K+-ATPase content. Following training, both groups had a significant decrease in post-exercise muscle [H+] and lactate content, but not post-exercise ATP or PCr. Post-exercise PCr resynthesis increased following both training methods. In conclusion, intense interval training results in marked improvements in muscle Na+,K+-ATPase content, PCr resynthesis, and V*O2peak. However, manipulating the rest period during intense interval training did not affect these changes.
Johann Edge; Nir Eynon; Michael J McKenna; Craig A Goodman; Roger C Harris; David J Bishop
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-23
Journal Detail:
Title:  Experimental physiology     Volume:  -     ISSN:  1469-445X     ISO Abbreviation:  Exp. Physiol.     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9002940     Medline TA:  Exp Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1 Muscle Metabolism Laboratory, Department of Sport and Exercise Science, University of Auckland, Auc;
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