King Grub
2009-12-19, 10:35
PURPOSE:: To examine serum creatine kinase activity following 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-RM loads were completed for the chest press, 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: 1 min or 3 min. Following blood analysis, subjects were separated into normal responders (NR) or high responders (HR), based on 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 NR groups. For the NR group, serum CK was significantly elevated from 24h to 72h following 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 48h and 72h 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 micro-trauma.
Med Sci Sports Exerc. 2009 Dec 14. Short Recovery Augments the Magnitude of Muscle Damage in High Responders.
METHODS:: During each resistance exercise bout, three sets with 10-RM loads were completed for the chest press, 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: 1 min or 3 min. Following blood analysis, subjects were separated into normal responders (NR) or high responders (HR), based on 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 NR groups. For the NR group, serum CK was significantly elevated from 24h to 72h following 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 48h and 72h 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 micro-trauma.
Med Sci Sports Exerc. 2009 Dec 14. Short Recovery Augments the Magnitude of Muscle Damage in High Responders.