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| Research article summary (published 30 Aug 2002): |
Is muscle power related to running speed with changes of direction?
Full Abstract
BACKGROUND:
The purpose of this study was to identify the relationships between leg muscle power and sprinting speed with changes of direction.
METHODS:
EXPERIMENTAL
DESIGN:
the study was designed to describe relationships between physical qualities and a component of sports performance.
SETTING:
testing was conducted in an indoor sports hall and a biomechanics laboratory.
PARTICIPANTS:
15 male participants were required to be free of injury and have recent experience competing in sports involving sprints with changes of direction.
MEASURES:
subjects were timed in 8 m sprints in a straight line and with various changes of direction. They were also tested for bilateral and unilateral leg extensor muscle concentric power output by an isokinetic squat and reactive strength by a drop jump.
RESULTS:
The correlations between concentric power and straight sprinting speed were non-significant whereas the relationships between reactive strength and straight speed were statistically significant. Correlations between muscle power and speed while changing direction were generally low and non-significant for concentric leg power with some moderate and significant (p<0.05) coefficients found for reactive strength. The participants who turned faster to one side tended to have a reactive strength dominance in the leg responsible for the push-off action.
CONCLUSIONS:
The relationships between leg muscle power and change-of-direction speed were not consistent. Reactive strength as measured by the drop jump appears to have some importance for lateral change-of-direction speed, possibly because of similar push-off actions. It was concluded that reactive strength of the leg extensor muscles has some importance in change-of-direction performance but the other technical and perceptual factors than influence agility performance should also be considered.
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Author information
Author/s: Young, W B (WB); James, R (R); Montgomery, I (I);
Affiliation: School of Human Movement and Sport Sciences, University of Ballarat, Ballarat, Victoria, Australia. w.young(-atsign-)ballarat.edu.au
Journal and publication information
Publication Type: Journal Article
Journal: The Journal of sports medicine and physical fitness (J Sports Med Phys Fitness), published in Italy. (Language: eng)
Reference: 2002-Sep; vol 42 (issue 3) : pp 282-8
Dates: Created 2002/07/02; Completed 2002/12/09; Revised 2004/11/17;
PMID: 12094116, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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