Document Detail


The contribution of volume, technique, and load to single-repetition and total-repetition kinematics and kinetics in response to three loading schemes.
MedLine Citation:
PMID:  18841079     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study examined the effect of volume, technique, and load upon single-repetition and total-repetition kinematics and kinetics during three loading schemes. Eleven recreationally trained males each performed a power (8 sets of 6 repetitions at 45% of one-repetition maximum [1RM], 3-minute rest periods, explosive and ballistic movements), hypertrophy (10 sets of 10 repetitions at 75% 1RM, 2-minute rest periods, controlled movements), and maximal strength (6 sets of 4 repetitions at 88% 1RM, 4-minute rest periods, explosive intent) scheme involving squats. Examination of repetition data showed that load intensity (% 1RM) generally had a direct effect on forces, contraction times, impulses, and work (i.e., increasing with load), whereas power varied across loads (p < 0.001). However, total-repetition forces, contraction times, impulses, work, and power were all greater in the hypertrophy scheme (p < 0.001), because of the greater number of repetitions performed (volume) as well as lifting technique. No differences in total forces were found between the equal-volume power and maximal strength schemes, but the former did produce greater total contraction times, work, and power (p < 0.001), which may also be attributed to repetition and technique differences. Total impulses were the only variable greater in the maximal strength scheme (p < 0.001). Thus, the interaction of load, volume, and technique plays an important role in determining the mechanical responses (stimuli) afforded by these workouts. These findings may explain disparities cited within research, regarding the effectiveness of different loading strategies for hypertrophy, maximal strength, and power adaptation.
Authors:
Blair T Crewther; John Cronin; Justin W L Keogh
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Publication Detail:
Type:  Comparative Study; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  22     ISSN:  1533-4287     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2008 Nov 
Date Detail:
Created Date:  2008-11-07     Completed Date:  2009-03-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1908-15     Citation Subset:  IM    
Affiliation:
The Horticulture and Food Research Institute of New Zealand (HortResearch), Auckland, New Zealand. BCrewther@Hortresearch.co.nz
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MeSH Terms
Descriptor/Qualifier:
Adult
Biomechanics
Humans
Hypertrophy
Kinetics
Leg
Male
Muscle Contraction / physiology*
Muscle Development / physiology*
Muscle Strength / physiology
Physical Endurance / physiology
Resistance Training / instrumentation,  methods*
Weight Lifting / physiology*
Weight-Bearing*

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


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